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Old 11th January 2016, 01:00 AM   #1
Jerms is offline Jerms  United Kingdom
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Default Chromecast Audio plus Class D amp, how to power them?

...Going into a small box in the Kitchen to hang on the wall. Ideally, I want one power cord entering the box rather than relying on a trailing socket, laptop PSU, USB power supply and wirey mess.

I need two DC voltages, 15-16V for a TPA3116 and 5V for the CC-Audio.

Assuming I'm buying PSUs off eBay etc, what's the better way?

a) One 15V SMPS for the TPA3116 and add a DC-DC buck to provide 5V for the CC-A.

or

b) One 15V SMPS for the TPA and another SMPS giving 5V for the CC-A?


Space in the box is not an issue. It should form a centre panel in between two wall hanging speakers. Only real restriction is the height of 2" or 50mm.

Cheers,

J.
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Old 11th January 2016, 04:01 AM   #2
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The TPA3116 datasheet says that the source voltage can be as low as 4.4V. Couldnt you use 5V power then for that as well as with CC ?
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Old 11th January 2016, 04:40 AM   #3
DUG is offline DUG  Canada
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Option A

12-24V supply and a V7805-1000 for 5V 1A @ 88-93 % efficiency.

V7805-1000 CUI Inc. | Power Supplies - Board Mount | DigiKey

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Old 11th January 2016, 04:55 AM   #4
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by dearchap View Post
The TPA3116 datasheet says that the source voltage can be as low as 4.4V. Couldnt you use 5V power then for that as well as with CC ?
It wouldn't make the required power. I make it under 2 watts into 8 ohms at 5V.
So a common 5V supply seems to be out...

J.
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Old 11th January 2016, 05:02 AM   #5
Jerms is offline Jerms  United Kingdom
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Join Date: Jun 2015
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Quote:
Originally Posted by DUG View Post
Option A

12-24V supply and a V7805-1000 for 5V 1A @ 88-93 % efficiency.

V7805-1000 CUI Inc. | Power Supplies - Board Mount | DigiKey

I have a LM2596 buck. I guess that might do it.
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