User Manual - Schulz Electronic GmbH
Contents
1. M 10 0ne 5 065 IT d Onsst Che 50 4 tht 44 How to use the Internal HV DC Supply The LDP AV series provides a high power up to 20 W 2 A 120 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 and the supply voltage is 15 V 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 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 120 V 10 P c LAS FOCUSSING POWER TO THE POINT How to use the External HV DC Input First the solder junction has to be opened to disable the internal HV DC supply Otherwise the external and internal supplies are shorted and both damaged Apply the desired voltage in the range of 0 V to 120 V at pin 2 of the pinheader Obey the Operating Range Diagram 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 120 V Absolute Maximum Ratings Supply voltage range 10 18 V Max voltage at HV Pin 120 V Max output current U monitor NTC 1 mA Input voltage range Disable_Poti Ext_HV_Setpoint 0 5 V Input vol2. PIC LAS POVVER User Manual ere LDP AV DO6 N20 P coLAS GmbH Company for Innovative Power Electronics and Laser Technology Kaiserstrasse 100 Distribution 52134 Herzogenrath Schulz W Electronic Schulz Electronic GmbH Dr Rudolf Eberle Stra e 2 D 76534 Baden Baden Fon 49 7223 9636 0 Fax 49 7223 9636 90 vertrieb schulz electronic de www schulz electronic de P c LAS FOCUSSING POWER TO THE POINT Table of Contents MV DOGS NV retten ee 3 TA OVP TO See enter re nenne 4 How connect the LD PAY sencescsatessunehinntnecacanaucstovaduesedensonatarscendncesoyuiaacinl yeladanbunehanbvededtnaueebanaderendesaenahts 3 Easerdiode een een 6 Internal Structure of the LDP AV an nee 7 PVG and Don Eee ee ae ee 8 Oper Fre IR A a tee tane bese asaas een eamadenaceesecbe E 8 AU Teh Sey nase ee ee 10 How to use the Internal HV DC Supply cece ccccccccccccecccceceeeeeeeeeeeseeseeeeeeeceeeeeeeeauaeeseseeeeeeeeeeeeseeeeeaaas 10 How to use the External HV DC Input 0 ccccccccceeeeeccccscccessssseeeeeeecnececcccsscececessseeeeeeeeeeeeeeeeenaes 1 Absolute Maximum Rau nss ueuen a a iaaea aa Ra Ne RAER 1 Mechanical Details of he Ba Pie nase ne ehe 1 P c LAS FOCUSSING POWER TO THE POINT Rev 12 12 LDP AV DO6 N20 Very short pulse driver module e 4 30 A output current e 2 ns pulse duration e lt 900 psrise time e Very compact OEM module e ngle 15 V supply e Rep rates f
3. input the high speed MOSFET T closes and the current flows from the capacitor through the laser diode MOSFET Coil and resistors C generates an oscillating circuit with the coil and the resistors Due to the constant values of these elements the oscillating frequency and thereby the pulse width is kept constant The output pulse is not affected by the length of the trigger input pulse The generated current depends on the applied high voltage the laser diode compliance voltage and its differential resistance The time that T is open is not relevant for the pulse length Certainly the input pulse of the trigger input has to be minimal 10 ns For longer input pulses the output pulse form is not changing but the stress of the driver increases So the duty cycle of the input pulse is limited to d 0 2 Applications with very high frequencies have special specifications see chapter Operating Range for more details The following diagram shows the output current at current monitor measured with a short at the output for different high voltages PiIc LAS FOCUSSING POWER TO THE POINT n n lt n o m zone 10 0GS iT D pst Chi 250m 2 M 4 Ch A 75 0mV Output Pulse Diagram LDP AV D06 N20 typ Pulse output 1 25ns div 5 A div Traces corresponding to 40 60 80 100 and 120 V HV precharge The laser diode current is measured with current sensing resistors current mo
4. al operating unit PLB 21 Optional Accesories PLCS 21 PLB 21 LDP V BOB LDP V KIT P c 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 e g with a thin copper foil Set the High voltage to the lowest value turn Poti fully counterclockwise Connect a Pulse source to the selected triggering Input e g 100 ns Reprate 1 kHz 5 V TTL 50 Ohm Note The applied duty cycle should be less than d 0 2 See section Triggering input for more details Connect your Scope Select 50 Ohm termination trigger on falling edge 200 mV div Apply the supply voltage Plug in the delivered plug or adjust your Supply to Security Advise Do not touch any leads 15 0 V of the output or the output capacitors as Note Some supplies have a voltage overshoot they are connected to a high voltage of up during turn on turn off This may damage the to 120 V device Adjust the value of the desired pulse current by adjusting the level of the HV with the poti Disconnect the supply remove the short at the output and assemble the Laser Diode Polarity Reconnect the Supply and check the Note The actual current is always some percent optical output of your Laser Diode lower but never higher than the value of step 7 Adjust the current to the desired value P c LAS FOCUSSING POWER TO THE POINT How to connect the LDP AV Solder junction t
