A
Andrew Holme
Guest
Danny T wrote:
transistors. MOSFETs are either: N-channel, or P-channel.
low.
The high-side transistors are tricky to drive when the motor runs off a
different voltage to the controller. You might be better off looking
for a monolithic high-side driver like Anthony suggested.
Yep, that's an H-bridge; using bipolar transistors.Andrew Holme wrote:
No, that won't work. The power supply would short-circuit through
a
diode and a MOSFET. You have to use the H-bridge configuration:
http://www.google.co.uk/search?q=motor+mosfet+%22h-bridge%22
Thanks Andy. Found this:
http://www.dprg.org/tutorials/1998-04a/hb6.png
You need P-channel MOSFETs. The terms NPN and PNP apply to bipolarSo do I just need some PNP mosfets the same as the NPN ones I already
have?
transistors. MOSFETs are either: N-channel, or P-channel.
Only via an inverter: the high-side MOSFETs turn-on when the gate isIs it possibly to drive two MOSFETs (the PNP from one side, and
NPN from the other) from the same IC pin?
low.
The high-side transistors are tricky to drive when the motor runs off a
different voltage to the controller. You might be better off looking
for a monolithic high-side driver like Anthony suggested.