LDP-CW 20-50_Manaul12-9 - Schulz Electronic GmbH
Contents
1. Pic LAS DOWER User Manual IE LDP CW 20 50 Before powering on your unit read this manual thoroughly and make sure your understood it fully Please pay attention to all safety warnings If you have any doubt or suggestion please do not hesitate to contact us PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology KaiserstraBe 100 52134 Herzogenrath pou B Tel 49 0 2407 563 58 0 Schulz Electronic GmbH Dr Rudolf Eberle StraBe 2 Fax 49 0 2407 563 58 29 D 76534 Baden Baden 2 A Fon 49 7223 9636 30 E Mail info picolas de Fax 49 7223 9636 90 vertrieb Qschulzzel ctronic de www schulz electronic de Web www picolas de L 5 FOCUSSING POWER TO THE POINT Pic LAS FOCUSSING POWER TO THE POINT LDP CW 20 50 Fully digital cw driver for High Power Laser Diodes e Output current 0 20 A e Compliance voltage 0 50 V e Output power 1kW e Coverage of cw range e Analog modulation e Half Brick size 35 cm 14 OW w Figure Soft Start Current monitor output scale 10A Div Product Description The LDP CW 20 50 OEM is a very affordable compact and efficient current supply for an output power up to 1kW The capability ranges from continuous output current to analog modulated waveforms like sinusoidal rectangular or triangular The modulation is limited usually by the load inductance Intended fi2. is the smaller is the rise time It is not used in CW mode Config The LDP C has some additional safety features which can be user enabled This is done within this Submenu Occur not in HW version 1 2 Using the F1 key an additional over current protection can be enabled If enabled the LDP C disables automatically if the output current rises below the given maximum value The display shows the actual value and it can be modified using the jogdial If disabled the display will just read disabled Scut If enabled the LDP C disables automatically if a shortcut on the output clamps during operation is detected Please note that this feature will not operate properly when the setpoint current is modulated or a compliance voltage below 1 volt is used Noload If enabled the LDP C disables automatically if the load has been disconnected during operation Please note that this feature will not operate properly if the setpoint current is modulated Start The value shown here is the time span in which the LDP C raises its output current to the given setpoint when enabled Config The driver can load a default setting each time it powers up or the user commands it to do so This is done within this Submenu Def pwron 13 Pic LAS FOCUSSING POWER TO THE POINT When enabled the driver loads the saved settings each time it powers up Load When activated via turning the Jogdial or the ENTER key all internal registers are change
3. sink to ensure proper operation and prevent an over temperature shutdown If working with high currents above 10 A it is recommended to cool the power inductors as well This can be achieved easily by placing the driver with its heat sink in the air flow of a fan Losses in W 1 2 3 4 5 6 7 8 9 10 11 12 43 14 15 16 17 18 19 20 lout in A Power dissipation over output current 5 FOCUSSING POWER TO THE POINT Over Temperature Shutdown To protect itself the LDP CW automatically shuts down itself if its temperature rises above 80 C This condition is latched and the appropriate bit in the ERROR register is set To re enable the LDP CW the ENABLE pin must be toggled set low and then high Mechanical Dimensions Over all height 30 mm All dimensions in mm PICeLAS FOCUSSING POWER TO THE POINT Power on self test Each time the driver is powered up it performs a test of its internal safety features The driver cannot be enabled until a self test has been performed successfully The PULSER OK signal will be pulled high when the test has been successful The test will take less than 5 seconds but can take up to 15 seconds due to internal time outs if any failures are detected Controlling the driver The driver can be operated stand alone with a PLB 21 or a PC connected to it via USB It remembers all settings from the last time it was powered on unless configured to load default v
4. value GETKD 0 004 0 0x010C 32 bit value SETKD 0x004B Refer to description 0x010C 32 bit value 5 FOCUSSING POWER THE POINT Description of the Individual Commands GETSOLL The return value contains the actual setpoint value in steps of 0 01A GETSOLLMIN The return value contains the minimum setpoint value in steps of 0 01A GETSOLLMAX The return value contains the maximum setpoint value in steps of 0 01A SETSOLL This command sets the current setpoint to the given value in steps of 0 01A The value must be within the borders defined by the minimum and maximum current values given by the GETSOLLMIN and GETSOLLMAX command The return value contains the actual setpoint value GETSOLLEXT The return value contains the measured and converted value of the external analogue setpoint in steps of 0 01A GETLSTAT This command returns the value of the LSTAT register For a complete description of this register see below GETERROR This command returns the value of the ERROR register For a complete description of this register see below GETREGS This command returns the value of the LSTAT and ERROR register combined in a single 64bit value The lower 32bit represents the LSTAT register the upper 32bit the ERROR register SETLSTAT This command sets the LSTAT register to the given value The return value contains the new register value CLEARERROR This command clears a part of the inter
