Adum1100 or HCPL-7723 for (high-side) isolators? - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd March 2006, 10:27 PM   #1
mzzj is offline mzzj  Finland
diyAudio Member
 
Join Date: Jul 2005
Location: 65N 25E
Default 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?
  Reply With Quote
Old 24th March 2006, 07:54 AM   #2
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
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.
  Reply With Quote
Old 24th March 2006, 12:33 PM   #3
mzzj is offline mzzj  Finland
diyAudio Member
 
Join Date: Jul 2005
Location: 65N 25E
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.?
  Reply With Quote
Old 25th March 2006, 06:41 PM   #4
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
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.
  Reply With Quote
Old 27th March 2006, 06:26 PM   #5
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
  Reply With Quote
Old 28th March 2006, 02:16 PM   #6
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
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.
  Reply With Quote
Old 28th March 2006, 02:28 PM   #7
mzzj is offline mzzj  Finland
diyAudio Member
 
Join Date: Jul 2005
Location: 65N 25E
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.
  Reply With Quote
Old 13th May 2006, 04:17 PM   #8
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
Join Date: Jul 2003
Location: Everywhere (Buddhist's context)
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)
__________________
Best regards,
E1.
  Reply With Quote
Old 13th May 2006, 08:08 PM   #9
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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
High-Speed Digital Isolators? Ryssen Digital Source 2 20th December 2006 07:42 PM
High side driver ckt using ocs rejithcv Power Supplies 8 16th November 2006 02:52 AM
SMPS high side supply questions Danko Power Supplies 3 7th January 2006 09:12 PM
FAST high-side drivers/circuitry? mzzj Power Supplies 20 23rd December 2005 09:33 PM
Low side driver as a High side fr0st Parts 0 8th May 2004 02:14 PM


New To Site? Need Help?

All times are GMT. The time now is 09:07 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2