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User Manual - Schulz Electronic GmbH

1. X ABCDEFGHIJK VWXY M N O P Q R S gt T gt U A 100 M 6 B 94 N 4 5 C 85 71 O 13 5 D 65 39 P 15 8 E 62 82 Q 19 F 55 26 R 27 G 45 7 S 169 H 32 37 T 174 I 26 U 180 J 17 V 31 73 K 6 W 43 8 L 6 X 55 86 Y 67 93 17 Pic LAS FOCUSSING POWER TO THE POINT Controlling the LDP QCW using a PLB 21 To control the LDP QCW with a PLB 21 it must be connected via the enclosed cable The PLB 21 will not work if USB and PLB 21 are connected at the same time When the PLB 21 is connected the first time to a LDP QCW you are asked to download a new driver This must be confirmed with yes for working the PLB 21 properly Menu Structure The following diagram shows the structure of the PLB 21 menu which affects the LDP QCW All entries are described in detail All other menu entries are described in the PLB 21 manual For detailed instructions see the PLB 21 manual Menu root Pulseparameter o Width o Reprate o Cur int ext Config o Mode o Cur stp o OverCur Trigger o Input o Edge o Count Defaults o Autoload o Save o Load Temperature o Off o Templ o Temp2 o Temp3 o Temp4 Regler o Delay o o Fw o Voltage Regler2 o P 18 Pic LAS FOCUSSING POWER TO THE POINT Pulseparameter Width This value defines the pulse width of the internal trigger generator When the value reads external the internal generator is not used Reprate This value defines
2. GETERROR Returns the content of the error register 32bit For a detailed description of the single bits see chapter description of the ERROR register GETWIDTH Returns the current pulse width of the internal pulse generator GETWIDTHMIN Returns the minimum possible pulse width of the internal pulse generator The value is measured in us GETWIDTHMAX Returns the maximum possible pulse width of the internal pulse generator This value depends of the current repetition rate Hence any change in the repetition rate changes this value too It is measured in us SETWIDTH Sets the pulse width of the internal pulse generator to the given value It must be within the borders defined by GETWIDTHMIN and GETWIDTHMAX The value is measured in us GETREPRATE Returns the current repetition rate of the internal pulse generator The value is measured in Hz GETREPRATEMIN Returns the minimum possible repetition rate of the internal pulse generator The value is measured in Hz 35 Pic LAS FOCUSSING POWER TO THE POINT GETREPRATEMAX Returns the maximum possible repetition rate of the internal pulse generator This value depends of the current pulse width Hence any change in the pulse width changes this value too It is measured in Hz SETREPRATE Sets the repetition rate of the internal pulse generator to the given value It must be within the borders defined by GETREPRATEMIN and GETREPRATEMAX The value is meas
3. GETADCPULSSAMPLES OxC7 0 Ox1CO see below GETADCPULSIDIODE 0xC8 see below Ox1CO output current in A GETADCPULSUDIODE OxC9 see below Ox1CO output voltage in 1 10V GETADCPULSVCAP OxCA see below 0x1CO capacitor voltage in 1 10V GETADCPULSI OxCB see below Ox1CO see below GETADCPULSP OxCC see below Ox1CO see below 34 Pic LAS FOCUSSING POWER TO THE POINT Description of the Individual Commands GETTEMP Returns the maximum of the GETTEMP1 GETTEMP4 commands The value is encoded as a signed integer 16bit measured in steps of 0 1 C GETTEMP1 4 Returns the measured value of the according temperature sensor The value is encoded as a signed integer 16bit measured in steps of 0 1 C GETTEMPOFF Returns the temperature border at which the device shuts down automatically The value is encoded as a signed integer 16bit measured in steps of 0 1 C GETTEMPHYS Returns the temperature to which the device must cool down until it can be switched on again The value is encoded as a signed integer 16bit measured in steps of 0 1 C GETLSTAT Returns the content of the laser status register 32bit For a detailed description of the single bits see chapter description of the LSTAT register SETLSTAT Sets the laser status register to the given value The return value contains the acquired register content For a detailed description of the single bits see chapter description of the LSTAT register
4. Pic LAS yea User Manual LDP QCW 300 12 Your distributor Schulz Y Electronic Schulz Electronic GmbH Dr Rudolf Eberle Strafte 2 D 76534 Baden Baden Fon 49 7223 9636 30 Fax 49 7223 9636 90 vertrieb schulzzet ctronic de www schulzzet ctronic de PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology KaiserstraBe 100 52134 Herzogenrath Tel 49 0 2407 563 58 0 Fax 49 0 2407 563 58 29 E Mail info picolas de Web www picolas de Pic LAS FOCUSSING POWER TO THE POINT Table of Contents LE P2Q CW p EET 1 Elei EE 2 How to se the Manual rrt Ri eui net td pes ede tse n nest pa etd itte 3 How to get started refer to drawings on next 2 pages sesseisissisissiesieriisrittrsrirtinrinrnrern 4 Description of available Connectors ssssssssssssssseseee eene tnn 5 Interface Speciticatlons s ire te ptc p ete ne iue enit Pr leet edet ac i dee sans 6 Dos and DON tSiria UEM 8 F rictional DescriptlOm cedro rdi repete a e Or a E O a Ta 9 THQ GER MODES M 10 REG WACO EDT 13 ED COGS eerte ente a senio dues ies a to T Mi et canto ctt 14 Eemer DE 15 even 15 34 Ev lo P 15 Over Temperature Sbutdown eene nene nennen nennt rnnt Enner nea 16 Absolute Maximum Rating 16 Mechanical Dimensioris e ore E eee pe Leid titu pu u
5. drawings on next 2 pages Step What to do Check 1 Unpack your device and place it in front of you as shown on the next page 2 Connect a load for example your laser diode Make sure to use both anode to the output and cathode connectors in parallel 3 Connect the PLB 21 or the USB cable A driver is required in order to use the LDP QCW with a PC See chapter Controlling the LDP QCW via USB for more information 4 Connect the input power supply make sure Make sure that your power that polarity is correct The supply voltage must A supply does not have any be at least 24 V and about 5 V above the voltage overshoots when desired capacitor bank voltage switching on or off Do not exceed the maximum operating voltage of 48 V 5 Switch the power supply on 6 If a PLB 21 is used its display may show a See chapter Controlling the LDP QCW message about downloading a new driver using a PLB 21 for more information Confirm this with YES 7 Set all required parameters using the PLB 21 or See chapter Controlling the LDP QCW USB interface using a PLB 21 for more information 8 Apply 5V to the MasterEnable pin of the BOB See chapter Interface specifications connector for more information 9 Apply 5V to the Enable pin of the BOB See chapter Interface specifications connector This will enable the output for more information 10 Monitor the current pulses using an See chapter Interface specifications oscilloscope c
