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Driving dual switch PWM

Driving dual switch PWM

Driving dual switch PWM

(OP)
I'm pretty new to PWM design, and I haven't seen any examples of how to drive a dual switch PWM.  Every example I've seen seems to only drive a single mosfet tied to ground.  No matter what I do I can't seem to get the switches working, at least in the simulator.  



What I want is both switches to turn on at the same time, turn off at the same time.  But I can't even get them to turn on.  What do I need to do in this situation?
 

RE: Driving dual switch PWM

One way is to create a floating 15 VDC power supply referenced to Q3's Source and use an Avago Optically Isolated Gate Driver.

RE: Driving dual switch PWM

International Rectifier has some driver IC's for this.

RE: Driving dual switch PWM

(OP)
Thanks for the tips guys.

IR2103 (high side low side driver) looks like it should work great.  Can't find a regular spice model for it though.  Tried using the pspice model that IR provides but it makes multisim crash.

Guess I'll order them and bread board it to see if I have the layout correct.

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