High side driver control- Negative voltage by switching-off

Thread Starter

Ladhibi1

Joined Oct 24, 2023
5
Hello dear friends and colleagues,
Iam developing a half bridge driver and i faced the problem of Parastic turn on of the low side MOSFET i would like to turn off the high side mosfet with - voltage but iam facing problem since the Source of the high side mosfet is floating, any suggestion please?
I developed this spice model but it won't work1705829662450.png
Results:
1705829698872.png
Blue: Vd of high side MOSFET
Green: Vs of high side MOSFET
Red: Vds - drain source of HS Mosfet
light blue: Vds of low side MOSFET
Any help or/and suggestion would be much more appreciated.
 

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ronsimpson

Joined Oct 7, 2019
3,037
Gate Drivers must connect Gate to Source on the MOSFET. They will not work Gate(s) to ground.
There are bridge gate drivers that will drive 2 or 4 gates like you want, using all N-MOSFETs not P and N.

Here is an example. This one has no isolation.
You can't see it but inside the IC there is a diode from VDD to HB to make a floating supply.
1705847438811.png
 
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