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Class D Switching Power Amplifiers and Power D/A conversion

New Class D design
New Class D design
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Old 7th October 2007, 11:12 AM   #1
peranders is offline peranders  Sweden
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New Class D design
Default New Class D design

Anybody who have checkec this out?
http://www.irf.com/technical-info/re.../iraudamp4.pdf
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Old 8th October 2007, 08:40 AM   #2
phase_accurate is offline phase_accurate
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Old-fashioned non-post-filter NFB type amplifier.

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Old 8th October 2007, 09:13 AM   #3
IVX is offline IVX  Russian Federation
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Default Re: New Class D design

Quote:
Originally posted by peranders
Anybody who have checkec this out?
http://www.irf.com/technical-info/re.../iraudamp4.pdf

now the new is http://www.irf.com/technical-info/re.../iraudamp5.pdf
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Old 8th October 2007, 01:18 PM   #4
phase_accurate is offline phase_accurate
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Ahhhhh ! There is even a newer boring design without post-filter NFB !

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Old 8th October 2007, 07:35 PM   #5
Eva is offline Eva  Spain
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Hey, but look at the schematics, they have migrated to a phase-shifted self oscillating arrangement, in such a way that modifying it for post-filter feedback is trivial.

What they have done at IR is essentially a single-chip UcD solution It only lacks the balanced inputs...
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Old 9th October 2007, 07:41 AM   #6
phase_accurate is offline phase_accurate
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Quote:
in such a way that modifying it for post-filter feedback is trivial.


http://www.diyaudio.com/forums/showt...789#post825789

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Charles
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Old 9th October 2007, 08:18 AM   #7
Ouroboros is offline Ouroboros  England
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I've been looking at the IRS2092 data (as published so far) to see if it could be used to implement a UCD-style circuit. The input op-amp is internally coupled to the comparator stage, which is unfortunate, but the input op-amp is a transconductance amplifier, so it might just be possible to couple in the feedback to the op-amp/comparator junction to get a phase-shift 'UCD' style self-oscillator.

I've got a chap coming in to see me from 'Future Electronics' (A big UK distributor) tomorrow about this chip, so I'll try to scrounge a few parts to try it out.
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Old 9th October 2007, 08:44 AM   #8
IVX is offline IVX  Russian Federation
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Ouroboros, i've a doubts about such solution:
A) it seems ir ref. designs hasn't good precision of switching.
B) internal comparator isn't differential.
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Old 9th October 2007, 08:51 AM   #9
Ouroboros is offline Ouroboros  England
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Hello Ivan. Yes the fact that the comparator isn't differential is an issue. I've not had the time to study the chip yet, but at a glance it seems that to apply UCD style feedback directly into the input of the comparator would require that the feedback went to the + input of the comparator (which isn't accessible).
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