My TPA3123 25+25W bridge proto-amp

[macky]

just wanna share my jungle-like proto of TI's Class D chip TPA3123 [25W+25W] bridged amp, this sounds great!

The bridging adapter:

the chip:

testing:

 

[superR]

What schematic have you used? I am interested in using the chip, but I can't seem to find a fool-proof schematic for TI's class D chips

 

[macky]

i did use the schematic from its datasheet, and compared it on EVM user guide...

 

[350650]

i also completed the ic based on application schematic diagram but its not working. i didnt wnt through the evm though

 

[macky]

^maybe you forgot the SHUTDOWN / MUTE pins configuration? check it out bro...

 

[johnyradio]

just wanna share my jungle-like proto of TI's Class D chip TPA3123 [25W+25W] bridged amp

hi Macky, was this outputting real 50 watts for you? This thread says maybe not:
https://answers.yahoo.com/question/index?qid=20131204142625AAXvN9X

also (anybody), looking at this kit, can you wager a guess whether it can be used in bridge mode without modification?
Digital Stereo Amplifier Class D Power Amp Kit Mini Audio Ampli Module 25WX2 Sz | eBay

thx!

 

[lutkeveld]

You can get 50Wpc BTL out of it in a 4 ohm load with the max supply voltage.

 

[johnyradio]

You can get 50Wpc BTL out of it in a 4 ohm load with the max supply voltage.

per channel?

thx

 

[lutkeveld]

Yeah (Wpc=watts per channel)

 

[johnyradio]

Yeah (Wpc=watts per channel)

i thought BTL (Bridge Tied Load) means both channels feed a single speaker, so it's a MONO system. -- so there's no "per channel", because there's only one channel.
https://en.wikipedia.org/wiki/Bridge-tied_load

Am i wrong?

Also, the TPA3123 is rated at 25WPC max, so there's no way to get 50WPC in a stereo config with two speakers.
http://www.ti.com/product/tpa3123d2

Am i wrong?

thx!

 

[lutkeveld]

No I am wrong, I thought this was the same chip as the TPA3116 but in another package. Output can be found in the datasheet.

 

[johnyradio]

ok. Think this chip can really output 50w in BTL mode with full supply V? This thread says maybe not:
https://answers.yahoo.com/question/index?qid=20131204142625AAXvN9X

thx!

 

[macky]

TPA3123 is 25W per channel, so if you will use the BTL config, then you will get 50W channel per chip