User Manual - Schulz Electronic GmbH
Contents
1. 10 000 1 000 N lt 100 8 c 2 gS 40 o 1 0 a a a a a a a a a a a a 0 100 200 300 400 500 600 700 800 900 1000 Pulsewidth in ns 40 A 60A 80 A 120 A 160 A 200 A 240 A LDP V 240 100 V3 Max Reprate vs Pulsewidths internal HV without cooling 1 000 100 N lt 8 10 Q o 1 0 a TS I a a TS S i lt E 0 100 200 300 400 500 600 700 800 900 1000 Pulsewidth in ns O 40 A 60 A 80 A 120 A 160 A 200 A 240A Repetition rate in kHz Repetition rate in kHz 10 000 1 000 100 10 1 000 100 PiIc LAS FOCUSSING POWER TO THE POINT LDP V 240 100 V3 Max Reprate vs Pulsewidth external HV with cooling 100 200 300 400 500 600 700 800 900 1000 Pulsewidth in ns 40A 60A 80 A 120 A 160 A2. 200 A 240 A LDP V 240 100 V3 Max Reprate vs Pulsewidth external HV without cooling 100 200 300 400 500 600 700 800 900 1000 Pulsewidth in ns O 40A l60A 80 A 120 A 160 A 200 A 240 A PiIc LAS FOCUSSING POWER TO THE POINT Maximum Duty Cycle vs Output Current The following tables show the maximum allowable duty cycle depending on a given output current With active cooling of the baseplate A with ext HV Voltage in V with int HV 240 Without cooling of the baseplate Output current in Max duty cycle Typical High Max duty cycle A with ext HV Voltage in V with int HV 0 0100 0 0100 000 0 0044 80 0 0025 0 0025 Current Droop vs Pulse Duration The following table shows the absolute output current droop in A versus pulse length Pulse durations shorter than one microsecond are not considered as the droop is typically lower than 5 oo Pulse Duration in us Internal Structure of the LDP V The LDP V series generates the pulses by a simple but efficient principle First the storage capacitors Cs are charged whether through the internal HV DC supply or an external high voltage source When a pulse is applied at the trigger input the high speed mosfet opens and the current flows from the capacitor through the laser diode mosfet and current sense resistors At the end of the pulse the mosfet closes again and the current stops The gene
3. U S e r M a n u a Rev 09 01 valid from June 2009 LDP V 240 100 V3 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 PiIc LAS FOCUSSING POWER TO THE POINT Table of Contents LOP OO a te ciebeceseact ais E EE E suacnessoadlenceenndeenehacscenaceese E DEEE Ee E a P E EAA E EE E T E E A A A 4 Howto connect e CDP N 240 TOO V eana E NN 5 DET ai RNE DIA EE E E N E 6 Maximum Duty Cycle vs Output CUITENE ccc cecccccee cee eeecceeaeeeeeeeeeaeeeeeesesaeeeeeeeesaaeeeeeeenaas 8 Current Droop vs Pulse Duration inerccc2nconccaseadtashcocedeseutsuiasiameedesauteiceuaiaen deeutamsdadaatadiashiueetaiaeeeoedats 8 Internal Structure Of the LDP V ccc ceccccccccee eenean EENE EAE EEEE A ENERE 8 How to Use the Internal HV DC SUPDIY ccc ccc ccc ceecccccee see eeeceeseeeeeeeeeseeeeeeseeaaeeeeeeesaaeeeeeeeaaas 9 Pa EOU r E dene ates estore E E ye bt atesale wna ttine T hve eneuiteaeanee taper icet 10 TOS MOUE eee E E daieicaunie A E 10 THO i OuUtuUTIVONT O esr E 11 Absolute Maxmur Ih AICS sossen anan AO ONR 11 Mechanical Details of THE Base Plat acid cceeeeocs ese dtosenmstaasenecndacnastiesast dtinsesvarudesnadnicasheleutesautosvens 12 LDP V 240 100 V3 PiIc LAS FOCUSSING POWER TO THE POINT Rev 09 03 valid from June 2009 Driver Module for Pulsed Lasers
4. i Chi 200m Q M 40 0ns 10 0GSss 100ps pt Chi 200mY Figure Current monitor output scale 80 A Div Product Description The LDP V 240 100 V3 is a small and inexpensive source for nanosecond pulses The device is optimized for pulse repetition from single shot up to MHz repetition with duty cycles up to LRA Its typical application is driving pulsed laser diodes Those can be mounted directly onto the LDP V eliminating the need for strip lines The diode must be electrically isolated from earth chassis ground Compatible packages TO 18 TO 5 TO 52 5 6 mm 9 mm and similar Despite its small size the LDP V is designed for ease of use It eliminates the need for multiple peripheral supply units A single 15 V DC supply and a triggering signal are all which is required for operation Additionally you can upgrade the LDP V with the PLCS 21 controller to enable USB2 0 communication with a PC or with the external operating unit PLB 21 e Compact OEM module e 40 to 240 A output e 25 ns rise time e Pulse width control via SMC trigger input 60 ns to gt 1 us e Rep rates from single shot to 2 Mhz e Single 15 V supply e Current monitor and isolated monitor e Applications LIDAR Measurements Ignition Rangefinding Biochemistry Technical Data Output current 40 240 A Max output voltage 100 V int high voltage 0 100V 1A 15 W Rise time typ 25 ns max 35 ns Trigger delay typ 36
