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Power Supply for high Powered Laser Diode

David Merrill
Intellectual 2305 points
Other Parts Discussed in Thread: TPS40211

The below question is for Aerius Technology in Los Angeles CA. 

I am currently attempting to design a power supply to drive a high powered Near Infrared Laser Diode. Right now using the Linear LT3741 which I cannot get to work.

Here are the specifications:

Constant Current, pulsed. Rise time <50us. 0à5A, (0à10A would be great!)

Vin: 12-24V

Vout: 2à6V with an adjustable upper limit (so as not to damage very expensive Laser Diodes.)

Can you please provide a part recommendation that would be a good fit for this application?

Thanks

 

  • 0
    TI__Mastermind 36110 points

    With the fast rise times and short pulse widths associated with a laser diode, you might consider driving the diode with a MOSFET that can turn on and off quickly.  You would use a current sense resitor and monitor it's voltage with a circuit that properly drives the MOSFET to achive the desired forward current.  TI has many power solutions to provide a 24V to 6V output at 5A.  Power Quick search at http://focus.ti.com/analog/docs/powerhome.tsp?familyId=64&contentType=4&DCMP=TIHomeTracking&HQS=Other+OT+home_p_power will show you the choices.  Also note that if your duty cycle ratio of on time to off time is  not 100%, the average current from the power supply will not need to be 5A.  For example, if you are turning your diode on at a 10% duty cycle, you only need a 500mA power supply.  You may be able to design a constant current power supply that meets the tranisent requirements.  The TPS40211 might be a good place to start.