Help on Optocoupler Gate Drive

Discussion in 'The Projects Forum' started by min, Oct 13, 2010.

  1. min

    Thread Starter New Member

    Sep 7, 2010
    2
    0
    Hi,
    I need help on the Avago HCLP-316J optocoupler Gate Drive.
    Connect my circuit based on the datasheet recommended application circuit. But i did not connect any IGBT in first and without the Ddesat (100ohm and diode) at the Ddesat pin.
    I want to see the Vout (VGE) have a output signal of +15V and -5V which frequency follow my Vin+ frequency.
    Now the problem is the Vout output signal is +15V to -5V, frequency following the Vin+ frequency but not the duty cycle. The high side duty cycle always remain at 500ns.
    What's wrong at this circuit?
    Please advise.
    Thanks.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You eliminated the charge pump portion of the circuit. It's not going to work very well without it, if at all.
     
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