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Old 11th November 2006, 04:45 AM   #1
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Default High side driver ckt using ocs

It seems to be a crazy idea. I thought of using optocouplers as high side drivers. How do it look like? Do reply pls....
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Old 11th November 2006, 06:16 AM   #2
Eva is offline Eva  Spain
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Check it carefully, your schematic contains some catastrophic mistakes.
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Old 11th November 2006, 06:20 AM   #3
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Can u point out the problems pls?

This circuit wont work in any way?



-Thanks
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Old 11th November 2006, 06:44 AM   #4
Eva is offline Eva  Spain
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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...
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Old 11th November 2006, 02:44 PM   #5
VEC7OR is offline VEC7OR  Lithuania
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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.
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Old 11th November 2006, 04:06 PM   #6
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A P-Channel is in no way a choice. Is there any modification to drive the N channel itself?
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Old 11th November 2006, 04:10 PM   #7
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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..
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Old 15th November 2006, 04:54 PM   #8
DjLeco is offline DjLeco  Romania
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Default Solve!

Here's the solving of your problem
http://www.a-and-t-labs.com/K6_Sw_Amp/index.htm
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Old 16th November 2006, 02:52 AM   #9
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Hi dj,

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