PWM input inversion

Discussion in 'General Electronics Chat' started by assassin___0, Mar 7, 2013.

  1. assassin___0

    Thread Starter New Member

    May 10, 2011
    19
    0
    The situation is this: I'm using a high speed optocoupler as a gate driver but it gives me high output with low input and vice versa. In order to invert my PWM input, this is the circuit I thought of putting before the optocoupler. By the way, the PWM input is 3.3V and the opto output will be 5V.


    My question is which transsitor should I use, BJT or MOSFET? The only thing i'm uncertain of is will the BJT perform well with high switching? But does MOSFET work in this configuration?

    If you can comment on the resistor values, whether they are ok or not, that would be helpful too.

    I think this is a straightforward question but let me know if you need any other info.
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    What frequency are you coupling?
    Duration of minimum pulse?

    Required rise time?
    Required fall time?
     
  3. assassin___0

    Thread Starter New Member

    May 10, 2011
    19
    0
    The switching frequency will be 100 kHz. I don't have a number for the other stuff.
     
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