5. ns max 40 ns Min pulse duration 60 ns Max pulse duration gt 1p Trigger range single shot to 2 Mhz refer to diagram with operating limits Trigger input 5 V into 50 Q via SMC jack Trigger output galvanically isolated Rogowski coil Current monitor 400 A V into 50 Q Supply voltage 15V22A optional 0 100 V 40W external high voltage Max power dissipation 40 W Dimensions 88 x 44 x 20 mm Weigth 90g Operating temperature 20to 55 C Measured into a short instead of laser diode Technical data is subject to change without further notice See manual for detailed information Optional Accessories PLCS 21 PLB 21 LDP V BOB LDP V KIT PiIc LAS FOCUSSING POWER TO THE POINT How to get started Step 1 2 What to do Check Unpack your Device Make a short at the output Turn the High voltage to the lowest value turn poti fully counterclockwise Connect a Pulse source with the desired pulse a Re 106 atesieic width to the selected triggering Input 9 r prate Connect your Scope Select 50 Ohm termination trigger on neg falling edge 200 mV div Scale 400 A V Apply the supply voltage Connect a 15 V DC power supply to Security Advise the pinheader See page 5 for details Do not touch any leads of the output or the Note Some supplies have a voltage _ output capacitors as they are connected to a overshoot during turn on turn off This high voltage of up to 100 V may dama
6. voltages up to 100 V and prevents unwanted ground loops Signal of the Rogowski Coll True load current Positive edge at pulse begin Negative edge at pulse end Ch1 200m 22 Ch2 1 0 2 M 40 0ns 5 0GS s IT 80 0ps pt amp Ch4 s 1 4 Absolute Maximum Ratings Supply voltage range 10 18 V Max voltage at HV Pin 100 V Max output current U monitor NTC 1 mA Input voltage range Disable_Poti Ext_HV_Setpoint O 5 V Input voltage range trigger input Disable O 15 V Security Advise Do not touch any leads of the output or the output capacitors as they are connected to a high voltage of up to 100 V 11 PiIc LAS FOCUSSING POWER TO THE POINT Mechanical Details of the Base Plate All dimensions in millimetres 3 20 THRU DIN 974 6 00 X 3 20 3 20 THRU DIN 974 6 00 X 3 20 LDPV 240100 V3 1 LDPV 240100 V3 1 ee 12
7. e trigger input requires a signal level of 5 V and is terminated with 50 Ohm Current Monitor Output The current monitor output has a scale of 400 A V with a negative signal output It has a source impedance of 50 Ohm and must be terminated with 50 Ohm to achieve the correct scale Laser Diode Connection The Laser Diode can either be connected via the mounting holes on the top side of the pulser inner hole Anode outer hole Cathode or at the rectangular pads on top Anode and bottom Cathode of the pulser Security Advise Do not touch any leads of the output or the output capacitors as they are connected to a high voltage of up to 100 V PIc LAS FOCUSSING POWER TO THE POINT Operating Range Diagram LDP V 240 100 V3 Max Reprate vs Pulsewidths internal HV with cooling
8. ge the device Adjust the value of the desired pulse current turn the poti clockwise until the current reaches the desired level Disconnect the supply remove the short at the output and assemble the Laser Diode Polarity Reconnect the Supply and check the optical Note The actual current is always some output of your Laser Diode percent lower than the value of step 7 Adjust the current with help of the poti PiIc LAS FOCUSSING POWER TO THE POINT How to connect the LDP V 240 100 V3 Solder junction to activate Rogowski Coil the internal HV supply Poti to adjust value of HV DC a 2 Pin 10 Laser Diode Pinheader Connection Pin 2 Trigger Inout SMC Current monitor output into 50 Ohm Connections via Pinheader Ground return HV External high voltage supply Input 0 100 V for connecting an alternative HV DC supply See page 9 for details Supply Voltage connect to a power supply Disable_Poti Disables the internal HV setpoint poti when set high 6 PulseIn Trigger Inout into 50 Ohm Disables the Pulser when set high 8 U Monitor High volage monitor output scale 40 mV V for supervising the actual high voltage NTC Internal 10 kOhm NTC versus GND for temperature monitoring B value 3630 10 Ext_HV_Setpoint External HV setpoint input scale 25 V V allows control over the internal HV DC source These pins had to be left unconnected in older versions then V3 Trigger Input Th
