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Old 9th April 2013, 10:06 AM   #3421
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Delta sigma however requires high order modulators in order to push noise out of the audio band which calls for complex circuits of several comparators and integrators in series, so for simplicitys sake i prefer UcD over delta sigma.

Basically post filter feedback from what i've seen over the years on this forum is the way to go for self oscillating class d amplifiers, wheres clocked designs is a waste of time.
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Old 9th April 2013, 02:40 PM   #3422
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Selfoscilating and pre+postfilter with 8th order output filter is gold (for me).
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Old 10th April 2013, 10:09 PM   #3423
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well as on the board or as a diagram? I apologize for machine translation.
правильно как на плате или как на схеме ? Прошу прощения за машинный перевод.
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Old 11th April 2013, 03:34 PM   #3424
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Hi Tekko,

You can add external freq. to sigma-delta design if you want, still it is low noise one

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MANOJ
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Old 11th April 2013, 04:04 PM   #3425
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From what i read, post filter feedback has advantages above pre filter feedback such as beeing load invariable, ie the switching frequency is defined, not 200kHz for a 2 ohm load and 600kHz with a 8 ohm load and 400kHz with a 4 ohm load and such like pre filter feedback topologies. As well as beeing flat over the 20-20000Hz audio band instead of only beeing flat at the designed load impedance wheres on 8 ohms freq response peaks at higher frequencies and ohm 2 ohm load freq response starts drooping at a lower frequency than on 4 ohms.

Atleast this is what i read, assuming its not just marketing bullsh*t by Hypex to boast their UcD sales.

Maybe Bruno himself has some input on this ?
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Old 11th April 2013, 04:25 PM   #3426
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Hi Tekko,

I think pre filter feedback is not a NF its only for freq. locking for fsw and it is not affected with audio band and if need NF(Negative Feedback) use post filter feedback.

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Old 11th April 2013, 04:50 PM   #3427
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I take it you do not like the UcD topology that relies on post filter feedback for the self oscillation itself.
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Old 15th April 2013, 02:58 AM   #3428
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Default IRS DCLASS

Sameerx1 dclass finally being packed with smps supply
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Old 15th April 2013, 01:09 PM   #3429
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My all amplifiers tested successfully on full night of 14 april

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Old 15th April 2013, 03:27 PM   #3430
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My all amplifiers tested successfully on full night of 14 april

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