high speed optocoupler

[djdamix]

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

 

[subwo1]

Hi djdamix, the 6N137 is rated at around 50nS propagation delay. I have found it to be a useful device.

 

[djdamix]

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

 

[phase_accurate]

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

 

[tiki]

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

 

[Kenshin]

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.