User Manual - preliminary preliminary preliminary
Contents
1. TON PIC LAS User Manual preliminary wzo LDP C 80 20 LDP C 80 40 LDP C 120 20 LDP C 120 40 LDP CW 80 20 LDP CW 80 40 LDP CW 120 20 LDP CW 120 40 This manual is for all pulsed C and continuous current CW driver units above Please note the specifications are different for different units In case of doubt please refer to the corresponding data sheet Before powering on your unit read this manual 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 Tel 49 0 2407 563 58 0 Fax 49 0 2407 563 58 29 E Mail info picolas de Web www picolas de Schulz W Electronic Schulz Electronic GmbH Dr Rudolf Eberle StraRe 2 D 76534 Baden Baden Fon 49 7223 9636 30 Fax 49 7223 9636 90 vertrieb schulzzelectronic de www schulz el ctronic de uk PICOLAS FOCUSSING POWER TO THE POINT Table of Contents TEOT 6 915 2141 6s ici lid ltd dalt 2 6 lt 1 aA O e A E A 3 Description of Connections and JUMPETS ssiscatinsicocio criticada 5 a o E E E E E A E E 6 TINO a AN E A E E tion 8 DO aO DONT nm swiese tocseutsenron sesamin rtalensceieteamaatemsomestene 10 Functional Descriptio sesasiesssnsnnidenaaine nanen anann EEEa EEEE a kiN AEO AEE ERa 11 a SA 12 Power SUD adan2. are subtracted from the shutdown value to calculate the actual borders The data format is foma SETTEMPOFF This command sets the over temperature shutdown temperature to the given value The value must be within the borders defined by the minimum and maximum temperature values given by the GETTEMPACT command The return value contains the same data as in the GETTEMPOFF command see above GETCUR The return value contains the minimum maximum and actual setpoint value in steps of 0 1A The data format is foma maximum current 0 1A unsigned int16 16 30 minimum current 0 1A unsigned int16 31 47 setpoint current 0 1A unsigned int16 SETCUR This command sets the current setpoint to the given value in steps of 0 1A The value must be within the borders defined by the minimum and maximum current values given by the GE7CUR command The return value contains the same data as in the GE7CUR command see above 28 PICOLAS FOCUSSING POWER TO THE POINT GETOCUR The return value contains the minimum maximum and actual over current shutdown value in steps of 0 1A Please note that this feature must be enabled in the LSTAT register The data format Is foma 0 15 maximum current 0 1A unsigned int16 16 30 minimum current 0 1A unsigned int16 31 47 shutdown current 0 1A unsigned int16 SETOCUR This command sets the over current shutdown current to the given value in steps of 0 1A The va
3. eae E EE dorsal coreana cadena 12 A 12 Over Temperature SAO WN asas cartillas 13 A 13 Mechanical DIMAS Seprona RE 13 o E 15 CONTO AON oasis ten 16 Ai ele e 1a 6 lo ae meee nts E rent ent E ee eee A 16 Controlling the LDP C 120 20 using GPE BAZ Darien iia 18 Controlling the LDP C 120 20 via USB isis donde 20 cis e S E A E 32 PICOLAS FOCUSSING POWER TO THE POINT Specifications LDP C 80 20 LDP C 120 20 specs to be corrected Output current Max compliance voltage Max output power Min Pulsewidth Max Pulsewidth Risetime Max Reprate Current ripple Current overshoot Current settling time Current setting input Current monitor Voltage monitor Connectivity Supply voltage Dimensions in mm Operating temperature Weight gt 80 kHz lt 1A lt 5 lt 1 ms O 2 0 V external 50 A V 50 A V 0 1 V V LDP C BOB PLB 21 USB 2 0 4 26V DC at least 2 V above compl voltage 100 x 180 x 100 0to 55 C Ca 1 2 kg LDP C 80 40 specs to be corrected Output current Max compliance voltage Max output power Min Pulsewidth Max Pulsewidth Risetime Max Reprate Current ripple Current overshoot Current settling time Current setting input Current monitor Voltage monitor Connectivity Supply voltage Dimensions in mm Operating temperature Weight 2 80A 20 V 1600 W lt 4 us CW PSUS S on Brie 2 lt 1A lt 5 lt 1ms O 2 0 V external 50 A V 50 A V ivy LDP
4. repre so repetition rate in Hz Outputs the present repetition rate strgmode 0 0 2 Sets the trigger mode to the indicated 2 CW mode value O external trigger input O e 6 2 Outputs the current trigger mode sedge 0 2255 Ooo modifies the rise time of the leading edge smaller is faster repetition rate in Hz Outputs the max repetition rate 1 internal trigger gedge j O 255 Outputs the current rise time If an Error Occurs If an error occurs during operation the pulse output is switched off and the return value of a command is no longer 0 or 1 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 For more details see the description of the ERROR register To retrieve the error use the gerror command for the content of the ERROR register or the gerrtxt command for a human readable form 24 PICOLAS 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 b
