No. Are your wiring and FET orientation correct? Is the FET gate-source shorted?As soon as solder in the transistor the gate signal is disapear. Is this a normal behaviour?
I trust that's an error in your diagram. you show the junction of the drain and source shorted to 0 volts! Your 10K gate resistors should be more like 10 to 100 Ohms, depending.Just checked the continuity between gate source and its open (no short).
On the board between gate-source its open as well.View attachment 281287
In your diagram there is a line connecting the COM pin to the 100nF capacitor, and then to the common connection between the 2 MOSFETS. It starts at what looks like a ground symbol!@sarahMCML
Acknowledg for the resistors ohm value.
I don’t understand where you are seeing drain and source shorted to 0volts?
Yes, for push-pull operation.Shouldn’t the two source connected to ground also ?
You are absolutely correct! I've been so absorbed with H-bridge drivers for the last few weeks that I totally missed the fact that the lower MOSFET was upside down.The 100n cap is not necessary, but simulation with LTspice suggests that the diode from Vcc to Vb is needed nevertheless.
SarahMCML is perhaps thinking the FETs are in the standard half-bridge drive configuration, rather than a push-pull configuration?
Yes, for push-pull operation.
by Aaron Carman
by Duane Benson
by Duane Benson