On Wed, Mar 16, 2011 at 9:33 AM, Ing. Marcelo Fornaso wrote: > I tried, but it's hard to imagine without a drawing... > I'm checking the web but didn't find any related circuit yet. > > Could you produce some simple schematic, please? > > Thank you. > > Marcelo Fornaso > http://lkeng.org/mosfet.pdf If you need to boost the current you can do one of Fig. A or C, however you want to absolutely ensure that your PNP transistors can handle the peak current. Not all can, and will fail spectacularly. It is also very important to have very low inductance paths for gate drive current. Fig. B is for asymmetric gate drive because your MOSFETs will turn off slower than they turn on if you just use a single resistor. Take note that typical through-hole parts are very large and will have significantly higher inductance than SMT parts. Also it would be wise to use resistors that are rated for the peak pulse currents. Unless I had a good reason to do so, I would use a gate drive chip like the FAN7390 instead of boosting the current with discrete parts. The required discrete transistors to handle the pulse currents are expensive. --=20 Martin K. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .