Hello spec, thanks again and as always I'm enjoying looking at your schematic and dissecting it to understand how it works.
Here is what I understand so far:
1- I the solution to the solution to the concern gophert's concern is to turn both + and - on and off at the same time so that there's no overlap and chance of shoot through.
2- When "clock" input has 18V+ or more (let's say 24) Q19 will turn on pulling the right side of M to ground.
3- And at the same time "clock"input will turn on Q21 as well and here is where I get lost. I can't figure out the voltage at the gate of Q16.
R13 and R14 form a voltage divider and with 32V+ supply line there will be almost 13V+ at the gate. The source of the mosfet is at 32 so the gate will be 19 volts more negative than the drain.
Is that enough to turn on the mosfet though the data sheet specifies absolute maximums of +-25V?
If it is enough, how do I come up with that number?
What is the function of the zener diode in this case? I tried simulating this part of the circuit and the value at R13 and R14 doesn't change with or without the zener diode. Of course I could measuring incorrectly.
4-What happens when Q21 is off and there's no current path for R13 and R14, what is the potential difference then at the gate/source of Q16
Cheers
Kal