- Schulz Electronic GmbH
Contents
1. 0 100 200 300 400 500 600 700 800 900 Uin mV 1000 12 PIC FOCUSSING POWER TO THE POINT Ild mA current voltage characteristic cw mode 500 450 400 350 300 250 200 150 0 25 50 75 100 125 150 175 200 225 250 Uin mV 13 Pic LAS FOCUSSING POWER TO THE POINT Frequency Response Vee 15V Output Current 125 mA Testload short circiut Output Current Frequency Response lout Signal in dB f Frequency MHz Current Monitor Frequency Response Imon Signal in dB 100 f Frequency MHz 14 Pic LAS FOCUSSING POWER TO THE POINT Cooling The seed driver is base plate cooled only Please assemble the entire unit to a heatsink which is capable to take out the heat The heatsink is suitable if the system temperature does not exceed the maximum operating limits To achieve best performance the base plate temperature should be kept in the range of 10 C 35 C The peak heat load is 10 W Test Load For the first testings a test load may be assembled instead of the laser diode This test load may be a short circuit or a fast schottky diode like MBRO540 Please connect the test load only between Anode and Cathode LD and LD and prevent shorts to any other part of the circuit The connections for LD are at the bottom and for LD on the top2. User Manual W LDS VRM 005 preliminary Manual PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology Schulz y Electronic Kaiserstra e 100 Distribution 52134 Herzogenrath FS Tel 49 0 2407 563 58 0 Fax 49 0 2407 563 58 2 9 Schulz Electronic GmbH Dr Rudolf Eberle StraBe d E Mail info picolas de D 76534 Baden Baden Fon 49 7223 9636 30 H Fax 49 7223 9636 90 Web www picolas de vertrieb schulzzet ctronic de www schulz el ctronic de Pic LAS FOCUSSING POWER TO THE POINT Table of Contents IADS Or CON Senden neden nieteens nen 2 How TO USE Ln 3 Absolute Maximum Ratings destroying limits annees ereen erenennenseeensereeenennnneenn 3 Dos ane ele ue 4 HOW IO GER SaR Ol EE 5 ROOMS el Laser Diode PINOU EE 6 Required electrical characteristics of the Laser Diod e nennen eer enn eener ennen eenen 6 Description of the Connectors of the LDS VRM 005 an sonsverrvorenersinessensseedeird eere dend sheets 7 Input 2 and Current Monitor 1 eeens actos heidenen 8 Propadatomaaay P2 re Temere e Ee E EE 9 Description of the SUB D 9 Connector 7 9 Power Supply 3 and Supply Absolute Maximum Rang 10 BOCK Be EN 10 Description Of BIAS ONE EE 11 ETEN 12 GO oee E E E E E EE E EAR 14 Desk Eet 15 Mecanica Me MTA O eO OEO 16 Pic LAS FOCUSSING POWER TO THE POINT How to use the Manual A Remark The LDS VRM 005 described in this manual is a base plate cooled laser diode d
3. side Pic LAS FOCUSSING POWER TO THE POINT Mechanical Dimensions The following dimensions are in millimetres mm ABCD Pic LAS FOCUSSING POWER TO THE POINT The following dimensions are in millimetres mm r nd T ABCDEFG L op za E 17
4. with a 50 ohm termination 7 Disable the input signal and turn the power sources for 15V Vcc Take out the test diode or bypass Assemble the final laser diode 8 Turn the power supply for the 15V Vcc on and feed a Pulse on the input terminal 5 Pic LAS FOCUSSING POWER TO THE POINT Required Laser Diode Pinout The LDS VRM 005 is designed for the direct connection of almost any kind of laser diode The landing patterns accept 2 and 3 terminal packaged Laser Diodes A Never use cables gt 10nH This will cause excessive ringing and may damage the LD Laser Diode Connection the rectangular Pads on top Cathode and bottom Anode The dimensions of the rectangular Pads are 1 mmx 5 mm There is no optical feedback path The unit is current controlled only AN Please shorten the legs to avoid short circuits inside the driver The maximum internal stray impedance must not exceed 10 nH to AN achieve best performance Required electrical characteristics of the Laser Diode Parameter __ Commen min typ Max Laser Diode Forward Voltage Laser Diode Forward Voltage CW mode 500 mA 6 FOCUSSING POWER TO THE POINT Description of the Connectors of the LDS VRM 005 Connector __ Function Assembled Type You need 1 Signal input SMC male SMC female MULTICOMP 1169655 Current monitor SMC male SMC female Output MULTICOMP 1169655 3 Power connector D Sub 9 male D SUB9 female on cable Ha