5. If the driver is not properly cooled it will shut down How to get started with an PLB 21 Step 1 2 What to do Unpack your Device Connect the PLB 21 Apply the supply voltage Wait until pulser ok is high Apply the current setpoint Set enable pin high Check Note Use the PLB 21 pin header and the special cable Apply any voltage between 12 V and 48 V to VCC with respect to GND The Voltage must be at least 5 V higher than the expected compliance voltage of the laser diode Pin 5 with respect to Pin 6 must change from O V to 3 3 V Use the PLB 21 to switch from external to internal setpoint set the setpoint by turning the dial Apply 3 3 V to pin 4 of the BOB connector The current will ramp up now If the driver is not properly cooled it will shut down PICeLAS FOCUSSING POWER TO THE POINT Dos and Don ts Never make a short at the output This will not do any harm to the laser driver but will result in an incorrect current measurement Keep the connection 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 The driver will shut down under over temperature circumstances Depending on the desired current a slight airflow across the black coils on top is necessary Please keep the temperature of these devices below 85 C This diver uses a high side current sensing techni
6. alues on power on In this case it loads pre configured settings each time the power is applied Connecting a digital control to the driver does not alter the internal settings No digital control factory default If no digital control PLB 21 or USB is attached only the BOB Connector could be used to control the driver If configured so the pin 10 at the BOB connector ketpoint can be used to control the setpoint current To enable the output pin7 at the BOB connector ENABLE must be set HIGH If an error occurs e g over temperature the driver will be disabled and the pin 1 of the BOB connector PULSER OK is pulled low The enable pin has to be toggled to enable the driver again When using the LDP C series the ENABLE pin enables the driver but not the current output Pin6 of BOB connector PULSE directly controls the current output in that case The PULSE input does not trigger a soft start Hence the configured setpoint current applies as fast as possible to the output PLB 21 If a PLB 21 is attached to the driver it can be used to control the behavior of the driver The PLB 21 may ask for a driver to download This must be confirmed with yes in order for the PLB 21 to work properly This must always be done when the PLB 21 was connected to any other PicoLAS product After the download all operating parameters can be accessed using the PLB 21 For a detailed description see chapter PLB 21 below USB If the driv
7. are cleared every time the ENABLE pin is set low or when the CLEAERROR command is used The Bits 6 and 7 are set during the power on self test They can not be cleared by the ENABLE pin or the CLEARERROR command If one of these bits is set the supply voltage should be switch off and on again If the error persists the LDP CW needs to be repaired Bit Name R W Meaning O DRV_OVERTEMP Read Indicates an over temperature shutdown of the output stage Read Indicates a shutdown of the LDP CW due to a load failure or an over current 2 reserved Read Reserved 3 reserved Read Reserved 4 CFG CHKSUM FAIL Read Indicates that the internal configuration register is corrupt If this error persists the LDP CW needs to be repaired 5 reserved Read Reserved 6 CAL CHKSUM FAIL Read Indicates that the internal calibration registers are corrupt If this error persists the LDP CW needs to be repaired 7 DEF CHKSUM FAIL Read Indicates that the internal default registers are corrupt The default values should be re saved 8 reserved Read Reserved 9 Reserved Read Reserved 31 23 Pic LAS FOCUSSING POWER TO THE POINT
