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Old 14th April 2018, 11:33 AM   #1321
IVX is offline IVX  Ukraine
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that's looks better, however, SMPS is too weak for a peak current ability. As I like to say - it is not HiFi
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Old 14th April 2018, 01:55 PM   #1322
irs20957 is offline irs20957  China
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Thought and left one amp TPA3255. Configured in 2.1, PSU 45V
Added 3 cap 4700x50, ripple current 3355 mA = 10A
+ 6x680uf SXE nippon chemi-con, 1100 mA per cap = 6,6A
Enough for 200W+2x50W max.
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Old 14th April 2018, 02:52 PM   #1323
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it's too optimistic, in fact, your rail will drop from 48V to 23V and less during 1/10S even if the load is 2ch 4ohm. For instance, Pro audio standard power rollback is 2S, that's enough in the most case of music content but this is a far away not HiFi, it is compromising approach for musicians and stage. Your setup is 20 times worse( 2S/.1S = 20), the power drops 6 times first 200mS, does exist any reason to not use a decent SMPS?
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Last edited by IVX; 14th April 2018 at 03:00 PM.
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Old 14th April 2018, 03:09 PM   #1324
irs20957 is offline irs20957  China
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My loads 2x8 ohm +1x4 ohm, 2xSE output + 1 BTL output, see datasheet
Total output power is less 300W
I have Hypex SMPS400A100, output voltage is low, only 36V, little for TPA3255.

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Old 14th April 2018, 03:19 PM   #1325
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I'm not familiar Hypex products, sorry. You simply need more amperage SMPS for you amps that's it. Such simple things are very easy to calculate/simulate, don't underestimate this approach.
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Old 14th April 2018, 03:31 PM   #1326
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Quote:
Originally Posted by IVX View Post
For instance, Pro audio standard power rollback is 2S
Do you propose for a power of 300 watts to use a 600 watt PSU?
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Old 14th April 2018, 03:41 PM   #1327
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Yeah, as usual, but you have a second option - a lot of alcaps for averaging the current ripples. For example, in my HiFi TOY design I've no room for a big caps tank, hence, I going with over-beefy SMPS mosfets (22A when <=10A looks more reasonable by a first glance).
PS: actually, Hypex SMPS is an audio product so its 35V would be MUCH more than your 48V with industrial SMPS.
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Last edited by IVX; 14th April 2018 at 03:49 PM.
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Old 14th April 2018, 04:14 PM   #1328
irs20957 is offline irs20957  China
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IVX thank you for help. I will use a lot of alcaps.
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Old 14th April 2018, 04:16 PM   #1329
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No problem.
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Old 16th April 2018, 01:13 AM   #1330
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