I'm designing a type of a buck converter which has the following circuitry.
Simulation runs fine on PLECS and I've added three bootstrap connections to drive these high-side MOSFETs (All top three except
FETD2). Simulation results to capture voltages across those capacitors is as follows;
I have following questions to clarify before I build this circuit on a PCB.
- Is the voltage between each gate to source is enough to drive each MOSFET (Probably a Logic type MOSFET)?
In simulation, when I use the same 12V source to bootstrap circuit, it throws an error "Cyclic behavior during switching". But when I use a separate source as in the schematic, it works fine. Can't I really use the same source for all bootstrap connections?
Also the PWM frequency needs to be at 1 MHz. Has anyone used a driver circuit which can work at such high frequencies and got good results?
Thanks in advance :)