Nice. At that time, I thought it would be "safer" to use the MOS driver rather than a controller output. It was for a 2 phase unipolar stepper motor, a big one, 10A per winding maximum current and up to 200V per winding (100V each side of the center tap). I never actually tried to do without the MOS driver, but perhaps for a 10A drain current it would still be wiser to use the driver.
on Nov 26, 2013, petehand <[email protected]> wrote:
On Monday, November 25, 2013 1:15:31 PM UTC-8, Michel wrote:
Is that FET not warming up too much when you drive it directly from the AVR output?
The FET doesn't warm up at all. The only reason it would warm up is slow turn-off time - the turn-on time is already limited by the inductor - and the AVR has plenty of drive, it can sink more than 40mA in brief pulses. Since the FET only sees half the output peak there's much less Miller effect, and careful layout also helps reduce feedback capacitance. I've actually had this circuit running with an SOT-23 FET, generating 50V at 100mA for VFDs.--
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