5. 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 SAVEDEFAULTS This command saves all settings to an internal EEProm LOADDEFAULTS This command loads previously saved settings into the driver SETPREV This command returns the version of the current regulator parameters The data format is CN menn CN 16 30 unsigned int16 GETSOFTSTEPS The return value contains the minimum maximum and actual soft start delay in steps of 166us The data format is 48 53 reened SETSOFTSTEPS This command sets the soft start delay to the given value in steps of 166us The value must be within the borders defined by the minimum and maximum values given by the GE7SOFTSTEPS command The return value contains the same data as in the GE7SOFTS7TEPS command see above GETPULSEWIDTHMINMAX The return value contains the minimum and maximum pulse width of the internal pulse generator combined in a single 64bit value The data format is foma minimum width 0 1us unsigned int32 32 63 maximum width 0 1us unsigned int32 GETPULSEWIDTH The return value contains the actual pulse width of the internal pulse generator in steps of 0 1us 30 PICOLAS FOCUSSING POWER TO THE POINT SETPULSEWIDTH This command sets the pulse width of the internal pulse generator
6. to the given value in steps of 0 14 The value must be within the borders defined by the minimum and maximum values given by the GETPULSEWIDTHMINMAX command The return value is the updated pulse width GETREPRATEWIDTHMINMAX The return value contains the minimum and maximum repetition rate of the internal pulse generator combined in a single 64bit value The data format is minimum reprate Hz unsigned int32 32 63 maximum reprate Hz unsigned int32 GETREPRATE The return value contains the actual repetition rate of the internal pulse generator in steps of 0 1us SETREPRATE This command sets the repetition rate of the internal pulse generator to the given value in Hz The value must be within the borders defined by the minimum and maximum values given by the GETREPRA TEMINMAX command The return value is the updated repetition rate GETEDGE The return value contains the actual value of the SETEDGE This command sets 31 PICOLAS 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 L_ON Read write Switch on off the pulse outp
7. 2 0 V LDP CW 80 20 50 A V range O 1 6 V LDP C 80 40 bd LDP CW 80 40 50 AW range O 1 6 V tbd LDP C 120 20 bd LDP CW 120 20 50 A V range 0 2 4 V LDP C 120 40 bd LDP CW 120 40 50 A V range 0 2 4 V ldiode Pin 9 This signal is used as an output signal of the internal current shunt It provides near real time measurement of the output current Connect your scope and take into account the following scaling 50 A V Udiode Pin 4 This signal is used to determine the compliance voltage of the connected load It provides near real time measurement Connect your scope and take into account the following scaling 0 1 V V Master Enable MEN Pin 8 The Master Enable provides a safety interlock which disables the driver when pulled low This signal must be pulled high by the user for the driver to start up If the signal is low when the driver is powered on it will not work properly It is recommended that the user also disables the ENABLE after disabling MEN Otherwise there will be a current overshoot on the connected load When no safety interlock is needed this signal can be connected to pin 2 of the BOB connector Enable Pin 7 The ENABLE signal enables disables the driver during normal operation The ENABLE signal must be pulled low by the user in order for the driver to start up If the signal is high when the driver is powered on it will not work properly After the user applies the ENABLE signal the internal
8. C BOB PLB 21 USB 2 0 4 26V DC at least 2 V above compl voltage 100 x 180 x 100 Oto 55 C Ca 1 2 kg Output current Max compliance voltage Max output power Current ripple Current overshoot Analog modulation 100 A Current settling time full scale Current setting input Current monitor Voltage monitor Connectivity Supply voltage Power dissipation O 120 A 12 V diode voltage Dimensions in mm Weight Operating temperature Output current Max compliance voltage Max output power Current ripple Current overshoot Analog modulation 100 A Current settling time full scale Current setting input Current monitor Voltage monitor Connectivity Supply voltage Power dissipation O 120 A 12 V diode voltage Dimensions in mm Weight Operating temperature 10 120 A 20 V 2400 W lt 1 lt 1 CAKES E lt 100 us O 2 4 V external 50 A V 50 A V 0 05 V V LDP C BOB PLB 2 1 USB 2 0 24 V DC at least 3 V above diode laser voltage 150 W 103 x 180 x 69 850g 0to 55 C LDP C 120 40 specs to be corrected 10 120 A 20 V 2400 W lt 1 lt 1 lt 4kHz lt 100 us O 2 4 V external 50 A V 50 A V 0 05 V V LDP C BOB PLB 2 1 USB 2 0 24 V DC at least 3 V above diode laser voltage 150 W 103 x 180 x 69 850g 0to 55 C D i LDP CW 80 20 Output current Max compliance voltage Simmercurrent Max output power Curren