9. he cabling to the laser diode Direct connection without any kind of wires to the module is absolutely necessary for best results For detailed information about the effect of the laser diode connection on the pulse shape please refer to PicoLAS Application Notes 2 and 3 Ch1 100my 2 M 40 0ns 10 0GS s 100ps pt Chi 200m Typical Pulse Rise and Fall Times of LDP V 240 100 V3 scale 40 A Div Trigger Input The trigger input both on the pin header and the SMC jacket is terminated with 50 Ohm to ground The trigger source has to be able to provide a signal level of 5 V with a 50 Ohm load The delay between the triggering signal and the load current is very low around 36 ns and very constant The pulse to pulse jitter is very stable below 1 ns if the supply voltage and temperature are kept constant Ch1 Z200m 22 M40 0ns5 0GS s IT 80 0ps p Ch4 5 04 amp Chg 1 44 Typical trigger delay of LDP V 240 100 V3 10 PiIc LAS FOCUSSING POWER TO THE POINT Trigger Output Monitor The Trigger Output signal is generated with an integrated isolated Rogowski Coil and provides an ultra fast galvanically isolated signal The signal shape is proportional to the derivative of the load current It can be used for a current response triggering signal and has no delay to the load current Combined with an integrator it is possible to use this signal for a galvanically isolated current monitor The isolation barrier is suitable for
10. o Use the Internal HV DC Supply The LDP V series provides a high power up to 15 W 1 A7100 V internal high voltage supply To adjust the laser diode current to the desired value follow the steps below Notice Make sure that the solder junction HVON is done to activate the HV DC Supply 1 Turn the poti fully counterclockwise 2 Apply the 15 V supply voltage 3 Start Pulses 4 Measure the diode current 5 Adjust the level of the high voltage supply hence the level of the current by turning the poti clockwise Since Version 3 of the LDP V series the HV DC Supply can also be controlled through an external setpoint signal on pin 10 of the pinheader Ext_HV_Setpoint the scale is 25V V To enable the external setpoint pin and disable the internal poti pin 5 Disable_Poti of the pinheader has to be set to high Otherwise the internal poti will override the external signal The high DC voltage can be monitored at pin 8 U Monitor with a scale of 40 mV V Note Older versions are not capable of these features and the above mentioned pins have to be left unconnected Security Advise Do not touch any leads of the output or the output capacitors as they are connected to a high voltage of up to 100 V PiIc LAS FOCUSSING POWER TO THE POINT Pulse Output The LDP V series provides ultra rapid pulse rise and fall times in the region of several nanoseconds However pulse rise and fall depend on the parasitic stray inductance of t
11. rated current depends on the applied high voltage the laser diode compliance voltage and its differential resistance The following formulas give a good estimation of the laser diode current depending on the pulser s high voltage supply Uv the laser diode compliance voltage Uomp and its differential resistance Ayit Uy Vo On md 0 34 Rig PiIc LAS FOCUSSING POWER TO THE POINT The laser diode current is measured with current sensing resistors current monitor output and with the galvanically isolated rogowski coil Disable and trigger input provide full control of the driver s pulsing capability to the user The required DC high voltage can either be applied through an external voltage source or it can be generated with the integrated HV DC supply The internal supply is controlled by the HV setpoint poti or when the Disable_Poti Pin 5 pin is set high via the Ext_HV_setpoint Pin 10 pin A voltage monitor Pin 8 provides feedback of the high dc voltage The Diode Dpp prevents the laser diode from reverse currents a 10kR NTC provides the possibility to monitor the pulser temperature An over temperature protection is NOT integrated on the driver 7 f 18 90 V LD Pin 5 Disable Poti Pin 10 Ext HV setpoint Pin 2 HV Pin 8 U Monitor HV Adjust Po ti 7777 Pin 4 15 V Pin 7 Disable Pin 1 3 GND Pin 6 Trigger Rogowski Coil Trigger SMC Pin 9 NTC Current Monitor Rogowski Coil How t
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