High side driver ckt using ocs

rejithcv · 11th November 2006, 04:45 AM

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, 06:16 AM

Check it carefully, your schematic contains some catastrophic mistakes.

rejithcv · 11th November 2006, 06:20 AM

Can u point out the problems pls?

This circuit wont work in any way?

-Thanks

Eva · 11th November 2006, 06:44 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, 02:44 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, 04:06 PM

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

rejithcv · 11th November 2006, 04:10 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, 04:54 PM

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

rejithcv · 16th November 2006, 02:52 AM

Hi dj,

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

11th November 2006, 06:16 AM	#2
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Check it carefully, your schematic contains some catastrophic mistakes. __________________ I use to feel like the small child in The Emperor's New Clothes tale

11th November 2006, 06:44 AM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	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... __________________ I use to feel like the small child in The Emperor's New Clothes tale

11th November 2006, 02:44 PM	#5
VEC7OR diyAudio Member Join Date: Jul 2003 Location: Vilnius	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. __________________ Profanity took a very interesting form in Russia where there exists a language of sorts, most of its words based on four basic profane roots - nouns p...is, wh.0.e, c..t and verb f..k. It is possible to sensibly communicate using just these four basic roots.

15th November 2006, 04:54 PM	#8
DjLeco diyAudio Member Join Date: Oct 2006	Solve! Here's the solving of your problem http://www.a-and-t-labs.com/K6_Sw_Amp/index.htm

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11th November 2006, 06:20 AM	#3
rejithcv diyAudio Member Join Date: Oct 2006	Can u point out the problems pls? This circuit wont work in any way? -Thanks

11th November 2006, 04:06 PM	#6
rejithcv diyAudio Member Join Date: Oct 2006	A P-Channel is in no way a choice. Is there any modification to drive the N channel itself?

11th November 2006, 04:10 PM	#7
rejithcv diyAudio Member Join Date: Oct 2006	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..

16th November 2006, 02:52 AM	#9
rejithcv diyAudio Member Join Date: Oct 2006	Hi dj, I had the schematic of that amplifier. It also uses gate drive transformers unfortunately

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