high speed optocoupler

djdamix · 15th April 2005, 06:48 AM

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 · 15th April 2005, 11:10 AM

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

djdamix · 15th April 2005, 02:15 PM

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 · 15th April 2005, 02:39 PM

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 · 16th April 2005, 03:10 PM

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 · 21st April 2005, 02:54 PM

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.

15th April 2005, 06:48 AM	#1
djdamix diyAudio Member Join Date: Jun 2004 Location: Lyon	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

15th April 2005, 11:10 AM	#2
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	Hi djdamix, the 6N137 is rated at around 50nS propagation delay. I have found it to be a useful device. __________________ USMPS http://groups.yahoo.com/group/switchmode/

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15th April 2005, 02:15 PM	#3
djdamix diyAudio Member Join Date: Jun 2004 Location: Lyon	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

15th April 2005, 02:39 PM	#4
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	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

16th April 2005, 03:10 PM	#5
tiki diyAudio Member Join Date: Feb 2004 Location: Dresden	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

21st April 2005, 02:54 PM	#6
Kenshin diyAudio Member Join Date: Jan 2005 Location: China	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.