6. in us swidth width in us sets the pulse width of the internal pulse generator Please note that any change in this register affects the maximum possible repetition rate The return value is the new pulse width greprate returns the actual repetition rate of the internal pulse generator in Hz grepratemin returns the minimum possible repetition rate of the internal pulse generator in Hz grepratemax returns the maximum possible pulse width of the internal pulse generator in Hz sreprate repetition rate in Hz sets the repetition rate of the internal pulse generator Please note that any change in this register affects the maximum possible pulse width The return value is the new repetition rate gcount returns the number of pulses per trigger event Only valid if counting is enabled See chapter Trigger modes for more information gcountmin returns the minimum number of pulses generated per trigger event 25 Pic LAS FOCUSSING POWER TO THE POINT Command Parameter Description gcountmax returns the minimum number of pulses generated per trigger event scount number of pulses sets the number of pulses generated per trigger event Only valid when counting mode is enabled See chapter Trigger modes for more information gffwd returns the actual voltage of the feed forward part of the current regulat
7. operation this part is not used and can be set to zero If this value is too high it may lead to a current overshoot The I value defines the strength of the integral part of the current regulator This value ranges from 0 to 4095 A recommended value for normal operation is 30 60 If this value is too high it may lead to a current overshoot PicoLAS implemented an active nonlinearity compensation of the output stage This speeds up the device prevents excessive current overshoots and yields a better accuracy with high impedance loads The influence of this part of the regulator can be user defined and is called FFwd However the interconnection between the voltage and the current flow on the output is calibrated during fabrication This is used in operating mode 1 So it is not necessary to change this value at all If needed it can be adjusted between the values O to 7 5 by the customer Be careful if changes are performed with the FFwd value The effect is high and may cause A damage if not adjusted properly Wrong settings are not covered by warranty Mode 0 manual In this operation mode all parameters can be modified This mode is recommended only for experienced users as any wrong setting may lead to a current overshoot at the output Mode 1 semi auto In this operation mode the feed forward value is automatically chosen in dependence of the current setpoint This is recommended for normal operation as it guarantees no current
8. part of the current regulator gpmin returns the minimum strength of the proportional part of the current regulator 26 Pic LAS FOCUSSING POWER TO THE POINT gpmax returns the maximum strength of the proportional part of the current regulator sp value sets the strength of the proportional part of the current regulator to the given value gvcap returns the actual pre charge voltage of the internal capacitor bank in V gvcapmin returns the minimum pre charge voltage of the internal capacitor bank in V gvcapmax returns the maximum pre charge voltage of the internal capacitor bank in V Svcap voltage in V sets the pre charge voltage of the internal capacitor bank to the given value in V One position after decimal point is used e g 12 5 gidelay returns the delay value to witch the output current must rise before the integral part of the current regulator is switched on This value is measured in percent of the set point current gidelaymin returns the minimum i delay value gidelaymax returns the maximum i delay value sidelay delay in 96 sets the delay value to witch the output current must rise before the integral part of the current regulator is switched on to the given value This value is measured in percent of the set point current 27 Pic LAS FOCUSSING POWER TO THE POINT If an Error Occurs If an error occurs during op
9. value Mode 0 manual Mode 1 semi automatic See chapter current regulator for more information 24 Pic LAS FOCUSSING POWER TO THE POINT Command Parameter Description gisoll returns the actual setpoint current in A gisollmin returns the minimum setpoint current gisollmax returns the maximum setpoint current sisoll current in A sets the internal setpoint current to the given value This value must be within the minimum maximum borders See above The return value is the new setpoint gtemp returns the actual device temperature in C This is the maximum of the single temperature sensors gtemp1 returns the value of temp sensor number 1 in C gtemp2 returns the value of temp sensor number 2 in C gtemp3 returns the value of temp sensor number 3 in C gtemp4 returns the value of temp sensor number 4 in C gtemphys returns the temperature at witch the device switches back on after an over temperature shutdown in C gtempwarn returns the temperature at witch the TEMP WARN bit in the ERROR register is set gtempoff returns the over temperature shutdown value in C gwidth returns the actual pulse width of the internal pulse generator in us gwidthmin returns the minimum possible pulse width of the internal pulse generator in us gwidthmax returns the maximum possible pulse width of the internal pulse generator
10. version number gswver returns the software version number gserial returns the serial number gname returns the device name ps prints out all settings loaddef load default values savedef save all settings as default values enautodef enables the automatic loading of default settings on power on disautodef disables the automatic loading of default settings on power on gerrtxt returns the error register in text form gerr returns the error register as a 32bin number glstat returns the laser status register slstat 32bit number sets the laser status register to the given value gtrgmode returns the actual trigger mode See below for more information strgmode mode sets the trigger mode to the given value See below for more information The return value is the new mode gtrgcount returns O if counting is disabled or 1 if enabled strgcount Oor1 enabled 1 or disables 0 the counting mode gtrgedge returns O for negative edge or 1 for positive edge strgedge Dor sets the trigger edge for external trigger 0 negative 1 positive lon enabled the output needed after any change in trigger modes loff disables the output curint switches to internal current set point curext switches to external current set point gmode returns the current regulator mode Mode 0 manual Mode 1 semi automatic See chapter current regulator for more information smode 0 2 sets the current regulator mode to the given
