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 work
Results:

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.

 

Hi Lad'
Please post your LTS asc file and any circuit models.
E

 

Hi Lad'
Please post your LTS asc file and any circuit models.
E

 

Hi Lad'
Please post your LTS asc file and any circuit models.
E

thanks for your response ericgibbs

 

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.