User Manual - Schulz Electronic GmbH
Contents
1. 100 200 900 1000 Pulsewidth in ns H10A 15 A gt 20 A Im 30 A 40 A 50A 60 A 70A 80 A LDP V 80 100 V3 Max Reprate vs Pulsewidth internal HV without cooling 900 0 Pulsewidth in ns Hi0A 15 A gt 20 A 730 A 40 A 50A 60 A 70A 80 A Repetition rate in kHz Repetition rate in kHz 10 000 1 000 100 10 10 000 1 000 100 10 P c LAS FOCUSSING POWER TO THE POINT LDP V 80 100 V3 Max Reprate vs Pulsewidth external HV with cooling EEE EEE E SE i i aE 100 200 300 400 500 600 700 800 900 1000 Pulsewidth in ns Hi0A 15 A gt 20 A 30 A 40 A 50 A 60 A 70A 80 A LDP V 80 100 V3 Max Reprate vs Pulsewidth ext2. PIC LAS POVVER User Manual LDP V 80 100 V3 Distributor Schulz Electronic nal Power Supplies Schulz Electronic GmbH Dr Rudolf Eberle Strake 2 D 76534 Baden Baden Fon 49 7223 9636 0 Fax 49 7223 9636 90 vertrieb schulz electronic de www schulz electronic de PicoLAS GmbH Company for Innovative Power Electronics and Laser Technology Kaiserstrasse 100 52134 Herzogenrath Rev 15 02 P c LAS FOCUSSING POWER TO THE POINT Table of Contents Hoya ge dent etacepousiaseba vosetapsuncheathyetodsnsuresaundenencesounents 4 How to connect the LDP V 80 100 V3 0 0 ccc ccecceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeees 5 Operans Tea Sa AN ee ren rennen 6 Maximum Duty Cycle vs Output Current ueeeesssssssssssssssseenenennenennennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennnnnnenennnn 8 Current Droop Vs Pulse DuratiOi u ea nennen 8 Internal Structure of the LDP V anne ae ee ee ke 8 How to use the Internal HV DC Supply uueessssssesssssssseeeeeeeensnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnennenenennnnnen 9 Poe I E E 10 daare e 131 0 1 kc E T E E E E A E A T A T 10 Trigger Output Monitor an ee een ee 12 Absolute Ma xim m Raunss useee eu 12 Mechanical Details Of the Base Pie naeh 13 LAS FOCUSSING POWER TO THE POINT Pic LAS FOCUSSING POWER TO THE POINT LDP V 80 100 V3 2 Driver Module for Pulsed Lasers Naw AASS Tenpin ATH s amar
3. 4 ns max 6 ns typ 36 ns Max 40 ns 12 ns lt 1 us 80 A single shot to 2 MHz refer to diagram with operating limits 5V into 50 9 via SMC jack gaivonically isdiated Rogowski call 40 A V into 50 0 12 185 22A Optional O 100 V 30 W external high voltage 25 W 75x 44x20 mm 769 20 to 55 C Measured into a short instead of laser diode Technical data is subject to change without further notice See manual for detailed information Trigger input Trigger output Current monitor Supply voltage Max Power Dissipation Dimensions Weight Operating temperature Optional Accessories PLCS 21 PLB 21 LDP V BOB sdles picdas de Www picolas de Phone 49 O 2407 563 58 0 Fax 49 0 2407 563 58 29 P c LAS FOCUSSING POWER TO THE POINT How to get started Step 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 width to the selected triggering Input ue Connect your Scope Select 50 Ohm termination trig on neg falling edge 200 mV div Apply the supply voltage Connect a 15 V DC power supply to the Security Advise pinheader See page 5 for details Do not touch any leads of the output or the output Note Some supplies have a voltage capacitors as they are connected to a high voltage overshoot during turn
4. Figure Current monitor output scale 10 A Div Product Description The LDP V 80 100 V3 2 is a small and inexpensive source for nanosecond pulses The device is optimized for pulse repetition from single shot up to MHz repetition 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 Y DC supply and a triggering signal are all which is required for operation Additionally you can upgrade the LDP Y with the PLCS 21 controller to enable USB2 0 communication with a PC or the external operating unit PLB 21 PicoLAS GmbH Kaiserstr 100 52134 Hezogenrath Rev 1502 e Compact OEM module e 5 to 80 A output current e lt Ons rise time e Pulse width control via SMC trigger input 12 ns to 10 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 Max output voltage int High voltage Rise time Trigger delay Min pulse duration Max pulse duration Trigger range 5 80A 100 0 100V 1A 15 W typ
