User Manual - Schulz Electronic GmbH
Contents
1. PIC LAS 2 VV User Manual ected LDP VRM 01 12 CA preliminary Manual PicoLAS GmbH Company for Innovative Power Electronics und Laser Technology Schulz W Electronic KaiserstraBe 100 52134 Herzogenrath Tel 49 0 2407 563 58 0 Schulz Electronic GmbH Dr Rudolf Eberle Strake 2 Fax 49 0 2407 563 58 29 0 76534 Baden Baden Fon 49 7223 9636 30 E Mail info picolas de Fax 49 7223 9636 90 vertrieb schulzset ctronic de We b WWW p i CO l as d e www schulz el ctronic de PiIc LAS FOCUSSING POWER TO THE POINT How to use the Manual A Remark Please refer to chapter Power dissipation for more details about the thermal power losses during operation Before powering on your unit read this manual thoroughly and make sure your understood it fully A 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 1 0 A Operating temperature range 0 C 60 C Best performance operating temperature range 10 C 35 C Storage temperature range 20 C 70 C Dicel At FOCUSSING POWER TO THE POINT Dos and don ts Never ground any output connector OQ Never use any ground2. Input 3 The analogue set point signal is provided via connector 3 The output current follows the input signal proportionally within the driver s limitations bandwidth max current rise time Jumper The analogue input can be switched to an inverted digital input Set the jumper on left to activate the inverted digital input Current Monitor 5 The scale of current monitor is scaled with 0 5 V A Dicel At FOCUSSING POWER TO THE POINT Description of the bias and scaling potentiometers The bias potentiometer sets a dc output current up to 0 75 A which is added to the input signal Turn it right to increase the bias current The scaling potentiometer varies the scaling of input signal Turn it right to increase the scale from 0 A V to 0 2 A V lt J Sealing OV Z NU oy l Bos Output current wW Test Load For the first test an appropriate test load may be assembled instead of the laser diode This test load can either be a short circuit or a schottky diode like the ES3C Please connect the test load only between anode and cathode LD and LD and prevent shorts to any other parts of the circult Power Dissipation The control of the driver reduces the power dissipation automatically to a minimum The driver doesn t need to be cooled and have a maximum power dissipation of 2 2 W Mechanical Dimensions The following dimensions are in millimetres mm width 20 length 32 height 13
3. ed 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 possible 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 Laser diode Power Supply Vcc Current monitor The basic settings Scaling and BIAS Current etc can be adjusted by potentiometer Bias set a dc output current up to 0 75 A without connecting input signal You need an additional waveform generator which has to be connected to the input terminal There is no AWG included within the driver Step What to do Check 1 Solder a dummy diode between LD and LD Refer to chapter Test Load alternatively make a short circuit there range of compliance voltage OV 12 V 2 Connect GND VCC on Power connector Range of Vcc 12 V 20 V power source disabled Required max current is about 1 2 A 3 Connect waveform generator on input terminal Refer to all chapters referencing Input no pulse before power supply enabled Connector 2 4 Enable the power source 5 Adjust scaling and bias See potentiometer for scaling an bias 6 Feed a signal on the input terminal For Make sure not to overload the laser example 1Khz sine wave with 1V amplitude diode or the dri
4. ver Range of input signal O V 5 V 7 Monitoring of the output current On current monitor you can measure a signal comparable with the input signal Use an oscilloscope with a 1 MEG ohm termination Scale 0 5 V A 8 Disable the input signal and turn off the power SOUIce Remove the test diode or bypass and assemble the final laser diode 9 Turn the power supply for the Vcc back on Range of Vcc 12 V 20 V 4 PiIc LAS FOCUSSING POWER TO THE POINT 10 Feed a signal to the input terminal Make sure not to overload the laser diode Required laser diode pin out The LDP VRM 01 12 CA is designed for the direct connection of almost any kind of laser diode The solder pads accept 2 and 3 terminal packaged Laser Diodes Pitch of the LD and LD connections is 3 5 mm Power driver block diagram D SS egene D Measurement k Jumper Inout UK 3 n aZ Contol Inverter A Unit Measurement Monitor PiIc LAS FOCUSSING POWER TO THE POINT Description of the connectors of the LDP VRM 01 12 CA Connector Function Cd Power connector Vcc Screw terminal Power connector GND for VCC and input signal Power connector input signal Dicel At FOCUSSING POWER TO THE POINT Power supply 1 3 and supply absolute maximum ratings Pin of conn 3 Allowed range Best performance Destroying limit 1 Vcc laser supply 12V 20V 3 V above 25 V compliance mn mp Seen ov
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