5. e stress of this resistor is quite big When the MOSFET turns off the capacitor C is charged over the same resistor and stresses it additionally Especially for high frequencies f gt 500 kHz this is the main part of the stress of R If using the driver in a high frequent application the high voltage and the duty cycle have to be adjusted The following tables show the maximum parameters for these values maximum pulse width of trigger input 600 500 400 300 200 maximum pulse width of trigger input in ns 100 0 0 1 02 03 04 05 06 07 08 09 1 1 1 12 13 14 15 16 17 18 1 9 2 2 1 frequency in MHz A U 80V E U 100V U 120V maximum duty cycle of 0 2 maximum high voltage 120 110 100 90 80 high voltage in V 70 60 50 40 0 1 0 3 0 5 0 7 0 9 1 1 1 3 1 5 1 7 1 9 2 1 frequency in Hz E ius 100ns 10ns P c LAS FOCUSSING POWER TO THE POINT Trigger Delay The delay between the triggering signal and the load current is very low around 35 ns and very constant The pulse to pulse jitter is very stable below 50 ps if supply voltage and temperature are kept constant The output pulse is not affected by the length of the trigger input pulse
6. nitor 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 antiparallel Diode 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 Dos and Don ts Do not exceed specified parameters Do not connect voltages with a reverse polarity to the device Never connect more than 18 0 V to the power terminals of the device Beware Some Lab Power Supplies cause excessive ringing during powering on and off These may damage the unit Pay attention to proper cooling e Attention Do not touch the unit during operation High voltage Operating Range P c LAS FOCUSSING POWER TO THE POINT Due to the structure of the driver the maximum duty cycle of the trigger input the driver output is not affected must be lower than d 0 2 During a HIGH signal at this input the main switching MOSFET is switched on and the high voltage is dropped over the resistor R In fact th
7. o activate Rogowski Coil the internal HV supply No terminal mounted Poti to adjust value of HV DC Hae Pin 10 Pinheader Pin 2 Laser Diode Connection Fi g Fa JEA QOO of ik Trigger Input SMC Current Monitor SMC Connections via Pinheader Name Description Fin 2 HV External high voltage supply Input 0 120 V for connecting an alternative HV DC supply See section How to use the external HV DC Input for details 4 15V 0 Supply voltage connect to a power supply Es Disable_Poti Disables the internal HV setpoint poti when set high Disables the Driver when set high U Monitor High voltage monitor output scale 40 mV V for supervising the actual high voltage 9 NTC Internal 10 kOhm NTC versus GND for temperature monitoring B value 3620 Ext_HV_Setpoint External HV setpoint input scale 25 V V allows control over the internal HV DC source 3 4 5 e Poen miernom S 8 P c LAS FOCUSSING POWER TO THE POINT Trigger Input The trigger input requires a signal of 5 V and is terminated with 50 Ohm The minimum input signal pulse width is 10 ns For more details see below Current Monitor Output The current monitor output has a scale of 20 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 to
8. p side of the driver inner hole Anode outer hole Cathode or at the rectangular pads on top Anode and bottom Cathode 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 120 V Laserdiode Connection Many elements and parasitic stray components may affect the performance of the LDP AV The stray inductance of the load connected to the driver is very important Load means not only the diode itself but also the packaging bondwires and leads between the driver and the diode However PicoLAS has no influence on these parts Thus all measurements have been performed into a short instead of a laser diode Refer to the PicoLAS Appnotes 2 Impedance of Diodes and 3 LD Connections to get more information about parasitic elements and their effect on the pulse shape PiIc LAS FOCUSSING POWER TO THE POINT Internal Structure of the LDP AV Pin 2 HV Pin 8 U Monitor lt HV Adjust Poti P EEEE EEE EIER Pin 4 15 V gt Pin 5 Disable Poti lt JR Pin 10 Ext HV setpoint l u Pin 7 Disable C VY A Pin 1 3 GND ee ir Trigger SMC gt Rogowski Coil Pin 9 NTC Current Monitor Rogowski Coil The LDP AV generates the pulses by a simple but efficient principle First the capacitors C are charged over R whether through the internal HV DC supply or an external high voltage source When a pulse is applied at the trigger
9. rom angle shot to 2 MHz e Current monitor and isolated monitor e Applications LIDAR Measurements Ignition Rangefinding Biochemistry Technical Data Output current 4 30 A Max Output voltage 120 V Int High Voltage 15 120 V 0 1A 15 W Rise time Typ 800 ps max 900 ps Typ trigger delay Typ 36 ns max 40 ns Pulse duration 2 0 ns Trigger range single shot to 2 MHz Trigger input 5 V into 50 Q via SMC jack Trigger output galvanically sep Rogow i coil Current monitor 20 A V into 50 Q Supply voltage 15 V 1A Optional 0 120 V 15W i External high voltage En M2 0ns 1006S m 4 Opsipt Dimensions 65 x 44 x 20 mm Figure Optical output Weight 76g Operating temperature 20 to 55 C e Measured into a short instead of laser diode Technical data is preliminary Product Descrip tion and subject to change without further notice Refer to manual for detailed information The LDP AV Series provides a small and inexpensive source for fixed picosecond and nano second pulses The LDP AV DO6 N20 is designed for a pulse duration of 2 ns It is intended to be used as a laser diode driver The diodes can be mounted directly onto the LDP AV eliminating the need for strip lines The LDP AV is powered by a single 15V DC supply a 120V high voltage DC source is integrated Additionally the LDP AV can be upgraded with the PLCS21 controller to enable USB2 0 communication with a PC or the extern
10. tage range trigger input Disable 0 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 120 V Mechanical Details of the Base Plate 44 00 54 00 73 00 LDP AV D06 N01 11
Download Pdf Manuals
Related Search