Electronics > Projects, Designs, and Technical Stuff
Driving P-Channel Mosfet
girishv:
Hi,
Here is the schematic for driving a motor using PWM at frequency of 5KHz.
The specifications of P-Channel MOSFET are
VDS 30V
VGS ±20
RDS 20mΩ @VGS -10V
Will it work for a 12V motor?
Benta:
It won't work at all. Your MOSFET's upside down.
T3sl4co1l:
What's Qgs(tot)? Or better yet what's the datasheet?
Tim
SiliconWizard:
Apart from the fact the PMOS is upside down (don't even try - it's not just that it won't work, but due to the body diode of the MOSFET, it will short-circuit pour power supply), this scheme is probably not the best for what you want to achieve. We'd need to know about the input capacitance of the exact transistor you're going to use, but with the 10k pull-up, @5kHz, switching losses are going to be pretty significant.
girishv:
--- Quote from: Benta on June 26, 2020, 05:46:24 pm ---It won't work at all. Your MOSFET's upside down.
--- End quote ---
I was stupid. I have revised the schematic and attached here.
--- Quote from: T3sl4co1l on June 26, 2020, 05:48:18 pm ---What's Qgs(tot)? Or better yet what's the datasheet?
Tim
--- End quote ---
Qgs 5.5 nC. Translated from Chinese language :)
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