Author Topic: Complementary MOSFET Motor Controller  (Read 499 times)

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Offline hsn93

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Complementary MOSFET Motor Controller
« on: March 11, 2018, 06:40:27 am »

i was looking in pmos and while reading post in electronics-tutorial found this page:

the question is: the Vin has to be ( +vdd for logic 1 ) and ( -vdd for logic 0 ) right ?

as if it was for example ( TTL or cmos) the N mosfet will be on even the Vg was ground .. as the voltage at source is negative right ??

Offline rstofer

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Re: Complementary MOSFET Motor Controller
« Reply #1 on: March 12, 2018, 09:13:28 pm »
You got it right.

This is a particularly bad way to do the switching because it is going to be difficult to avoid shoot-through.  The N channel device turning off will overlap with the P channel device turning on and vice versa.

The MOSFET part is ok but the switching signals need to guarantee no overlap.

A full H-bridge is a better solution.

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