11. 0x10 0 0x110 32bit number SETLSTAT Ox11 32bit number 0x110 32bit number GETERROR 0x20 0 0x120 32bit number GETWIDTH 0x30 0 0x130 width in us GETWIDTHMIN 0x31 0 0x130 minimum width in us GETWIDTHMAX 0x32 0 0x130 maximum width in us GETWIDTHSTEPSIZE 0x33 0 0x130 size of one step in us SETWIDTH 0x34 width in us 0x130 width in us GETREPRATE 0x35 0 0x130 reprate in Hz GETREPRATEMIN 0x36 0 0x130 minimum reprate in Hz GETREPRATEMAX 0x37 0 0x130 maximum reprate in Hz GETREPRATESTEPSIZE Ox38 0 0x130 size of one step in Hz SETREPRATE 0x39 reprate in Hz 0x130 reprate in Hz GETCOUNT Ox3A 0 0x130 pulses per trigger GETCOUNTMIN Ox3B 0 0x130 minimum number of pulses GETCOUNTMAX Ox3C 0 0x130 maximum number of pulses GETCOUNTSTEPSIZE Ox3D 0 0x130 size of one step SETCOUNT Ox3E pulses per trigger 0x130 pulses per trigger GETFFWD 0x40 0 0x140 voltage in 1 100V GETFFWDMIN 0x41 0 0x140 minimum voltage in 1 100V GETFFWDMAX 0x42 0 0x140 maximum voltage in 1 100V SETFFWD 0x43 voltage in 1 100V 0x140 voltage in 1 100V 32 Pic LAS FOCUSSING POWER TO THE POINT Command Sent Frame Received Frame Command Parameter Command Parameter GETCAP 0x50 0 0x150 voltage in 1 10V GETCAPMIN 0x51 0 0x150 minimum voltage in 1 10V GETCAPMAX 0x52 0 0x150 maximum voltage in 1 10V SETCAP 0x53 voltage in 1 10V 0x150 voltage in 1 10
12. AC error Please contact your distributor 17 ENABLE POWERON ro ENABLE and or MASTER ENABLE pin was high during power on 18 31 reserved ro 41
13. AX See chapter current regulator for more information GETCUR Returns the actual set point current of the current regulator See chapter current regulator for more information The value is measured in A GETCURMIN Returns the minimal set point current of the current regulator It is measured in A GETCURMAX Returns the maximal set point current of the current regulator It is measured in A SETCUR Sets the set point current of the current regulator to the given value It must be within the borders defined by GETCURMIN and GETCURMAX See chapter current regulator for more information The value is measured in A 37 Pic LAS FOCUSSING POWER TO THE POINT GETOCUR Returns the actual over current protection border If the output current reaches this value the output became disabled The value is measured in A Please note that this protective feature needs to be enabled GETOCURMIN Returns the minimal possible value useable for over current protection It is measured in A GETOCURMAX Returns the minimal possible value useable for over current protection It is measured in A SETOCUR Sets the over current protection border to the given value It must be within the borders defined by GETOCURMIN and GETOCURMAX The value is measured in A GETIDELAY Returns the switching on threshold of the integral part of the current regulator If the output current reaches this value the integral part will be ena
14. CAP Returns the voltage of the capacitor bank The value is measured in 0 1 V GETADCISOLL Returns the external set point current If the ISOLL_EXT bit in the LSTAT register is set this value is used instead of the internal one It is measured in A GETADCPULSSAMPLES Returns the number of samples taken by the LDP QCW during the last pulse Please see chapter pulse measurement for more information GETADCPULSIDIODE This command takes the number of the desired sample and returns the appropriate measurement value It is measured in A If an invalid sample number is given ILGLPARAM will be send GETADCPULSUDIODE This command takes the number of the desired sample and returns the appropriate measurement value It is measured in 0 1 V If an invalid sample number is given ILGLPARAM will be send GETADCPULSVCAP This command takes the number of the desired sample and returns the appropriate measurement value It is measured in 0 1 V If an invalid sample number is given ILGLPARAM will be send GETADCPULSI This command takes the number of the desired sample and returns the appropriate measurement value If an invalid sample number is given ILGLPARAM will be send GETADCPULSP This command takes the number of the desired sample and returns the appropriate measurement value If an invalid sample number is given ILGLPARAM will be send 39 Pic LAS FOCUSSING POWER TO THE POINT Description of the LSTAT Register The follo
15. ENABLE pin Bit Name Read Write Meaning 0 CRC DEVDRV FAIL ro A CRC error was detected in the PLB driver The driver cannot be used This does not affect the device but the PLB 1 CRC DEFAULT FAIL ro A CRC error was detected in the default values A re save of the values should correct this 2 CRC CONFIG FAIL ro A CRC error was detected in the internal configuration values Please contact your distributor reserved ro 4 CRC FFWDCAL FAIL ro A CRC error was detected in the internal calibration values Please contact your distributor 5 OCUR DETECTED ro The over current protection has disabled the output 6 TEMP OVERSTEPPED ro The internal temperature was beyond safe operating limits 7 TEMP_WARNING ro The internal temperature is 5 C before shutdown 8 TEMP_HYSTERESE ro Device is cooling down Temperature needs to drop below maximum 10 9 PULS_TOO_LONG ro The supplied trigger pulse was too long 10 VOLTAGE_5V_FAIL ro Internal supply voltage error 11 VOLTAGE_12V_FAIL ro Internal supply voltage error 12 VOLTAGE_IN_FAIL ro The supply voltage is too low or too high 13 FAILED TO LOAD DEF ro The loading of the default failed Normally this is because of an pending CRC error 14 I2C EEPROM FAIL ro Internal EEprom error Please contact your distributor 15 DC DAC 1 FAIL ro Internal DAC error Please contact your distributor 16 I2C DAC 2 FAIL ro Internal D