9. DENT 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 O The answer contains the ID GETHARDVER Instructs the driver to send back the version number of its hardware The parameter is always O 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 0x000000010203 GETSOFTVER Instructs the driver to send back the version number of its firmware The parameter is always O The answer contains the software version of the recipient 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 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 answer contains the number of digits of the string otherwise the respective position of the serial number is sent in ASCII format 26 PICOLAS FOCUSSING POWER TO THE POINT Com
10. S 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 Attention has to be paid to the junction capacitance of the diode Only fast recovery diodes or similar have as low a 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 Regular silicon rectifier diodes have a junction capacitance of several microfarads and are not a suitable test load The use of these diodes will result in incorrect current measurement at the pulse edges 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 Please take into account that the laser diode power varies strongly when the output current is modulated Although the driver is equipped with a large input capacitance of 12 mF to buffer these power peaks the power supply has to deliver the required power fast enough to avoid input voltage drops For excessive modulation of the output current the PSU output impedance as well as the line impedance between PSU und diode driver has to be as low as possible When the input voltage drops below 11 5 V the driver shuts down automatically To remove
11. Ser ese es A es se A SE A A A A A A A A A A A A A A A A eer A errr err Oe ee AA A A AA aaa en MEN 1 i A a a A a aaa i t t t t ts tes ty tg to tio t11 t12 ti3t14 tistis tir tig tio tao t PICOLAS FOCUSSING POWER TO THE POINT notes Power on self test 2 5s As PA PA y A SA AAA t4 ts rise time 1us depends on the inductance of the bo connected load 9 lo t1i3 tia te ty fall time depends on the inductance of the i i connected load 11 2 ts le tio tro ti7 tig rise time after depends on the inductance of the MEN toggle connected load PICOLAS FOCUSSING POWER TO THE POINT Dos and Don ts Never ground any output connector This may result in an incorrect current regulation 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 respectively 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 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 Do never connect the oscilloscope to the output connectors PICOLAS FOCUSSING POWER TO THE POINT Functional Description The driver operates with three paral
12. Voltage in must be at least 2 V above compliance e voltage of diode LD Mini USB type B l anode for connecting the laser A diode LD PLB USB connector for Please connect laser diode always controlling the unit to both anodes and both cathodes via PC PLB connector connect here the optional PLB board do not mix up with BOB connector plug would not fit LDP C BOB See section interface specifications for detailed information Break Out Board Connector connector PLB Connector for PLB 21 human interface protected against polarity reversal Vin Supply voltage 5 24V must be 2 V above laser diode compliance voltage GND Supply ground LD Positive laser diode output anode It is highly recommended to use both connectors parallel especially for high currents LD Negative laser diode output cathode Do not connect to ground It is highly recommended to use both connectors parallel especially for high currents Mini USB Mini USB connector for linking the driver to 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 or the PLB 21 Please see LDP C BOB and PLB 21 manual for further details FOCUSSING POWER TO THE POINT Interface Specifications The following figure shows the input and output signals of the external analogue BOB connector This connector can be found on the perpendicular circuit board on the right side a
