Driving dual switch PWM

[abudabit]

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?

 

[sreid]

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

 

[LionelHutz]

International Rectifier has some driver IC's for this.

 

[abudabit]

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.