16. Laser diode current and compliance voltage are pre processed and fed to the external BOB connector Several security features protect the laser diode and driver from damage D protects the laser diode from reverse currents The switch S is automatically opened when an over current as well as an internal failure such as over temperature etc is detected Operation Principle of LDP QCW driver Element Function C1 Input Buffer Capacitor Cb Capacitor bank S1 Security Switch D1 Laser diode protection diode T1 Current regulation MosFET Shunt LD current monitor Pic LAS FOCUSSING POWER TO THE POINT Trigger modes The LDP QCW supports tree different trigger modes as explained below Internal The pulse generation is performed by an internal pulse generator The pulse width and repetition rate is user configurable via the PLB 21 or the serial interface In addition the number of pulses to be generated can be configured To use this feature the wie soll das gehen user has to set the TRG COUNT bit in the LSTAT register to 1 The current output is automatically disabled after an internal counter reaches the configured value The counter is reset by setting the L ON bit of the LSTAT register to 0 or by setting the ENABLE pin to OV Please note that the maximum pulse width depends on the current repetition rate as well as the maximum repetition rate on the current pulse width The following diagram shows an example of g
17. P This value defines the strength of the proportional part of the current regulator The value ranges from 0 to 4095 20 Pic LAS FOCUSSING POWER TO THE POINT f an Error Occurs If an error occurs during operation the pulse output is switched off the pulser ok ext signal on the BOB connector is pulled low and a message is displayed on the PLB 21 If no other action is described on the display a toggle of the ENABLE pin resets the error condition 21 Pic LAS FOCUSSING POWER TO THE POINT Controlling the LDP QCW via USB Introduction In addition to the PLB 21 the LDP QCW also has a USB interface to communicate with a computer laptop This interface allows communications over a serial text interface as well as using the PicoLAS protocol While the text interface is designed for communication with a terminal program the PicoLAS protocol is designed as a system interact protocol The switching between the two protocols occurs automatically as soon as the LDP QCW receives a certain sequence The corresponding commands are e PING for the PicoLAS protocol e init followed by Enter for the text interface Description of the USB Interface The USB connection of the LDP QCW emulates a virtual COM port under Windows The necessary drivers can be downloaded free of charge under http www ftdichip com Drivers VCP htm or they are already included in the current Linux kernels The virtual COM port created by this can be
18. V GETI 0x60 0 0x160 strength of I GETIMIN 0x60 0 0x160 minimum I value GETIMAX 0x60 0 0x160 maximum value SETI 0x60 strength of I 0x160 strength of I GETP 0x60 0 0x160 strength of P GETPMIN 0x60 0 0x160 minimum P value GETPMAX 0x60 0 0x160 maximum P value SETP 0x60 strength of P 0x160 strength of P GETCUR 0x70 0 0x170 current in A GETCURMIN 0x71 0 0x170 minimum current in A GETCURMAX 0x72 0 0x170 maximum current in A SETCUR 0x73 current in A 0x170 current in A GETOCUR 0x80 0 0x180 over current in A GETOCURMIN 0x81 0 0x180 minimum over current in A GETOCURMAX 0x82 0 0x180 maximum over current in A SETOCUR 0x83 over current in A 0x180 over current in A GETIDELAY 0x90 0 0x190 delay in 1 10 GETIDELAYMIN 0x91 0 0x190 minimum delay in 1 10 GETIDELAYMAX 0x92 0 0x190 maximum delay in 1 10 SETIDELAY 0x93 delay in 1 10 0x190 delay in 1 10 LOADDEFAULTS OxBO 0 Ox1BO 0 see below SAVEDEFAULTS OxB1 0 Ox1BO 0 see below GETADCUDIODE OxCO 0 Ox1CO output voltage in 1 10V GETADCIDIODE OxC1 0 Ox1CO output current in A GETADCVCAP OxC2 0 Ox1CO capacitor voltage in 1 10V GETADC5V OxC3 0 Ox1CO internal 5V in 1 10V GETADC12V OxC4 0 Ox1CO internal 12V in 1 10V GETADCUIN OxC5 0 Ox1CO input voltage in 1 10V 33 Pic LAS FOCUSSING POWER TO THE POINT Command Sent Frame Received Frame Command Parameter Command Parameter GETADCISOLL OxC6 0 Ox1CO external set point current in A
19. addressed like a regular one The connection settings are Baud rate 115200 Data bits 8 Stop bits 1 Parity even 22 Pic LAS FOCUSSING POWER TO THE POINT The Serial Text Interface The following section describes the structure and commands of the text interface Structure Every command that is sent to the LDP QCW must be completed with a CR Enter It consists of a command word followed by one ore more a parameters If the command was successfully executed a 00 is sent otherwise a 01 If there is an error pending the response will be 10 otherwise 11 If the command requires an answer parameter this parameter is sent before the confirmation is given Example The user would like to read out the actual setpoint current User input gcurrent lt Enter gt Output of the LDP CW 250 lt CR gt lt LF gt 00 lt CR gt lt LF gt Example 2 The user would like to set a new setpoint current User input scurrent 270 lt Enter gt Output of the LDP CW 270 lt CR gt lt LF gt O0 CR LF Input is done in ASCII code and is case sensitive Every terminal can be used that supports this standard 23 Pic LAS FOCUSSING POWER TO THE POINT Command s for the LDP QCW The following table contains a command reference for the LDP QCW Command Parameter Description ghwver returns the hardware
20. bled The value is measured in 0 1 of the set point See chapter current regulator for more information GETIDELAYMIN Returns the minimal possible value useable as switching on threshold It is measured in 0 1 GETIDELAYMAX Returns the maximal possible value useable as switching on threshold It is measured in 0 1 GETIDELAY Sets the switching on threshold of the integral part of the current regulator to the given value If the output current reaches this value the integral part will be enabled The value is measured in 0 1 of the set point See chapter current regulator for more information LOADDEFAULTS This command replaces all internal parameters with their default values If the output is enabled during the execution of this command the L_ON bit of the LSTAT register will be cleared and the output disabled This command will fail if the CRC_DEFAULT_FAIL bit in the ERROR register set indicating an error within the data If the DEF PWRON bit in the LSTAT register is set the device automatically loads these values during power up SAVEDEFAULTS This command saves all internal parameters into an EEPROM for later usage Use command LOADDEFAULTS to restore them GETADCUDIODE Returns the current output voltage of the device The value is measured in 0 1 V GETADCIDIODE Returns the current output current of the device The value is measured in A 38 Pic LAS FOCUSSING POWER TO THE POINT GETADCV
21. e position of the serial number is sent in ASCII format 30 Pic LAS FOCUSSING POWER TO THE POINT In addition to these commands there are some answers which can be given to every command Answer Answer Frame Command Parameter RXERROR OxFF10 0 REPEAT OxFF1 1 0 ILGLPARAM OxFF12 0 UNCOM OxFF13 0 RXERROR If a frame is repeated four times and still broken this answer will be send REPEAT The last frame was received in a broken state The transmission must be repeated This can be up to four times before a RXERROR will be send ILGLPARAM The parameter of the last frame had an incorrect value UNCOM The command of the last frame is unknown by the device 31 Pic LAS FOCUSSING POWER TO THE POINT Commands for the LDP QCW The following table contains a list of the commands which the LDP QCW supports in addition to the generally applicable commands An explanation of each individual command follows afterwards Command Sent Frame Received Frame Command Parameter Command Parameter GETTEMP 0x1 0 0x100 temperature in 1 10 C GETTEMP1 Ox2 0 0x100 temperature in 1 10 C GETTEMP2 0x3 0 0x100 temperature in 1 10 C GETTEMP3 0x4 0 0x100 temperature in 1 10 C GETTEMP4 0x5 0 0x100 temperature in 1 10 C GETTEMPOFF 0x6 0 0x100 temperature in 1 10 C GETTEMPHYS 0x8 0 0x100 temperature in 1 10 C GETLSTAT
22. en but Enable not Blink 2x Master Enable is not given 14 Pic LAS FOCUSSING POWER TO THE POINT Power Supply To obtain a good pulsing performance with the driver it requires an appropriate power supply unit PSU The PSU has to supply not only the power that is delivered to the laser diode but also the power to compensate for the losses in the driver itself As the valid supply voltage ranges from 24V to 48V it depends on the configured voltage of the capacitor bank The internal DC DC converter needed at least 5 Volts above the desired capacitor bank voltage VCap Cooling The maximum thermal dissipation of the LDP QCW depends on the configured pulse length repetition rate and capacitor bank voltage Test Load A common method to test the driver is to connect a regular silicon rectifier diode to the driver output Here has to be paid attention to the junction capacitance of the diode Only fast recovery diodes or similar have a low parasitic capacitance as laser diodes To achieve reasonable test results the parasitic elements of the test diode and the connection must be very similar to a laser diode approach Regular silicon rectifier diodes have a junction capacitance of several microfarads and are not a suitable test load The use of these diodes will yield in incorrect current measurement at the pulse edges It is also possible to test the driver using a shortcut This will not damage it but result in an incorrect meas
23. enerated pulses The lower graph shows the internal pulse generator the upper two graphs the trigger pulses generated out of it Infinite 1 0 1 Count 3 oe E L LL OCC LL LS Il 1 Int Puls 0 D D I D I D D T LL LT T T meaning T4 enabling of the output T4 T2 The delay between output enable and the first generated pulse depends on the configured repetition rate It nearly equals the pulse pause time T gt T3 Pulse rise time It depends on the load inductance Ta Ts Pulse fall time It depends on the load inductance Te disabling of the output T re enabling of the output 10 Pic LAS FOCUSSING POWER TO THE POINT External The pulse generation is performed by an external pulse generator connected to the pulse input on the BOB connector The pulses can be inverted by setting the TRG_EDGE bit in the LSTAT register to OT The following diagram shows an example of generated pulses The lower graph shows the external pulse input the upper two graphs the trigger pulses generated out of it 1 Negative 0 Positive Ext Puls LLL Tq m T meaning T4 enabling of the output T2 T3 Pulse rise time It depends on the load inductance Ta Ts Pulse fall time It depends on the load inductance Te disabling of the output T re enabling of the output 11 Pic LAS FOCUSSING POWER TO THE POINT External controlled ext ctrl This trigger mode us
24. eration the pulse output is switched off and the return value of a command is no longer 00 or 01 but 10 or 11 Errors have to be acknowledged with a toggle of the ENABLE signal otherwise switching on again of pulse output is not possible To retrieve the error use the gerror command for the content of the ERROR register or the gerrtxt command for a human readable form 28 Pic LAS FOCUSSING POWER TO THE POINT The PicoLAS Protocol The following section describes the structure and possible commands of the PicoLAS protocol Structure Each transmission consists of 12 bytes called a frame as follows which must be sent consecutively Otherwise the system times out and the transmission must start again from the beginning A frame has a fixed structure The first two bytes describe the command the following eight bytes the parameters followed by one reserved byte and one checksum byte The checksum is calculated out of the first 11 bytes which are linked by a bitwise XOR Thus a frame has the following structure Byte Meaning 1 Bit 8 15 of the command 2 Bit 0 7 of the command 3 Bit 56 63 of the parameter 4 Bit 48 55 of the parameter 5 Bit 40 47 of the parameter 6 Bit 32 39 of the parameter 7 Bit 24 31 of the parameter 8 Bit 16 23 of the parameter 9 Bit 8 15 of the parameter 10 Bit 0 7 of the parameter 11 Reserved always 0x00 12 Checksum A properly received f
25. es the external trigger input to control the internal pulse generator It is used to generate a number of pulses per rising of falling edge of the external trigger input Setting the TRG_EDGE bit in the LSTAT register to 1 uses the rising edge setting it to 0 uses the falling edge The following diagram shows an example of generated pulses The lower graph shows the external pulse input the upper two graphs the trigger pulses generated out of it Negative edge e e S 0 D 1 Positive edge E 0 Sc aul 1 Ext Puls 8 0 8 T TT T T T T meaning T4 enabling of the output T2 T3 Pulse rise time It depends on the load inductance T4 Ts Pulse fall time It depends on the load inductance Te disabling of the output T re enabling of the output 12 Pic LAS FOCUSSING POWER TO THE POINT Regulator The LDP QCW implements a proportional integral PI regulator to control the current flow through the connected load The following diagram shows a simplified layout FFwd Dp i S J set point LN SL E actual gt P Depending of the chosen operating mode the user has the possibility to modify all relevant parameters to a specific need This is done through the digital interface PLB 21 or USB The P value defines the strength of the proportional part of the current regulator This values ranges from 0 to 4095 During normal
26. first set to OV If this feature is not required this pin can be connected to Pin 2 5V Pin 9 Idiode This signal provides near real time measurement of the laser diodes current flow The scaling is 200 amperes per volt measured into 1MOhm Pin 10 setpoint WT This signal is used to provide an external current set point The voltage at this pin is periodically sampled by the driver if it is configured to use the external set point current Pic LAS FOCUSSING POWER TO THE POINT Dos and Don ts Never use any grounded probes at the output Do not connect your oscilloscope to the output This will immediately destroy the driver and the probe For measuring current and voltage you connect the scope to Pin 9 or Pin 4 of the BOB connector respectively Never ground any output connector O Keep connecting cables between power supply and driver as well as the connection between driver and laser diode as short as possible Mount the driver on an appropriate heat sink A Please be aware that there might be hot surfaces be careful not to touch them Do never connect the oscilloscope to the output connectors Please Note above picture shows another but similar PicoLAS driver Pic LAS FOCUSSING POWER TO THE POINT Functional Description The driver uses a DC DC converter to load a capacitor bank to a defined voltage A PI regulator uses T and a shunt to control the current flow through the laser diode
27. hich edge polarity is used for the trigger It is not available in every trigger mode Please see chapter trigger for more information Count This setting defines the number of pulses generated per trigger event It is not available in every trigger mode Please see chapter trigger for more information 19 Pic LAS FOCUSSING POWER TO THE POINT Defaults def pwron If enabled the LDP QCW loads default values every time it is powered on These values are CRC checked at power up If this check fails the values are not loaded and an error message is displayed Save defaults When the Jogdail is turned or the ENTER key is pressed all current values are saved Load defaults When the Jogdail is turned or the ENTER key is pressed all current values are overwritten by the saved ones If the output was enabled at this time it becomes disabled Regler I Delay This value represents the switching point of the integral part of the current regulator It is defined in percent of the setpoint current See chapter current regulator for more information This value defines the strength of the integral part of the current regulator The value ranges from 0 to 4095 FFwd This value represents the feed forward voltage of the current regulator See chapter current regulator for more information Voltage This value represents the precharge voltage of the current regulator See chapter current regulator for more information Regler2
28. ing of the driver It will be replaced in the application by your machine interface i 3k3 setpoint Master enable enable Control BOB Connector pulser_ok 100pF Functional Description of BOB Connector Interface Pic LAS FOCUSSING POWER TO THE POINT Pin Description numerical assorted Pin1 Pulser OK The state of this Signal indicates weather the driver is ready 5V or it has an error pending OV Pin 2 5V This pin provides 5 Volts for external usage Please note that the load should not exceed 10mA otherwise the voltage will drop Pin 3 GND This pin is connected to ground Pin 4 Udiode This signal provides near real time measurement of the laser diodes compliance voltage The scaling is 10 volts per volt measured into 1MOhm Pin 5 GND This pin is connected to ground Pin 6 Pulse This signal is used in the external end external controlled trigger mode Connect your external trigger source to this pin The signal amplitude should be within 3 to 6Volts Pin 7 Enable This signal is used to enable disable the current output of the driver during operation It must be pulled low to reset an error condition or to re enable the driver after Master Enable was pulled low Pin 8 Master Enable This signal is used as an interlock safety feature that disables the complete driver if set to OV during operation In order to re enable the driver after this emergency shutdown the enable signal must
29. inimal pre charge voltage of the capacitor bank It is measured in steps of 0 1 V GETCAPMAX Returns the maximal pre charge voltage of the capacitor bank It is measured in steps of 0 1 V 36 PICeLAS FOCUSSING POWER TO THE POINT SETCAP Sets the pre charge voltage of the capacitor bank to the given value It must be within the borders defined by GETCAPMIN and GETCAPMAX See chapter current regulator for more information The value is measured in steps of 0 1 V GETI Returns the actual strength of the integral part of the current regulator See chapter current regulator for more information GETIMIN Returns the minimal strength of the integral part of the current regulator GETIMAX Returns the maximal strength of the integral part of the current regulator SETI Sets the strength of the proportional part of the current regulator to the given value It must be within the borders defined by GETIMIN and GETIMAX See chapter current regulator for more information GETP Returns the actual strength of the proportional part of the current regulator See chapter current regulator for more information GETPMIN Returns the minimal strength of the proportional part of the current regulator GETPMAX Returns the maximal strength of the proportional part of the current regulator SETP Sets the strength of the proportional part of the current regulator to the given value It must be within the borders defined by GETPMIN and GETPM
30. onnected to the current monitor for more information output 11 Verify that the PULSER OK signal is 5V See chapter Interface specifications for more information Pic LAS FOCUSSING POWER TO THE POINT Description of available Connectors The following drawing shows all connections which are available to the user OO 9 C PLB S OO oo LD V OO ini LD Mini USB type B o ca IV N WM Di GND LD es NE BOB connector edgewise LDP C BOB See section interface specifications for detailed information Break out board Connector connector PLB Connector for PLB 21 protected against polarity reversal Vin Supply voltage GND Supply ground LD Positive laser diode output anode Use both connectors parallel for high currents LD Negative laser diode output cathode Do not connect to ground Use both connectors parallel for high currents Mini USB Mini USB connector for connecting the driver with a computer For a more convenient use of the driver e g in laboratory use we recommend the optional available product accessory LDP C BOB Please see LDP C BOB manual for further details Pic LAS FOCUSSING POWER TO THE POINT Interface Specifications The following figure shows the input and output signals of the external analogue BOB connector The BOB Break out Board is recommended for easy test