13. abled 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 If 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 and re enables the driver 20 PICOLAS FOCUSSING POWER TO THE POINT Controlling the driver via USB Introduction In addition to the PLB 2 1 the driver 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 w
14. current regulator ramps the current flow to the configured setpoint in a configured amount of time soft start Pulse Pin 6 This signal is only used by the LDP C It provides fast access to the output stage and can be used to pulse the output current It actual usage depends on the configured trigger mode Please see chapter Trigger modes for more details Pulser OK Pin 1 This signal intorms the user about any error condition It is pulled low by the driver when no internal error is detected PICOLAS FOCUSSING POWER TO THE POINT agram D The following diagram shows the effect of the MEN ENABLE and PULSE input signals to the internal end external current flow iming nO ee SS SS o See eee po A e e lext im pae a ee Laa lint 0 CD aD oe ow ow oe oe oe om om om om om om om om om mm ee mee wee me we we we wee we wwe e e ss ws as e e e as os os ss ss ss os ss ee we we ee we we we we e e ae a 1 am am am am an am amp Ge an am am am ap de aD a ob D OD OD UD OD D OD OD Om La e ev e e o o D ls oal al a al am am a amp a am SSeS PULS es 2 4 tt tt 1 _ __ __ __ __ __ A ee AR AX ENABLE 0 EA A AER OUN hms tm som men A ml eh OD A D aa D dih s m ein tn smn A D min sno a a e cs co E a is A O sin A A A de a tts SO aa A GD OND io e do a ci ci E ms A mem AO E A E ms e tee si Yo a 1 a am am an am am a PULSER_OK 0 es e oe e oe oe ap e e oe A A a e e e e e e e e e e e e e non e e e px er eee a
15. elated error condition persists a hardware failure is possible The bit 20 indicates that the ENABLE pin was set high during power on It must remain low until the pulser_ok_ext signal or the related bit in the LSTAT register is set high The bit 21 indicates that the MEN pin was set low during power on Is must set high during power on Otherwise the self test will fail Be Ra Rg ooo pea e e Device is cooling down Temperature needs to drop below maximum 10 Device temperature 5 before shutdown 5 E LOAD_NONE No connected load detected gt OVERCURRENT Maximum current overstepped 7 PHASE_UNCAL Read Device is not properly calibrated Please contact your distributor SHUT_UNCAL Read Device is not properly calibrated Please contact your distributor I2C_FAIL Read Internal communication error Please contact your distributor 10 VCC_LOW Read Supply voltage below minimum 11 VCC_HIGH Supply voltage above maximum VCC_DROP Supply voltage drops during operation 13 CROWBAR_ALWAYS_OPEN Read Indicates a defect crowbar Please contact your distributor 14 CROWBAR_ALWAYS_CLOSE Read Indicates a defect crowbar Please contact your distributor 15 HST_ALWAYS_OPEN Read Indicates a defect safety switch Please contact your distributor 16 HST_ALWAYS_CLOSE Read Indicates a defect safety switch Please contact your distributor CFG_CHKSUM_FAIL 18 Read Indicates an incorrect configuration Please con
16. er 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 12 2 lt CR gt lt LF gt O lt CR gt lt LF gt Example 2 The user would like to set a new setpoint current User input scurrent 25 7 lt Enter gt Output of the LDP CW 25 7 lt CR gt lt LF gt O lt CR gt lt LF gt Input is done in ASCII code and Is case sensitive Every terminal can be used that supports this Standard Command s for the LDP C CW The following table contains a command reference for the LDP CW series These commands are also implemented in the LDP C series Command Parameter Description scurrent Current in A Sets the pulse current to the indicated value A dot Is used as decimal point No more then on decimal place is used 12 22 is the same as 12 2 gcurrentmax Current in A Outputs the maximum output current ee Outputs the minimum simmer current a A a a a AN 22 seo FOCUSSING POWER TO THE POINT Activates the output sistat 32 bit number Sets the LSTAT register to the value glstat EA 32 bit number Outputs the LSTAT register gerror 32 bit number Outputs the ERROR register gerbt J error error text description of every pending error of every pending error A Temperature in eee to ee eee the shutdown temperature to the passed value gtempoff ON Temperature in C Outputs the current shu
