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Old 15th April 2005, 06:48 AM   #1
djdamix is offline djdamix  France
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Default high speed optocoupler

Developping my PSU, I have trouble due to the delay of my optocoupler.
I ' m a using an HCPL2232 (optocoupler) with logic input and outputs acceptiong +15V. I am looking for a faster one (the 2232 has a delay of 200ns).

Any references are welcome !

David
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Old 15th April 2005, 11:10 AM   #2
subwo1 is offline subwo1  United States
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Hi djdamix, the 6N137 is rated at around 50nS propagation delay. I have found it to be a useful device.
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Old 15th April 2005, 02:15 PM   #3
djdamix is offline djdamix  France
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Thanks a lot. After different tries, my regulation is also limited by my driver propagation time (IR2110) which is about 150ns, do you a faster driver (with both high & low side if possible ).

thanks.
David
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Old 15th April 2005, 02:39 PM   #4
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Since you are using a high-speed optocoupler anyway you might use two low-side-drivers. IXYS for instance has damn-fast ones:

http://www.ixys.com/Appasp/pdicdr01.asp

They are significantly more expensive than the IR ones though.

Regards

Charles
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Old 16th April 2005, 03:10 PM   #5
tiki is offline tiki  Germany
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If you look for a small value of capacitive coupling and high dU/dt immunity, give the inductive coupling ADUM-devices of Analog Devices a try.
Regards, Timo
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Old 21st April 2005, 02:54 PM   #6
Kenshin is offline Kenshin  China
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a pair of 6N137 plus low side drivers / discreet buffers?

Something complicated, expensive, and slow compair to IR drives. BTW: GaAs LED inside 6N137 is a kind of enviromental pollutant.

If without IR drives, I'd choose capicator coupled N+P half bridge.
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