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Summary of Contents for PICOLAS LDP-CWL 06-20
- Page 1 User Manual LDP-CWL 06-20 LDP-CWL 12-20 - Preliminary Manual - PicoLAS GmbH Burgstr. 2 52146 Würselen Germany Phone: +49 (0) 2405-64594-60 Fax: +49 (0) 2405-64594-61 E-mail: info@picolas.de Web: www.picolas.de Rev. 2001...
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Page 2: Table Of Contents
How to use this Manual ....................4 Dos and Don’ts ......................4 Required Laser Diode Pin Out..................7 Laser Driver Block Diagram ..................7 Description of the Connectors of the LDP-CWL 06-20 / LDP-CWL 12-20....8 Working Areas and Power Dissipation ...............11 Frequency Response ....................14 Trigger Delay.......................15 Test Load ........................16... -
Page 4: How To Use This Manual
How to use this Manual Remark:=The LDP-CWL 06-20 and LDP-CWL 12-20 described in this manual are base plate cooled laser diode drivers. Improper cooling may cause an internal overtemperature shutdown. Base plate cooling:=Depending on the final application and operation mode, this unit may stay non-cooled or must be assembled onto a heat sink. - Page 5 How to get started LDP-CWL driver with connectors, jumper and measurement points The basic settings such as maximum current setting for the crow-bar can be adjusted by the potentiometer. The actual adjusted maximum output current can be measured at MP1 (measurement point 1). An additional waveform generator might be needed which has to be connected to the input terminal.
- Page 6 Step What to do Check Connect a dummy diode between LD+ Refer to section “Test Load”. and LD-. Alternatively make a short Range of compliance voltage circuit there. 0 V .. 20 V. Set the working point of the LDP-CWL. There are three different working points: pulse mode, modulation mode and cw mode.
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Page 7: Required Laser Diode Pin Out
Required Laser Diode Pin Out The LDP-CWL 06-20 / LDP-CWL 12-20 is designed for the direct connection of almost any kind of laser diode with a maximum compliance voltage of 20 V. The pitch of the LD+ and LD- connectors is 15.5 mm. -
Page 8: Description Of The Connectors Of The Ldp-Cwl 06-20 / Ldp-Cwl 12-20
Description of the Connectors of the LDP-CWL 06-20 / LDP-CWL 12-20 Connectors of the laser driver Connector Function Description Power connector: Vcc Screw terminal M3 Power connector: GND for Vcc and input Screw terminal M3 signal Pin header See section “Connection Pin header”... - Page 9 #1 and #2. Power Supply absolute maximum Ratings Allowed range Best performance Destroying limit 1 Vcc 15 V .. 48 V 10 V above 49 V (laser supply) compliance 2 (GND) #3. Connection Pin header Function number N.C. +5 V V compliance N.C.
- Page 10 (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.
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Page 11: Working Areas And Power Dissipation
Working Areas and Power Dissipation To cover many different working areas of the LDP-CWL, the driver has the possibility to change the internal working area for the most suitable operation. The LDP-CWL can be set in three different working areas continuous wave mode (cw), modulation mode (Mod.) and pulse mode (Puls.). - Page 12 In the pulse mode the LDP-CWL can modulate any signals according to its specifications e.g. bandwidth, linearity, output current. The LDP-CWL provides in this mode rise times higher 9 µs at an output current of 12 A. To avoid distortion and achieve a higher slew rate please use the Modulation Mode.
- Page 13 LDP-CWL 12-20 can achieve rise times less than 9 µs at an output current of 12 A and LDP-CWL 06-20 can achieve rise times less than 25 us at an output current of 6 A. With the potentiometer 2 (adjust Vdc_link, measurement point 2; refer to section “How to get started”), the DC link voltage can be adjusted (refer to section “Laser Driver Block...
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Page 14: Frequency Response
Frequency Response The following graph demonstrates the 3dB bandwidth for increasing output current values of the LDP-CWL 06-20. The following measurement results are made on a dummy diode with a compliance voltage of 10 V. 60,00... -
Page 15: Trigger Delay
Trigger Delay The delay between the triggering signal and the load-current is typically td=2.2 µs. -
Page 16: Test Load
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 dummy diode load. Please connect the test load only between anode and cathode (LD+ and LD-) and prevent contacts to any other parts of the circuit. -
Page 17: Mechanical Dimensions
Vcc limit: The input voltage is in the range of 15 V .. 48 V but at least 10 V above compliance voltage Output current: 6.0 A / 12.0 A (LDP-CWL 06-20) (LDP-CWL 12-20) Operating temperature range: 0 °C .. +55 °C Operating temperature range for best performance: +10 °C .. +35 °C storage...
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