17. es The driver has two status LEDs located above the BOB connector The green LED indicates the readiness the red LED an error condition of the driver The following table shows the meaning of the different blink codes Ne areeni reito off normal operation ST Ce AU EME CN ECC CN tano poner when self test has been contact your distributor completed E power self test failed when driver was on before set ENABLE low and wait until the JN il Eta ft blink 1x temperature warning temperature warning Sa pe 9 por blink 3x VCC too high decrease VCC to normal levels ENE MO LA blink 4x Ax VCC too VCC too low increase VCC to increase VCC to normal levels levels 11 ES 5x VCC i re during operation coe sure the power supply provides enough current 12 Ye 6x either a shortcut or open remove shortcut on the output clamps on the output detected and check the connected load if enabled by the user 13 off blink 7x safety switch So failed 13 PiIc LAS FOCUSSING POWER TO THE POINT Mechanical Dimensions Over all height 69 0 mm All dimensions in mm Ds upper side surface PICOLAS FOCUSSING POWER TO THE POINT Power on self test Each time the driver is powered on it performs a test of its internal safety features The MEN pin has to be HIGH while the ENABLE pin has to be LOW for the self test to work properly Changing either of the signals during the self test will result in a fai
18. ith 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 lt Enter gt for the text interface If the LDP C 120 20 and the USB interface are both connected at the same time then only the USB interface can be used As soon as the USB connection is connected to a computer then the LDP C 120 20 switches automatically over to this Description of the USB Interface The USB connection of the driver emulates a virtual COM port under Windows The necessary drivers can be downloaded free of charge under http Awww ttdichip com Drivers VCP htm or they are already included in the current Linux kernels The virtual COM port created by this can be addressed like a regular one The connection settings are Baud rate 115200 Data bits 21 PICOLAS 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 drivermust be completed with a CR Enter It consists of a command word followed by a parameter If the command was successfully executed a 0 is sent otherwise a 1 If there is an error pending the response will be 10 otherwise 11 If the command requires an answ
19. l as the current regulator is controlled by the ENABLE signal and the L_ON bit in the LSTAT register Every time the output is enabled the driver performs a soft start and ramps up the output current Please see the chapters Soft start and Timing Diagram for more details LDP C The LDP C series can be configured by the user for internal external or CW trigger 16 PICOLAS FOCUSSING POWER TO THE POINT CW When the CW mode is configured the LDP C behaves like the LDP CW series See above for more details External The output stage is controlled by the PULSE signal Like the CW mode the current regulator is controlled by the ENABLE signal and L_ON bit but the output stage is controlled separately Hence the user can enable the internal current flow but wait for the soft start to be finished before enabling the output stage This will lead to a very low rise time compared to the soft start The actual rise time can be configured using the digital control Please see the chapters Soft start and Timing Diagram for more details Internal The output stage is controlled by an internal pulse generator which can be enabled disabled using the L_ON bit in the LSTAT register The PULS input is not used The values for pulse width and repetition rate can be configured via USB or the PLB 21 Please see the chapters Soft start and Timing Diagram for more details PICOLAS FOCUSSING POWER TO THE POINT C
20. lel buck converters S1 52 D1 D2 L1 3 4 D3 D4 L2 S5 S6 D5 D6 L3 Every single converter has an independent control loop with a current sensor Imeas1 Imeas2 and Imeas3 The set point current that is defined by the user is evenly spread over all three converters The current through the laser diode is measured directly at the output pins with the help of a shunt resistor Inductor current additional current of all three phases laser diode current and compliance voltage are pre processed and then fed into to the external BOB connector An enable input as well as a status Output are available Several security features protect the laser diode and driver from damage D8 protects the laser diode from reverse currents S7 could short the output pins and the bypass diode D7 protects the driver in case of a load failure To protect the laser diode during start up of the driver SO remains opened until the supply voltage has reached a stable level In case of a failure the control unit disables the driver A soft start mechanism slowly rises the current after an over temperature shutdown or at start up Ya E HH iv o ADS i USB PLB Operation Principle of LDP C 120 20 driver Element Function SO Security Switch C1 S1 2 3 S4 5 S6 D1 Buck Converter D2 D3 D4 D5 D6 L1 L2 L3 CO Input Buffer Capacitor S7 Shunt MosFETs Short Output D7 D8 Laser diode and driver protection diodes Shunt LD current monitor PICOLA
