[SOLVED] Proteus Ir2112 problem

[zaky.dzulfikri]

Hi all..
I tried to built half bridge using 2 irf540 mosfets and ir2110 as gate driver, but due to unavailability of ir2110 in proteus so I replaced it with 2112 instead, but the problem is that the HO doesnt respond any input in HIN, and any PWM input would just be ignored. I curious what is the problem with that and I hope you can give me solutions

 

[KlausST]

Hi,

A mosfet is controlled ON/OFF with it's Vgs.
Vgs means voltage between gate and source.

Therefore the driver IC need both these connections: gate and source of the Mosfet.
But you only connected gate to the driver.
--> connect mosfet_source to driver_Vs

This also is urgent for the bootstrap capacitor to be charged.

****
In real word your circuit will destroy itself. The motor is an inductive load, when the Mosfet is being switched OFF this generates high voltage spikes, killing the Mosfet.
--> use a free wheeling diode across the motor.

***
Dismiss R2. Or make it 100k, if you think you need it.
***
In a half bridge configuration D2 makes no sense.

Klaus