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Another solution to drive an N-channel MSOFET with the load going to GND is to use a hi/lo gate driver such as IRS2001, LM5101, FAN7842 (all come in an 8-pin packages). They provide sufficient gate drive current and will allow you to PWM at pretty high frequencies - up to 1MHz depending on the application. I typically use them at 5-50KHz. Also, because they have hi and lo side drivers, they are very useful in bridge type situations using N-channel MOSFETs only.
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Hi,
Or output 50% PWM signal to drive the fet ... via a simple voltage doubler - or more - ( diodes + capacitors )
Hi, Sayzer
not so good for high current load ...
you'll drop at least 3 v in your Mosfet ( Vgs on + Vbe BC 337 + V diode ! ) ...
Bootstrap only works at "firing" the Mosfet ... not while steady conduction ...
Alain
Last edited by Acetronics2; - 21st September 2008 at 14:11.
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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