8. d to the previously saved values The output stage has to be re enabled via the L_ON bit or the FIRE Key afterwards Save When activated via turning the Jogdial or the ENTER key all internal registers are stored into an internal EEprom for later usage Temperature The LDP C 120 20 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 user defined shutdown temperature If the LDP C 120 20 reaches this temperature during operation the output will be disabled and an error message is displayed It can be modified within 40 80 C Temp 1 3 This shows the actual temperatures measured by the sensors of the LDP C 120 20 Measurement This submenu holds some runtime measurement information Uin This shows the measured value of the supply voltage Udiode This shows the measured value of the compliance voltage of the connected load The output must be enabled for a correct result Please note that this is not a real time measurement If the Setpoint is modulated the display may show incorrect values In that case use the signal of the analogue current monitor at pin 9 on the BOB connector with appropriate measurement equipment Idiode This shows the measured value of the current flow through the connected load f an Error Occurs If an error occurs during operation the pulse output is switched off the pulser ok e
9. e o Dev Off o Temp 1 o Temp 2 o Temp 3 Measurement o Uin o Udiode o 1 PICeLAS FOCUSSING POWER TO THE POINT Pulseparameter In this menu point can be modified the setpoint current and simmer current See the device specific datasheet for detailed information Width This value defines the width of the pulses generated by the internal pulse generator if the internal trigger is used It is measured in steps of 0 1us Reprate This value defines the repetition rate of the pulses generated by the internal pulse generator if the internal trigger is used It is measured in steps of 1 Hz Cur int ext This value defines the setpoint current It can be switched between internal int and external ext setpoint by pressing the F1 key 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 Simmer A Simmer current is not available with a LDP C series when using trigger modes internal or external Trigger The LDP C supports various trigger modes These are selected in this Submenu Trigger Possible values are internal external and CW Please note that any change disables the output Edge This value defines the speed of the rising edge Possible ranges from 0 to 255 The smaller the value
10. eld of application are laser soldering and welding as well as generic surface treatment and show lasers The innovative current regulation concept of the LDP CW 20 50 produces compared to the commonly used linear regulation concept considerably less losses Hence only one supply voltage is needed for the control logic and the power stage The current consumption drawn from the power supply only needs to cover the average laser power and is typically much less than 20 A PicoLAS GmbH Kaiserstr 100 52134 Herzogenrath e Several protective features e High efficiency Technical Data Output current Max compliance voltage Current ripple Ripple frequency Current overshoot Analog modulation 10 A Current settling time full scale Current setting input Current monitor Voltage monitor Supply voltage Max power dissipation Dimensions in mm Weight Operating temperature 0 20A 1 50V 196 5 1 MHz 1 90 TBD lt 60 ps Analog or digital 10 A V 0 1 VV 12 55 V DC min 5 V above laser diode voltage 45 W 60 9 x 57 8 x 29 Half Brick size 194g 0to 55 C Spedfications measured with a fast recovery diode instead of a laser diode Technical data is subject to change without further notice Designed to shield your laser diode from damage the LDP CW 20 50 features a number of powerful protective safeguards e Innovative current regulation concept actively prevents laser diode from oversho
11. er SETKD This command sets the value of the D controller to the given value The value must be within the borders defined by the minimum and maximum current values given by the GETKDMIN and GETKDMAX command The return value contains the actual value Pic LAS FOCUSSING POWER TO THE POINT Register description Description of the LSTAT Register The following list contains a description of the individual LSTAT bits These can be read with GETLSTAT and written with SETLSTAT With SETLSTAT a complete 32 bit word must always be written Thus to change individual bits first the register must be read out with GETLSTAT then the desired bits changed and then with SETLSTAT passed again to the LDP CW Bit Name Read Write Meaning 0 L_ON Read write Switch on off the pulse output Note that this bit is automatically set high every time the driver is powered on 1 ISOLL EXT Read Write When 1 the external setpoint current is used 2 PULSER OK Read Indicates that the driver is in no error condition 3 ENABLE OK Read Indicates that the external enable is given 4 DEFAULT PWRON Read Write When 1 the driver will load the default values at each power up 5 31 Reserved Read Reserved 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 drivers output The Bits O and 1
