hi guys.
I made a mosfet driver with stp36nf03 and ir2111 mosfet driver, but it doesn't working, the hi and lo output doesn't change when input pin was supplied by a pwm of arduino board with 5 volt, but when i choose 12 volt changes, the vcc pin is supplied by 12 volt, any body can help me?

 

Post a schematic.

 

One common oversight is that the lower Mosfet has to be on for the VB to occur for the upper Mosfet to switch.
Max.

 

Post a schematic.

 

One common oversight is that the lower Mosfet has to be on for the VB to occur for the upper Mosfet to switch.
Max.

yes.you are right.but the lower mosfet was on and vs connected to gnd.that is why the HO output had 0 level.In normally mode IR2111 has pull down and it causes that LO has 12 volt and turns the lower mosfet on