Adum1100 or HCPL-7723 for (high-side) isolators?

mzzj · 23rd March 2006, 11:27 PM

Is there any reason not to use ADUM1100 series magnetic couplers instead of fast opto like HCPL-7723?

IVX · 24th March 2006, 08:54 AM

Interesting idea, however adum1100 contain on-chip pulse transformer, which could be not enough stable if close to the switching stage.

mzzj · 24th March 2006, 01:33 PM

Quote:

Originally posted by IVX
Interesting idea, however adum1100 contain on-chip pulse transformer, which could be not enough stable if close to the switching stage.

That was my first tought also but...

Specs look promising, immune to magnetic field for example 5mm apart from conductor carrying 500khz at 1kA! Unless you put them between airgap of output inductor its hard to mess them up.

Pulse widht distortion is maybe bigger with ADUM-series because? of input schmitt-trigger/hysteresis.?

IVX · 25th March 2006, 07:41 PM

Well, It seems adum will ok too. BTW, why you don't like HCPL-7723, or usual cascode voltshifter even?

Jaka Racman · 27th March 2006, 07:26 PM

Hi,

I have just found Si8440 . Not necessarily better but interesting due to the use of 2GHz RF link for isolation.

Best regards,

Jaka Racman

IVX · 28th March 2006, 03:16 PM

Hi Jaka,
Si8440 wow, it seems fast enough, for subwoofer amp at least..

mzzj · 28th March 2006, 03:28 PM

Quote:

Originally posted by IVX
Well, It seems adum will ok too. BTW, why you don't like HCPL-7723, or usual cascode voltshifter even?

oops, forgot this..
I feel that cascode thing is more prone to blow up in high-power designs. And in some cases complete isolation of drive signals is nice to have.

HCPL-7723 looks fine exept bit expensive. Adumxxxx seems cheaper at digikey for example. Optocouplers in general have problems to withstand high dV/dt common-mode transients and archieve high speeds. HCPL-series is ok but expensive.

IVX · 13th May 2006, 05:17 PM

Quote:

Originally posted by mzzj
oops, forgot this..
I feel that cascode thing is more prone to blow up in high-power designs. And in some cases complete isolation of drive signals is nice to have.

oops, forgot this too..

I suspected a cascode in my project also, but the THD, measured yesterday, is pretty nice -.0044%@50Hz/220V/100W.

Seems, that cascode not so bad yet, in my case (370V 100KHz) at least.
To be honest, complete thing would be worse, because reference singen will be use Atmega8 with .007% THD own. (at moment EMU1212->amp->EMU1212)

phase_accurate · 13th May 2006, 09:08 PM

This is also some sort of magnetic coupler but working with a different principle than the Adum. It comes in singles and two kind of doubles. It is a little cheaper than the fast optocoplers with high transient-immunity.

Regards

Charles

23rd March 2006, 11:27 PM	#1
mzzj diyAudio Member Join Date: Jul 2005 Location: 65N 25E	Adum1100 or HCPL-7723 for (high-side) isolators? Is there any reason not to use ADUM1100 series magnetic couplers instead of fast opto like HCPL-7723?

24th March 2006, 08:54 AM	#2
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Interesting idea, however adum1100 contain on-chip pulse transformer, which could be not enough stable if close to the switching stage. __________________ Best regards, E1.

25th March 2006, 07:41 PM	#4
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Well, It seems adum will ok too. BTW, why you don't like HCPL-7723, or usual cascode voltshifter even? __________________ Best regards, E1.

28th March 2006, 03:16 PM	#6
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Hi Jaka, Si8440 wow, it seems fast enough, for subwoofer amp at least.. __________________ Best regards, E1.

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27th March 2006, 07:26 PM	#5
Jaka Racman diyAudio Member Join Date: Dec 2002 Location: Slovenia	Hi, I have just found Si8440 . Not necessarily better but interesting due to the use of 2GHz RF link for isolation. Best regards, Jaka Racman

13th May 2006, 09:08 PM	#9
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	This is also some sort of magnetic coupler but working with a different principle than the Adum. It comes in singles and two kind of doubles. It is a little cheaper than the fast optocoplers with high transient-immunity. Regards Charles

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