21. lue must be within the borders defined by the minimum and maximum current values given by the GETOCUR command The return value contains the same data as in the GETOCUR command see above GETSIMMER The return value contains the minimum maximum and actual setpoint value of the simmer current in steps of 0 1A The data format is maximum simmer current 0 1A unsigned int16 16 30 minimum simmer current 0 1A unsigned int16 31 47 actual simmer current 0 1A unsigned int16 SETSIMMER This command sets the actual simmer current to the given value in steps of 0 1A The value must be within the borders defined by the minimum and maximum simmer current values given by the GETSIMMER command The return value contains the same data as in the GE7S MMER command see above GETMESSSIGNALS The return value contains the measurement values of the input voltage output voltage and output current The data format is foma input voltage 0 1V unsigned int16 16 30 output voltage 0 1V unsigned int16 31 47 output current 0 1A unsigned int16 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 29 PICOLAS FOCUSSING POWER TO THE POINT GETREGS This command returns the value of the LSTAT and ERROR register combined in a
22. lure 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 failure is detected The following diagram shows the individual tests and the approximate time it will take Begin 5 Open S Close in gt Vinmin Dus and S Open Vin Vinyman 5 Close T 2 65 7Ous emperature sensors ok Up lt O 5V Dus and Un lt 1V BOOus So Open 5 Close Uio 0 54 140m and U Vinf2 PULSER_OK 0 a Set ERROR bits Y PICOLAS FOCUSSING POWER TO THE POINT Controlling the driver The driver can be operated stand alone with a PLB 21 or by a PC connected to it via USB It remembers all settings from the last time it was powered on unless it is configured to load default values on power on In latter case it loads pre configured settings each time the power is toggled switched off and on again 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 you may use the BOB Connector to control the driver If so configured pin 10 at the BOB connector Icetpoint can be used to control the setpoint current To enable the output pin7 at the BOB connector ENABLE mu
23. mand s 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 Paren seer o o o a CN CC CS CI CE E E ensayo eae Co oe fae CC SRR r _Yo 10 CA E A 10 CA ls NC 0 CE a CN The following table contains additional commands which apply only to the LDP C variants Command Parameter Command Parameter GETPULSEWIDTHMINMAX 0x0030 O ex0083 64 bit value GETPULSEWIDTH 0x0031 0x0053 32 bit value SETPULSEWIDTH 0x0032 32 bit value 0x0053 32 bit value 0 0x0054 64 bit value GETREPRATE 0x0034 CA 0x0054 32 bit value SETREPRATE 0x0035 32 bit value 0x0054 32 bit value GETEDGE 0x0036 0x0058 8 bit value GETREPRATEMINMAX 0x0033 27 PICOLAS FOCUSSING POWER TO THE POINT Description of the Individual Commands GETTEMPOFF The return value contains the average temperature as well as the individual values of all tree temperature sensors The data format is foma average temperature C signed int16 16 30 temperature sensor 1 C signed int16 31 47 temperature sensor 2 C signed int16 48 63 temperature sensor 3 C signed int16 GETTEMPACT The return value contains the warning and cool down hysteresis values as well as the maximum minimum and current value of the shutdown temperature The values for warning and hysteresis
24. n 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 SStart 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 19 PICOLAS FOCUSSING POWER TO THE POINT Def pwron 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 changed 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 dis
25. ontrolling 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 SsStart Defaults o Def pwron o Load defaults o Save defaults Temperature o Dev Off o Temp 1 o Temp 2 o Temp 3 Measurement o Uin o Udiode o IDiode 18 PICOLAS FOCUSSING POWER TO THE POINT Pulse parameter 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 meas
