Peter L. Peres wrote:
>>I am looking for a schematic for a known good high-current [1+ amps]
>>MOSFET driver built from discrete components. Any help appreciated.
>
>
> What is a full driver ? How fast ? Logic level or higher ? The simplest is
> a NPN/PNP push-pull stage. Of course it has no voltage gain.
>
> Peter
>
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Hi Peter,
a good driver would run from 5v logic requiring <15mA of drive current
from the micro, switch a 5nF capacitance in 100nS to 12v and 0v. The
circuit that Russell McMahon sent me works pretty well. 2 NPN
transistors, 1 PNP, 2 resistors + 1 gate drive resistor. It's switching
15 volts driving a .01uF load in about 150nS, so it should work pretty
well for my high power 75khz flyback converter. It'll be driving two
IRF1405 MOSFETs with current peaks at 42 amps.

--
--
Martin Klingensmith
http://infoarchive.net/
http://nnytech.net/

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