31. or in V See chapter Current regulator for more information gffwdmin returns the minimum possible value of the feed forward voltage in V gffwdmax returns the maximum possible value of the feed forward voltage in V sffwd voltage in V sets the feed forward voltage to the given value Two positions after decimal point are used e g 3 45 It must be within the borders of gffwdmin gffwdmax gocur returns the actual over current shutdown value in A The output will be disabled when the output current reaches this value Please note that this function must be enabled to use it gocurmin returns the minimum possible over current shutdown value in A gocurmax returns the maximum possible over current shutdown value in A socur current in A sets the over current shutdown value to the given value in A The output will be disabled when the output current reaches this value Please note that this function must be enabled to use it enocur enables the over current protection disocur disables the over current protection gi returns the actual strength of the integral part of the current regulator gimin returns the minimum strength of the integral part of the current regulator gimax returns the maximum strength of the integral part of the current regulator si value sets the strength of the integral part of the current regulator to the given value gp returns the actual strength of the proportional
32. overshoot at the output The P and I values can be freely chosen but the default values are sufficient for most applications 13 Pic LAS FOCUSSING POWER TO THE POINT VCap The VCap value defines the voltage of the capacitor bank see chapter functional description This value is a bit tricky to determine as it depends on the chosen pulse width repetition rate and compliance voltage If his value is too low the current will drop during the pulse or not even reach the set point if it is too high the output stage will heat up fast and lead to an over temperature shutdown The following equation can be used to calculate the capacitor voltage in dependence of the output current compliance voltage and pulse width Veap SEET 0 112 where Ut compliance voltage Ip current setpoint T pulse pulse width This equation does not use the repetition rate Hence this value must be increased if a current drop is measured during operation For first tests or low pulse width and repetition rate it can safely be set to maximum but the higher this value the greater the power losses are in the output stage LED codes The LDP QCW is equipped with a red and a green status LED The red LED is connected to the Pulser_ok pin of the BOB connector and will lit if the signal goes low The green LED the following codes Permanent on The LDP QCW operates normally and the current output is enabled Blink 1x Master Enable is giv
33. rame must be acknowledged by the recipient with an answer which is also a frame If the acknowledgement does not occur the command has not been processed and the sending procedure should be repeated If the recipient recognizes the command as valid but not the parameters then it will answer with an ILGLPARAM OxFF12 as command In case that the recipient receives an invalid command it will answer with UNCOM OxFF13 If a faulty checksum is recognized then the answer is RXERROR OxFF10 If this error occurs often the connection should be checked Using the REPEAT OxFF11 command the recipient can instruct the sender to send the most recent frame again 29 Pic LAS FOCUSSING POWER TO THE POINT General Commands The following list contains an overview of the general commands which are supported by every product from PicoLAS which makes use of this protocol The explanation of the individual commands is given further below Command Name Sent Frame Answer Frame Command Parameter Command Parameter PING OxFEO1 0 OxFFO1 0 IDENT OxFEO2 0 OxFF02 ID GETHARDVER OxFEO6 0 OxFFO6 Version GETSOFTVER OxFEO7 0 OxFF07 Version GETSERIAL OxFEO8 D 255 OxFFO8 Refer to description GETIDSTRING OxFEO9 0 255 OxFFO9 Refer to description PING This command is used to determine the presence of a connected device and to initialize the interface It has no effect on the condition of the recipien
34. s dista ta ieee Masi tesi rus 1 Controlling the LDP QCW Using a PLB 21 2 ertet ttt ta pede exire aa aii 18 Controlling the LOP QCW via USB itr rre eere renta trees eese Seet See 22 Tee PIOtGCO ERU 29 Pic LAS FOCUSSING POWER TO THE POINT How to use the Manual A Remark The LDP QCW described in this manual is a base plate cooled laser diode driver Improper cooling may cause an internal over temperature shutdown The two fans in one side of the unit have to prevent local thermal hot spots inside the unit They can not compensate improper base plate cooling The air inside an enclosure within an OEM application is usually enough to yield enough air flow Please do not cover any ventilation slots Base plate cooling Depending on the final application and operation regime this unit may stay none cooled or must be assembled onto a heat sink Please refer to chapter Power dissipation for more details about the thermal power losses during operation You me use a passively or an actively air water cooled device Housing All units are delivered with housing Changes are possible the units can be delivered without housing upon request Before powering on your unit read this manual thoroughly and make sure your understood it fully AN Please pay attention to all safety warnings If you have any doubt or suggestion please do not hesitate to contact us Pic LAS FOCUSSING POWER TO THE POINT How to get started refer to