26. rent setting input Current monitor O 1 6 V external 50 A V 50 A V 0 1 V V LDP C BOB PLB 21 USB 2 0 4 26 V DC at least 1 V above compl voltage Power dissipation 80 A 90 W 12V Dimensions in mm 100 x 180 x 58 Weight 760 g Operating temperature Oto 55 C Voltage monitor Connectivity Supply voltage LDP CW 120 40 specs to be corrected 2 120 A Output current os die gt MN lt rr uo PICOLAS FOCUSSING POWER TO THE POINT Connecting and Interfacing for internal use only not connected connector for optional BOB or for panni interfacing to application connector for input supply voltage hidden Laser Diode output please always connect both _ ____ USB connector hidden anodes and s AA connector for optional PLB both cathodes to your laser W2 RAAE ao human interface Firwl AS never connect to ground ch do not connect oscilloscope poo here this might destroy unit connector for optional fan that comes with housing The above picture might differ in some minor details form your model The following drawing shows all connections which are available to the user BOB connector for controlling and interfacing the device controller board with BOB connector for Pin assginment see next page O perpendicular to main board LD ii cathode for connecting the laser Ground for supply diode voltage in O LD Supply
27. s shown on the previous page The BOB Break Out Board is recommended for easy testing of the driver It will be replaced in the application by your machine interface The PLB 21 is a human interface that allows for full control of all relevant device parameters 3K3 setpoint i Pin 7 enables disables driver must be low 0 V for start up Pin 9 Output current measurement connect oscilloscope see data sheet for scaling Pin 10 Input analog modulation see data sheet for value Master enable Pin 8 Master Enable Safety interlock Must be pulled high 5V on start up If not used connect to Pin 2 5V enable Pin 6 Pulse in for LDP C series drivers Can be used to trigger output Control Pin 4 Output of compliance voltage Connect oscilloscope see data sheet for scaling Pin 2 pulser_ok Output of 5 V power supply for BOB Pin 1 Output of error condition Is low 0 V when no internal error and unit works ok Functional Description of BOB Connector Interface PICOLAS FOCUSSING POWER TO THE POINT Settings and Readings lsetpoint Pin 10 to be completed This input signal is used to provide an analogue setpoint value amplitude modulation In order to use the analogue setpoint it must be configured in the PC via USB or the PLB Please apply a voltage corresponding to the desired current settings according to the following table LDP C 80 20 50 A V range O
28. st 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 set low and high again in order to enable the driver again When using the LDP C series the ENABLE pin enables the driver but not the current output Pin6 of the 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 driver 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 Trigger Modes LDP CW The LDP CW series has no different trigger modes The PULSE input signal is not used The output Stage as wel
29. t ripple Current overshoot Analog modulation 100 A Current settling time full scale Current setting input Current monitor Voltage monitor Connectivity Supply voltage Power dissipation 120A 12 V Dimensions in mm Weight Operating temperature 2 120A 20V Du 120A 2400 W lt 1A lt 1 lt AkHz lt 100 us O 2 4 V external 50 A V 50 A V 0 1 V V LDP C BOB PLB 21 USB 2 0 15 26 V DC at least 1 V above compl voltage 150 W 100 x 180 x 58 760g 0to 55 C LDP CW 80 40 specs to be corrected Output current 2 80A Max compliance voltage 20V Simmercurrent Lona Max output power 1600 W Current ripple lt 1A Current overshoot lt 1 Analog modulation 60 A gt 2 kHz Current settling time lt 150 us full scale LAS FOCUSSING POWER TO THE POINT Current setting input Current monitor Voltage monitor Connectivity Supply voltage Power dissipation 80 A 12V Dimensions in mm Weight Operating temperature O 1 6 V external 50 A V 50 A V Da viv LDP C BOB PLB 21 USB 2 0 4 26V DC at least 1 V above compl voltage 90 W 100 x 180 x 58 760 g O to 55 C LDP CW 120 20 Output current 2 80A Max compliance voltage 20V Simmercurrent 2 80A Max output power 1600 W Current ripple lt 1A Current overshoot lt 1 Analog modulation 60 A gt 2 kHz Current settling time lt 150 us full scale Cur
30. tact your distributor Read MEN was low during power on Reserved 31 33
