H-Bridge with level shift - MOSFET gate voltage issues?

But in this case the RFI isn't harmonics of 60Hz. It's harmonics of the parasitic elements of the switching circuit.

Reply to
krw
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I gave you a TI part, DRV8871, .565ohm rds, 45 v, 3.5a and you can get a breakout board from adafruit for $7.50USD

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Chisolm 
Republic of Texas
Reply to
Joe Chisolm

"Parasitics elements " don't have harmonics, frequencies do.

In this case the PWM waveform is nominally a square wave which has odd harmonics whose amplitudes decline in proportion to the harmonic number. If the square starts off faster than 60Hz, the harmonics are going to bigger.

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Bill Sloman, Sydney
Reply to
bill.sloman

Thanks, indeed a very interesting part. But I don't see your other posting where you gave it to me. On my end this is the first message from you.

Best regards, Piotr

Reply to
Piotr Wyderski

easy to get lost in all the post. pardon my tying mistakes. sliced my finger before the holidays so i'm still one handed typing for a while.

If you are still thinking about rolling your own, the FDC5614P is a logic level P. 60V, 3A, Vgs -1.6 NTF3055L108 - logic level N channel

60V 3 A Drive them from gpio pins on the Pi. dont remember if the PI gpio has pull up or down. watch for that on the gate drive.
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Chisolm 
Republic of Texas
Reply to
Joe Chisolm

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