5. INT Description of BIAS POT 3 Bias Potentiometer P1 P1 Bias This Value of Potentiometer P1 is part of the calibration procedure D performed at PicoLAS It must not be changed by customer Changes have an impact on the performance of the driver and may damage the LD and the driver All changes are monitored and will cause the lost of the warranty The factory settings provide the Bias current to 15 20mA This current flows always through the laser diode BIAS_POT Connector To increase the Bias current an additional resistor can be connected externally Resistance value on pin 2 and pin 3 of connector 3 sets the Bias current for the control unit Reduction of the total resistance results an increase of the Bias current S A short circuit between the Pin 2 and 3 would be increase the Bias current in level of 500 mA Use as example a resistor Rext and potentiometer Pext in series The resistor Rext set the maximum and Pext the minimum of Bias current Rext 1k for 150 mA Bias current There can not be set as the factory settings smaller Bias current of 15 20mA LDS VRM 005 BIAS POT Connector 11 Pic LAS FOCUSSING POWER TO THE POINT If the increase of Bias current is not necessary let the pin 2 and 3 floating Linearity current voltage characteristic pulse mode 500 450 400 350 300 250 200 Laser Diode mA 150 100 50
6. ossible Mount the driver on an appropriate heat sink Please be aware that there might be hot surfaces be careful not to touch them PiIc LAS FOCUSSING POWER TO THE POINT How to get started You need an additional fast arbitrary waveform generator AWG which has to be connected to the Inout MMCX Terminal There is no AWG on board of the driver The PCB is very thin Mechanical forced have to be avoided to prevent damage Mechanical damages are not covered by warranty Step What to do Check 1 Assemble the driver onto an appropriate heat sink 2 Solder a dummy diode between LD and Refer to Chapter Test Load LD pad alternatively make a short circuit there 3 Connect GND 15V Vcc Power Supply Required current for this step is disabled around 18 mA 4 Connect AWG or pulse generator on Refer to all chapters referencing Input Terminal no pulse before power Input Connector 1 supply enabled 5 Enable the power source for 15V Vcc Make sure not to overload the and feed a Pulse on the input terminal laser diode or the driver For example 0 5 V amplitude 1 us pulse width and 300 us repetition rate 6 Check it whether the Current Monitor On Imon Output Connector 2 Output pulses shape is similar to the input you can measure a signal signal comparable with the input signal 1 0 V on the input terminal results a current of 500 mA by test diode or bypass and 400 mV on the Imon Output Use an oscilloscope
7. river Base plate cooling Depending on the final application and operation regime this unit may stay uncooled or must be assembled onto a heat sink Please refer to chapter Power dissipation for more details about the thermal power losses during operation You me use a passively or an actively air water cooled device Housing All units are delivered with housing Changes are possible the units can be delivered without housing upon request Before powering on your unit read this manual thoroughly and make sure your understood it fully AN Please pay attention to all safety warnings If you have any doubt or suggestion please do not hesitate to contact us Absolute Maximum Ratings destroying limits All Input Pins must not exceed the voltage range below zero GND and beyond VCC VCC Limit Refer to table in chapter Power Supply 3 Peak output current 0 5 A Max Imon current 10mA Operating temperature range 0 C 60 C Best performance operating temperature range 10 C 35 C Storage temperature range 20 C 70 C Pic LAS FOCUSSING POWER TO THE POINT Dos and Don ts Never ground any output connector S 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 Keep connecting cables between power supply and driver as well as the connection between driver and laser diode as short as p
8. rting 0966118 7500 Pic LAS FOCUSSING POWER TO THE POINT Input 1 and Current Monitor 2 The driving analogue signal is provided via Connector 1 The output current is following the input signal within the limitations bandwidth max current rise time proportional refer to Chapter Linearity File Edit Vertical Horizj cqg Trig Display Cursors Measure Masks Math Uti M 40 Ops 5 UDMGd 200nsat Cha ZU ch4 200m 22 A Cha so agami File Edit Vertical Horiz 4cq Trig Display Cursors Measure Masks Math UD Chi 10 Dm 14 Che 100m M 10 Ons 2 56S IT 4 Opspt Ch4 00m Et A Chi 47 Pr Pic LAS FOCUSSING POWER TO THE POINT Propagation delay 1 to 2 The typical propagation delay from input to start of current flow is typ 10 ns Additional 8 ns appear through the internal current monitor zoom 1 DO zoom 1 Ch4 100rn 10 0ne 100rn 10 0ne Description of the SUB D 9 Connector 3 SUB D 9 Connector GND GND BIAS POT1 2 BIAS POT1_1 15V Vcc _ _6 C EN _9 15VVcc Pic LAS FOCUSSING POWER TO THE POINT Power Supply 3 and Supply Absolute Maximum Ratings The laser driver supply can be interrupted at any time for e g safety reasons Pin of conn 3 Allowed range Best performance Destroying limit 7 and 9 15V Vcc 15 V 24 V 25 V ann mp mp Block Diagram LDS VRM 005 Block Diagram VCC BIAS POT Monitor Pic LAS FOCUSSING POWER TO THE PO
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