12. er is connected to a PC using an USB cable all operating parameters can be accessed via a serial RS232 terminal program or the PicoLAS protocol The PLB 21 is automatically disabled if a USB connection is established For a detailed description of the serial text protocol and the PicoLAS protocol see below PC If the driver is connected to a PC all operating parameters can be accessed via a serial RS232 terminal program or the PicoLAS protocol For a detailed description of the serial text protocol and the PicoLAS protocol see below 11 Pic LAS FOCUSSING POWER TO THE POINT Controlling the driver using a PLB 21 To control the driver with a PLB 21 it must be connected via the enclosed cable The PLB 21 will not work if the USB and the PLB 21 are connected at the same time When the PLB 21 is connected the first time to the driver the user is 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 driver 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 o Simmer Trigger o Mode o Edge Config o Occur not in HW version 1 2 o Scut o Noload o SStart Defaults o Def pwron o Load defaults o Save defaults Temperatur
13. n S1 S2 S3 S4 S5 S6 S7 S8 Buck converter D1 D2 D3 D4 D5 D6 D7 D8 L1 L2 L3 L4 CO Input buffer capacitor D7 D8 Laser diode and driver protection diodes 5 FOCUSSING POWER TO THE POINT 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 have 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 Power Supply The power supply must be able to cover the output power plus the internal power losses please see next chapter Example you have a 48 V power supply and a Jenoptik JOLD 75 FC 11 laser diode with up to 20 V compliance voltage and a 12 A current max values At 12 A the driver needs at least additional 12 W to cover the internal losses The total power consumption will be 20 V x 12 A 12 W 2 252 W Divided by 48 V this yields 5 25 A better 6 A of current consumption at the DC terminals Cooling The driver produces up to 31 W of losses Thus the base plate has to be mounted on a heat
14. n Error Occurs If an error occurs during operation 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 LDP CW output is not possible For more details see the description of the ERROR register To retrieve the error use the gerr command for the content of the ERROR register or the gerrtxt command for a human readable form 17 5 FOCUSSING POWER 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 Bi
15. nal ERROR register For a detailed description of the ERROR register see below SAVEDEFAULTS This command saves all settings to an internal EEProm LOADDEFAULTS This command loads previously saved settings into the driver 21 5 FOCUSSING POWER THE POINT GETKPMIN The return value contains the minimum value of the P controller GETKPMAX The return value contains the maximum value of the P controller GETKP The return value contains the maximum value of the P controller SETKP This command sets the value of the P controller to the given value The value must be within the borders defined by the minimum and maximum current values given by the GETKPMIN and GETKPMAX command The return value contains the actual value GETKIMIN The return value contains the minimum value of the I controller GETKIMAX The return value contains the maximum value of the I controller GETKI The return value contains the maximum value of the I controller SETKI This command sets the value of the I controller to the given value The value must be within the borders defined by the minimum and maximum current values given by the GE7KIMIN and GETKIMAX command The return value contains the actual value GETKDMIN The return value contains the minimum value of the D controller GETKDMAX The return value contains the maximum value of the D controller GETKD The return value contains the maximum value of the D controll
16. ommand is used to determine the presence of a connected driver and to initialize its interface It does not change any registers The command parameter is always 0 the answer parameter too IDENT This command is used to determine the device ID of an attached recipient It has no effect on the condition of the recipient The parameter is always 0 The answer contains the ID GETHARDVER Instructs the driver to send back the version number of its hardware The parameter is always 0 The answer contains the hardware version number The format of the answer is 0x000000 lt major gt lt minor gt lt revision gt 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 driver to send back the version number of its firmware 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 driver 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 driver to send back its name If O is sent as parameter the ans
17. ots and over current e Integrated Soft Start e Over temperature shutdown e Enable Disable input e Driver status output e Protection of the laser diode against reverse currents Optional Accessories LDP C BOB PLB 21 Phone 49 0 2407 563 58 0 Fax 49 0 2407 563 58 29 sales amp picolas de www picolas de 5 FOCUSSING POWER TO THE POINT Table of Contents LDP CW 20 50 Data Sheet ee e Deere tian dickies eta Mate em RI 1 Table Of Contents e eed dte i tratte P e c in dap ee tae 3 Description of CoBnmectlons uote e re bet be te aie berries ka oe 4 How to get started quickstart without PLB 21 ssssssssssem eene 6 How to get started with an PLB 21 6 DOS Dol is M M I AM M ME M E 7 Absolute Maximum Ratings ssssssssssssssseseeeeeee een eene ener eere nre eren nnn nnns 7 Functional Description ssssssssssssssseneeeeeeee nee rennen nnn nenne enne nenne 8 Ido ase 9 Power SUP PIV RR 9 Cool 9 Over Temperature eee ener nen nennen nnn nnns nnns 10 Power ON SEIT test iip edes De ihaldatum kat 11 Mechanical Ditmensioris iet dee db e peu t tp hakka kadakate p le 10 Power oti selt test etit anthem kak teame Rin ee uos 11 Controlling ines e b
18. puts the ERROR register gerrtxt error text description of every pending error slstat 32 bit number Sets the LSTAT register to the value glstat 32 bit number Outputs the LSTAT register gserial serial number Returns the device serial number gname device name Returns the devices internal name ghwver hardware version prints out the hardware version gswver software version prints out the software version ps current settings Prints out an overview of all settings loaddefault loads previously saved settings savedefault saves the current settings as defaults sp 32 bit number Sets the parameter of the P controller gp P value returns the parameter of the P controller gpmin minimum P value returns the minimum parameter of the P controller gpmax maximum P value returns the maximum parameter of the P controller si 32 bit number Sets the parameter of the I controller gi value returns the parameter of the l controller gimin minimum value returns the minimum parameter of the controller gimax maximum value returns the maximum parameter of the l controller sd 32 bit number Sets the parameter of the D controller gd D value returns the parameter of the D controller gdmin minimum D value returns the minimum parameter of the D controller gdmax maximum D value returns the maximum parameter of the D controller f a
19. que The GND of the VCC terminal is the same as the GND of the LD terminal The driver is CW operation only Absolute Maximum Ratings Supply voltage range 12 V 56 V destroying limit Maximum input current 20 A Maximum laser diode output current 20 A Maximum laser diode compliance voltage 50 V BOB connector input and output voltages 0 V to 3 3 V terminals are 5 V proof BOB connector output currents 1 mA Auxiliary 3 3 V supply voltage output current 30 mA Pin 8 of BOB Conn planned for Rev 2 1 Auxiliary 12 V supply voltage output current 100 mA Pin1 of PLB 21 Conn Operating temperature 0 55 C 5 FOCUSSING POWER THE POINT Functional Description The LDP CW operates with four parallel buck converters 51 52 D1 D2 L1 S3 S4 D3 D4 L2 S5 S6 D5 D6 L3 S7 S8 D7 D8 L4 Every single converter has an independent control loop with a current sensor Imeas1 Imeas2 Imeas3 and Imeas4 The set point current that is defined by the user is evenly spread over all four converters Several security features protect the laser diode and LDP CW from damage D8 protects the laser diode from reverse currents while D7 protects the driver in case of a load failure In case of a failure the control unit disables the LDP CW A soft start mechanism slowly raises the current after enabling the LDP CW Vin GND 5232 PLB Operation Principle of LDP CW 20 50 driver Element Functio
20. re utes 11 Controlling the driver using a PLB 21 12 Controlling the driver via PC sssssssssssssssssseneeeeneeeeeeemeeen nennen eer ener nnns 15 Register deseriptlOl dodi ere antt ive tte M ret betta path katel eene 24 FOCUSSING POWER TO THE POINT Description of Connections The following drawing shows all connections that are available to the user 4 Holes for Heatsink 3 1 mm trough VCC GND GND 760 9000 0000 LDP C BOB Connector Pin 1 marked RS232 PLB Conn Pin 1 marked VCC Supply voltage 12 48V 56 V absolute maximum GND Supply ground LD Positive laser diode output anode Do not connect to ground 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 LDP C BOB Conn Mini MOLEX Connector for analog TTL control of the driver see below RS232 PLB21 Conn Mini MOLEX Connector for RS232 Communication or the PLB21 see below 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 Pin Assignments and Description of the MOLEX pin header Pin Number Description Direction Comments 1 marked in red reserved Do no
21. t 8 15 of the parameter 10 Bit 0 7 of the parameter 11 Reserved always 0x00 12 Checksum A properly received frame must be acknowledged by the recipient with an answer which is also a frame If the acknowledgement does not occur then 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 a ILGLPARAM OxFF12 as command In the case that the recipient receives an invalid command it will answer with UNCOM 0xFF13 If a faulty checksum is recognized then the answer is RXERROR 0xFF10 If this error occurs often then the connection should be checked Using the REPEAT OxFF11 command the recipient can instruct the sender to send the most recent frame again 5 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 7 Version GETSERIAL 0 20 OxFFO8 Refer to description GETIDSTRING OxFEO9 0 20 OxFFO9 Refer to description PING This c
