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Old 9th April 2009, 04:32 PM   #1
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Join Date: Feb 2004
Location: bangalore
Default 8 Channel Class D Based on TAS5706A

Hi All, I've just started a 8 channel Class D amp based on TI TAS5706A, I've finished the first stage of schematics. I'm designing 4 TAS5706A modules which will then be plugged on to a Base board with an ARM7 microcontroller for all the i2c and control stuff. Does the TAS5706 require any additional heatsink apart from the PCB copper layer? I've attached a block diagram. i can also attach the schematics if anyone is interested.
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Old 9th April 2009, 04:56 PM   #2
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Join Date: Nov 2007
Location: Dallas
The TAS5706 EVM2 PCB is roughly 2 inches by 3 inches...
Has a serious groundplane. Presumably for heatsinking?
I've tested hundreds, never even felt one get warm.

But my procedure is fairly brief, I can't say for sure
what happens in extended use? And I'm just a test
monkey, not a real engineer who knows anything.

I'd have to point you to TI's spec sheet.
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Old 10th April 2009, 04:37 PM   #3
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Join Date: Nov 2007
Location: Dallas
I noticed one other detail that might prove helpful.

The ground pad on top, the one the TAS5706 gets
soldered to. Its got a small array 6x6 (36 in total)
vias through to the ground plane on the backside...

Not sure if thats for thermal or other reasons?
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Old 12th April 2009, 07:37 AM   #4
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Join Date: Feb 2004
Location: bangalore
Well it'd be impossible for me to solder the thermal pad on the TAS5706A without some kind of hot air or BGA rework tool. So i'm planning to have 4 - 5 0.1" PTH holes so i can solder the pad and fill up PTH. I guess this will give better thermal conductivity than the tiny vias used in the EVM.
Another question is that, can i use standard 0.1" berg strip headers to provide power supply to the TAS5706A. Will this be able to handle the current? Of course i'm using 6 pins for PVCC and 12 for Gnd on the main connector, instead of a single pin.
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