High side driver ckt using ocs

[rejithcv]

It seems to be a crazy idea. I thought of using optocouplers as high side drivers. How do it look like? Do reply pls....

 

[Eva]

Check it carefully, your schematic contains some catastrophic mistakes.

 

[rejithcv]

Can u point out the problems pls?

This circuit wont work in any way?



-Thanks

 

[Eva]

The high side is all wrong, it could drive a P-channel MOSFET instead but then both sides would turn on at the same time...

 

[VEC7OR]

Optoisolators are slow and one way or another you'll need some kind of bootstap power supply to charge/discharge the upper side, its easier with gate drive transformer or a gate drive IC.

 

[rejithcv]

A P-Channel is in no way a choice. Is there any modification to drive the N channel itself?

 

[rejithcv]

Optocoupler seem to be quite fast in this application . Im having a lack of ir21xx series ic here and I also hate winding transformers. This is the only reason for a sudden forced design...

Thnk u all..

 

[DjLeco]

Solve!

Here's the solving of your problem
http://www.a-and-t-labs.com/K6_Sw_Amp/index.htm

 

[rejithcv]

Hi dj,

I had the schematic of that amplifier. It also uses gate drive transformers unfortunately