5. At the end of the pulse the mosfet closes again and the current stops The generated 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 Upy the laser diode compliance voltage U omp and its differential resistance Rairr PiIc LAS FOCUSSING POWER TO THE POINT I U av U com LD 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 Dgp 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 N m 18 90 V Pin 5 Disable Poti N Des D A Pin 10 Ext HV setpoint Pin 2 HV Pin 8 U Monitor HV Adjust Poti sn Pin 4 15 V Pin 7 Disable Pin 1 3 GND Pin 6 Trigger Rog owski
6. Coil Trigger SMC Pin 9 NTC Current Monitor Rog owski Coil How to use the Internal HV DC Supply The LDP V series provides a high power up to 15 W 1 A 100 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 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 PiIc LAS FOCUSSING POWER TO THE POINT 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 Pulse Output The LDP V series provides ultra rapid pulse rise and fall times in the region of several nanosec
7. ernal HV without cooling 900 0 Pulsewidth in ns E10 A 15 A gt 20 A 30 A O 40 A 50A 60 A 70A 80 A P c 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 Max duty cycle Max duty cycle with with ext HV Voltage in V int HV tt 7 66 35 00236 4399 0019 o wo ota 0 015 4s oo 56100 oon 50 oone 6215 0010 60 00080 7426 0007 7 00059 8637 0005 80 00045 9848 000 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 ae Pulse Duration in us Cmm I 5 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
8. n older versions then V3 Trigger Input The 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 40 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 P c LAS FOCUSSING POWER TO THE POINT Operating Range Diagram Repetition rate in kHz Repetition rate in kHz 10 000 1 000 100 10 000 1 000 100 LDP V 80 100 V3 Max Reprate vs Pulsewidth internal HV with cooling EEE EEE VER EEE SET 300 400 500 600 700
9. on turn off This of up to 100 V may damage 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 output Note The actual current is always some 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 80 100 V3 Solder junction to activate the internal HV supply Rogowski Coil Poti to adjust value of HV DC Pin 10 Pinheader Pin 2 Laser Diode Connection yr EE Connection via Pinh ader GND Ground return Current monitor output 2 HV External high voltage supply Input 0 100 V for cont ia amp ANM 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 Pilsen Trigger Input into 50 Ohm a Disables the Pulser when set high 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 3620 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 i
10. onds However pulse rise and fall depend on the parasitic stray inductance of the 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 s00mY amp Ss IT S Ops pt amp Chi x 500mY Typical Pulse Rise and Fall Times of LDP V 80 100 V3 scale 10 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 10 PiIc LAS FOCUSSING POWER TO THE POINT Ch1 10 Q Ch2 20Y M 40 0ns 5 0GS s IT 80 0ps pt amp Chi x 360mY Typical trigger delay of LDP V 80 100 V3 PIc 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 i
11. t is possible to use this signal for a galvanically isolated current monitor The isolation barrier is suitable for voltages up to 100 V and prevents unwanted ground loops Signal of the Rogowski Coil True load current Positive edge at pulse begin Negative edge at pulse end A Chi x 360mY 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 0 5 V Input voltage range trigger input Disable 0 15 V Storage temperature 20 85 C non condensing 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 12 B i 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 13
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