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rejithcv 11th November 2006 05:45 AM

High side driver ckt using ocs
2 Attachment(s)
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 11th November 2006 07:16 AM

Check it carefully, your schematic contains some catastrophic mistakes.

rejithcv 11th November 2006 07:20 AM

Can u point out the problems pls?

This circuit wont work in any way?


Eva 11th November 2006 07:44 AM

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 11th November 2006 03:44 PM

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 11th November 2006 05:06 PM

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

rejithcv 11th November 2006 05:10 PM

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 15th November 2006 05:54 PM

Here's the solving of your problem

rejithcv 16th November 2006 03:52 AM

Hi dj,

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

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