Laser diode driver

Discussion in 'The Projects Forum' started by minh, Oct 26, 2015.

  1. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    Dear All..
    I intend to use PWM circuit for driver laser diode from 5mw(2volts) increase to with PWM 10mw(6volts) or more but some people have told me it will reduce the lifespan of device So could you help me to know this advice is true or not
    Many thank you.
     
  2. #12

    Expert

    Nov 30, 2010
    16,321
    6,818
    Basically true. Run anything at twice the power it is designed for and it will fail soon.
     
  3. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    You probably need to filter the PWM to get steady DC, and sense current through the LD as the main influence for controlling the mark space ratio.
     
  4. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    Dear ianfield
    Thank you very much for your help
     
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