35. t The command parameter is always zero the answer parameter too IDENT It is used to determine the device ID of an attached recipient Has no effect on the condition of the recipient The parameter is always 0 The answer contains the ID GETHARDVER This command instructs the recipient to send back the version number of the hardware being used The parameter is always zero The answer contains the hardware version of the recipient The format of the answer is Ox000000 major minor revision In other words one byte for each of the three elements of the version number As example version 1 2 3 has the parameter 0x00000001 0203 GETSOFTVER Instructs the recipient to send back the version number of the software being used The parameter is always 0 The answer contains the software version of the recipient The format of the answer is 0x000000 major minor revision In other words one byte for each of the three elements of the version number As example version 2 3 4 has the parameter 0x000000020304 GETSERIAL Instructs the recipient to send back its serial number If O is sent as parameter the answer contains the number of ASCII digits of the serial number otherwise the respective position of the serial number is sent in ASCII format GETIDSTRING Instructs the recipient to send back the name of the device If 0 is sent as parameter the answer contains the number of digits of the string otherwise the respectiv
36. the repetition rate of the internal trigger generator When the value reads external the internal generator is not used Cur int ext This value defines the setpoint current When using the internal setpoint the value can be modified by the user When using the external setpoint the value shown is measured value supplied at Pin 10 of the BOB connector The display is updated every few seconds so it is not accurate when using analogue modulation Config Mode In this menu point the operation mode of the LDP QCW can be selected See chapter current regulator for more information Cur stp The LDP QCW can be configured to use the internal or external setpoint current If switched to external an appropriate voltage must be applied to the BOB connector OverCur If enabled the LDP QCW disables automatically if the current flow reaches the given value Temperature The LDP QCW is equipped with several temperature sensors In this submenu the actual and shutdown temperatures can be read and modified All values are in C Dev Off This shows the shutdown temperature If the LDP QCW reaches this temperature during operation the output will be disabled and an error message is displayed Temp 1 4 This shows the actual temperatures measured by the sensors of the LDP QCW Trigger Input This setting defines which trigger input mode is used Please see chapter trigger for more information Edge This setting defines w
37. ured in Hz GETCOUNT Returns the number of pulses the internal pulse generator will generate as soon as it becomes enabled This is only used if the counting mode is enabled See chapter trigger modes for more information GETCOUNTMIN Returns the minimal number of pulses the pulse generator can produce if counting mode is enabled GETCOUNTMAX Returns the maximal number of pulses the pulse generator can produce if counting mode is enabled SETCOUNT Sets the number of pulses the pulse generator will generate to the given value It must be within the borders defined by GETCOUNTMIN and GETCOUNTMAX GETFFWD Returns the actual feed forward voltage used by the current regulator See chapter current regulator for more information It is measured in steps of 0 01 V GETFFWDMIN Returns the minimal feed forward voltage used by the current regulator It is measured in steps of 0 01 V GETFFWDMAX Returns the maximal feed forward voltage used by the current regulator It is measured in steps of 0 01 V SETFFWD Sets the feed forward voltage used by the current regulator to the given value It must be within the borders defined by GETFFWDMIN and GETFFWDMAX See chapter current regulator for more information The value is measured in steps of 0 01 V GETCAP Returns the actual pre charge voltage of the capacitor bank See chapter current regulator for more information It is measured in steps of 0 1 V GETCAPMIN Returns the m
38. urement for the rise and fall time of the current pulse 15 Pic LAS FOCUSSING POWER TO THE POINT Over Temperature Shutdown To protect the Laser Diode and the driver itself the LDP QCW automatically disables itself if its temperature rises above the maximum allowed operating temperature This condition is latched and the LDP QCW will not start working until temperature drops five degrees and the ENABLE pin is toggled During the over temperature shutdown the Pulser_ok output Pin 1 of the BOB Connector is pulled low Absolute Maximum Ratings Output current 50 300A Max compliance voltage 12V short circuit proof Min pulse duration 100us Max pulse duration 5 ms Max repetition rate gt 1 KHz Max duty cycle 10 Max rise time lt 10us Current overshoot lt 5 depending on regulator settings Pulse trigger input 5V TIL external current setting input 200 A V Current monitor 200 A V Connectivity LDP C BOB PLB 21 USB 2 0 Supply voltage 24 48V min 5V above VCap Max power dissipation TBD Dimensions in mm 100 x 180 x 100 Weight 1 2 Kg Operating temperature 0 to 55 C 16 Pic LAS FOCUSSING POWER TO THE POINT Mechanical Dimensions The following dimensions are in millimetres mm
39. wing list contains a description of the individual LSTAT bits These can be read with the GETLSTAT and written with SETLSTAT command Bit Name Read Write Meaning 0 L_ON rw Enables disables the output 1 ISOLL EXT r w When 1 the external current set point is used 2 ENABLE ro Indicates the state of the ENABLE pin of the BOB connector 3 MASTER ENABLE ro Indicates the state of the MASTER ENABLE pin of the BOB connector 4 PULSER OK ro When the bit is read 0 an error has occurred 5 DEF PWRON r w When 1 the device load its default values on power on 6 INIT_COMPLETE ro When 1 the internal power on sequence is complete 7 8 TRG_MODE r w Trigger mode O external pulse input 1 internal pulse generator 2 external controlled 3 not used 9 TRG COUNT r w When 1 the counted mode is active 10 TRG_EDGE Hu When 1 the positive edge is used 11 OVERCUR_EN r w Enabled disables the over current protection 12 13 REG_MODE Hu Regulator mode O manual 1 semi automatic 2 not used 3 not used 14 31 Reserved ro Reserved 40 Pic LAS FOCUSSING POWER TO THE POINT Description of the ERROR Register The following list contains a description of the individual bits of the ERROR register A 1 as a bit leads to a deactivation of the output current Bits O 1 7 and 17 are excluded of this directive The ERROR bits are cleared by disabling of the

User Manual - Schulz Electronic GmbH

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