Help needed with MOSFET Pull-up Pull-down Control

161

01:10:22

I am trying to drive this MOSFET which is meant to control a 100V load. Given that the gate threshold voltage is 4V and 10V potential difference across VGS is controlled by a simple Zener diode, I am struggling with maintaining a 10V potential at the gate and I think that the Pull-up BJT is responsible as the VCE is as high as it were to be for the off-state condition of the control transistor (while the logic signal is high anyway). Can anyone please solve this chicken neck for me?

Edit: I have sorted the problem temporarily. Apparently changing the logic level of the gates and the logic signal somehow directly drive the output voltage of logic BJTs (even if I try using logic MOSFETs in the place). I still didn't fully figure out why this is happening though. Any help would be appreciated.

published 1 year ago

evecute

1 year ago

Go to width of the mosfet setting and change the value to 50 um, your sircuit is working perfect.

BigArc

1 year ago

Thanks. I have sorted the problem temporarily. Apparently changing the logic level of the gates and the logic signal somehow directly drive the output voltage of logic BJTs (even if I try using logic MOSFETs in the place).

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