- #1
Crazymechanic
- 831
- 12
Hey guys could you help me out , so I have built this simple smps project that i needed to the multivibrator part works great frequency is stable square wave but then I have these power mosfets IRFP460 , now the multivibrator has two output each 180 opposite to the other I use each of these outputs to drive two of these n channel mosfets the problem is when i switch the transformer and then try to switch the apparatus in it, the square wave in the multivibrator dies off and turns to a flat dc about zero volts line.
Well I'm assuming either one of two things or both , one could be that the current in my multivibrator is too little and when it tried to charge the gate it just sags down and the multivibrator stops generating., the other is that maybe i need to use a small capacitor in the gate drive path rather than a resistor?
I don't know what's your thoughts on the subject?
P.S. I apologize for the blurred schematic it was just late and i had no better paper or camera around. :)
Well I'm assuming either one of two things or both , one could be that the current in my multivibrator is too little and when it tried to charge the gate it just sags down and the multivibrator stops generating., the other is that maybe i need to use a small capacitor in the gate drive path rather than a resistor?
I don't know what's your thoughts on the subject?
P.S. I apologize for the blurred schematic it was just late and i had no better paper or camera around. :)