22. t connect 2 reserved Do not connect 3 I Soll Input Scale 150 mV A 4 Enable Ext Input 0 V disabled 3 3 V driver enabled 5 Pulser Ok Output V laser diode driver not ok or power up self test not passed yet 3 3 V driver ok test passed 6 GND Output 7 reserved 8 right GND Output Do not connect Pin Number Description Direction Comments 1 marked in red 12 V Output Only for the use with the PLB21 prevent any overload or short max 100 MA 2 TXD VO RS232 Standard serial interface 3 RXD VO RS232 Standard serial interface 4 right GND Output Pic LAS FOCUSSING POWER TO THE POINT How to get started quick start without PLB 21 What to do Unpack your Device Apply the supply voltage Wait until pulser ok is high Apply the current setpoint scale 150 mV A Set enable pin high Check Note Apply any voltage between 12 V and 48 V at VCC with respect to GND The Voltage must be at least 5 V higher than the expected compliance voltage of the laser diode driver Make sure there is no voltage surge that could destroy the unit when switching the power supply on Pin 5 with respect to Pin 6 must change from 0 V to 3 3 V For example apply 1 5 V to Pin 3 of the BOB connector with respect to GND Pin 6 if you want to set current to 10 A Apply 3 3 V to pin 4 of the BOB connector The current will ramp up now
23. therwise 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 gcur lt Enter gt Output of the LDP CW 12 25 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 scur 25 7 lt Enter gt Output of the LDP CW 25 7 lt CR gt lt LF gt 00 lt CR gt lt LF gt Input is done in ASCII code and is case sensitive Every terminal can be used which supports this standard Commands for the LDP CW The following table contains a command reference for the LDP CW Command Parameter Answer Description scur Current in A Sets the pulse current to the indicated value dot is used as decimal point No more then two decimal places are used 12 225 is the same as 12 22 gcur Current in A Outputs the present output current gcurmin Current in A Outputs the minimum output current gcurmax Current in A Outputs the maximum output current on Activates the output off Deactivates the output curext use external current setpoint curint use internal current setpoint PICeLAS FOCUSSING POWER TO THE POINT Command Parameter Answer Description gerr 32 bit number Out
24. wer contains the number of digits of the string otherwise the respective position of the serial number is sent in ASCII format 19 5 FOCUSSING POWER THE POINT Commands for the driver The following table contains a list of the commands which the LDP CW supports in addition to the generally applicable commands An explanation of the individual commands and its parameters follows afterwards Command Sent Frame Received Frame Command Parameter Command Parameter GETSOLL 0x0010 0 0x0101 32 bit value GETSOLLMIN 0x001 1 0 0x0101 32 bit value GETSOLLMAX 0x0012 0 0x0101 32 bit value SETSOLL 0x0013 Refer to description 0x0101 32 bit value GETSOLLEXT 0x0014 0 0x0101 32 bit value GETLSTAT 0x0020 0 0x0103 32 bit value GETERROR 0x0021 0 0x0114 32 bit value GETREGS 0x0022 0 0x0105 64 bit value SETLSTAT 0x0023 Refer to description 0x0103 32 bit value CLEARERROR 0x0024 0 0x0104 0 SAVEDEFAULTS 0x0027 0 0x0112 0 LOADDEFAULTS 0x0028 0 0x0112 0 GETKPMIN 0x0040 0 0Ox010A 32 bit value GETKPMAX 0x0041 0 Ox010A 32 bit value GETKP 0x0042 0 0x010A 32 bit value SETKP 0x0043 Refer to description 0x010A 32 bit value GETKIMIN 0x0044 0 0x010B 32 bit value GETKIMAX 0x0045 0 0x010B 32 bit value GETKI 0x0046 0 0x010B 32 bit value SETKI 0x0047 Refer to description 0x010B 32 bit value GETKDMIN 0x0048 0 0x010C 32 bit value GETKDMAX 0x0049 0 0x010C 32 bit
25. xt 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 and re enables the driver Pic LAS FOCUSSING POWER TO THE POINT Controlling the driver via a PC Introduction When the LDP CW is connected to a PC it allows communications over a serial text interface as well as 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 driver 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 RS232 Interface The LDP CW 20 50 implements a standard RS232 interface It can be connected to a PC using a three wire connection The connection settings are Baud rate 115200 Data bits 8 Stop bits 1 Parity even 15 5 FOCUSSING POWER 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 CW must be completed with a CR Enter It consists of a command word followed by one or more parameters If the command was successfully executed a 00 is sent o
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