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Class D Switching Power Amplifiers and Power D/A conversion

TI Class D EVM Board 50% Promotion
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Old 18th September 2018, 05:40 AM   #301
jimk04 is offline jimk04  United Kingdom
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Join Date: Jul 2018
Ordered mine on the 9th September. Still 'in work..?!

So if I want to use it in 4 channel or 2.1 mode. Where do I connect the speaker negatives?!
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Old 18th September 2018, 07:55 AM   #302
Yatsushiro is online now Yatsushiro  France
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Join Date: Mar 2016
Location: Normandie, France
I assume you ordered the TPA3255EVM? This is one of the more popular EVMs available, and is sometimes out of stock. I suspect that when this happens, instead of making more, they call some back from the distributors (Mouser, Digikey etc), who only sell them at full price.

If you haven't done so already, download the EVM manual/Users guide; this covers all configurations etc...
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Old 18th September 2018, 07:58 AM   #303
jimk04 is offline jimk04  United Kingdom
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Join Date: Jul 2018
Yes ordered from The Ti Store

I have the EVM pdf but I don't really understand the schematic of how to connect th3 speakers as such. What do I ground them to? And is that a capacitor on the ground connections?

Sorry. I'm not good with electronics!

Last edited by jimk04; 18th September 2018 at 08:20 AM.
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Old 18th September 2018, 10:10 AM   #304
linuxfan is offline linuxfan  Australia
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Join Date: Dec 2007
Quote:
Originally Posted by jimk04 View Post
So if I want to use it in 4 channel or 2.1 mode. Where do I connect the speaker negatives?
For the stereo speakers of a 2.1 configuration, the positive speaker connections are OUTC and OUTD. The common negative speaker connection is J20.
Configure the board according to section 3.1 of the User Guide.

For 4 channel SE mode, you can follow the same pattern for OUTA and OUTB - their negative speaker connection is J11.
Configure the board according to section 3.3 of the User Guide.
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Old 18th September 2018, 12:11 PM   #305
jimk04 is offline jimk04  United Kingdom
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Join Date: Jul 2018
Ah that's much clearer. Thank you.
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