No Output Signal from H-bridge driver IR2104

[GrundE]

Hello,

I want to test the synchronous buck converter circuit using h bridge IR2104 as mosfet gate driver. I am simulating this in Proteus 8. Here is the details of my project :

Vsupply = Up to 80V
VCC = 12V
Fsw = 39khz

Ok let’s go to the problem.

The problem is IC IR2104 is not making output PWM signal from both pin (HO & LO). From the oscilloscope, you can see signal 1 is PWM from generator, signal 2 is HO and signal 3 is LO. Did i missing something?

 

[Delta Prime]

h bridge

Yes you are missing something...
First of all this is an H-Bridge. H does not stand for half. Your circuit is a half bridge.


Should we check your settings in proteus? What are your settings?

Is this homework?

 

[GrundE]

Update for the simulation, I just create another simulation project and it works. I don't know why only this is not working. For the setting, I only change the Animation SPICE from default to convergence.

For your question, this is a home project synchronous buck converter for mppt purposes. I have built one prototype but I don't understand why the buck converter is not working. Because I don't have oscilloscope so I can't analyze where the problem is. I made the almost same design using a reference from Tech Builder. Here is my schematic.