31. tdown temperature gtempoffmin Temperature in C Outputs the minimum shutdown temperature gtempoffmax A Temperature in C Outputs the maximum shutdown temperature gserial serial number Returns the device serial number E ppo current settings Prints out an overview of all settings E A A hardware version prints out the hardware version CM SII ico clic shortcut 1 Enables the shortcut protection A O Disables the shortcut protection overcurrent 1 Enables the over current protection O Disables the over current protection noload 1 0 1 Automatically disabled the output if no load is detected see text for more details O Leave the driver enabled if load fails ssoftstart 32 bit number 32 bit number sets the soft start time to the given number multiplied by 166us gsoftstart o 32 bit number returns the current soft start time in steps of 166us 23 PICOLAS FOCUSSING POWER TO THE POINT The following table contains all commands for the LDP C 120 20 series These are not implemented within the LDP CW 120 20 spulse pulse width in us pulse width in us Sets the pulse width to the indicated value A dot is used as decimal point No more then on decimal place is used EX pulse width in us Outputs the present pulse width EA pulse width in us Outputs the minimum pulse width E i pulse width in us Outputs the maximum pulse width repetition rate in Hz repetition rate in Hz Sets the repetition rate to the indicated value
32. this condition the enable line has to be toggled switched of and on again Cooling The driver produces up to 130 W of losses Thus the base plate has to be mounted on a heat sink to ensure proper operation and prevent an over temperature shutdown If working with high currents above 90 A it is recommended to cool the power inductors as well This can be achieved easily by placing the diode driver with its heat sink in the air flow of a fan W 0 0 2 A 60 _out A 4 power dissipation Power dissipation as a function of output current 12 PICOLAS FOCUSSING POWER TO THE POINT Over Temperature Shutdown To protect the laser diode and the driver itself the unit automatically disables itself if tts temperature rises above the configured shutdown temperature This condition is latched and the diode driver will not start working until temperature drops five degrees below the shutdown temperature and the ENABLE pin is toggled During the over temperature shutdown the PULSER_OK output Pin 1 of the BOB Connector is pulled low The shutdown temperature can be modified using a PLB 21 or via the USB connector Soft Start The driver implements a soft start mechanism which is activated every time the output is enabled via the ENABLE pin or the L_ON bit in the LSTAT register This mechanism ramps up the current output from zero the setpoint in a configurable amount of time LED blink cod
33. ured 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 O to 255 The smaller the value 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 o
34. ut Note that this bit is automatically set high every time the driver is powered on TRG_MODE Read Write Trigger mode O external pulse input 1 internal pulse generator 2 CW mode In case of a LDP CW this is always read 2 ISOLL_EXT Read Write When 1 the external setpoint current is used INIT_COMPLETE The power on test is performed successfully PULSER_OK Indicates that the driver is in no error condition SHORTCUT_CHECK Read Write When 1 the driver will check for an shortcut on the output clamps during operation NOLOAD_CHECK Read Write When 1 the driver will check for open output clamps during operation OVERCURRENT_CHECK Read Write When 1 the driver will check for an over current on the connected load during operation CW_ONLY Read Indicates that only CW operation is possible TRG_MODE 2 DEFAULT_ON_PWRON Read Write When 1 the driver will load the default values at each power up 4 ENABLE_OK Indicates that the external enable is given 32 PICOLAS 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 drivers output Bit 3 is excluded of this directive as it is just a warning The Bits 1 6 and 10 12 are cleared every time the ENABLE pin is set low All other bits are cleared by toggling the main power If any self test r
35. yte The checksum is calculated out of the first 11 bytes which are linked by a bitwise XOR Thus a frame has the following structure pa A E A A 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 OxFF13 If a faulty checksum is recognized then the answer is RXERROR OxFF10 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 25 PICOLAS 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 PING OxFEO1 oY OxFFO1 IDENT OxFEO2 gt OxFFO2 a feearowen ore 0 roe veson ersorven oer fo 007 Ven ooo PING This command 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 O the answer parameter too I
Download Pdf Manuals
Related Search