TAS5342L UVP

Rick Kernen

Other Parts Discussed in Thread: TAS5342L

I'm having problems with the TAS5342L shutting down during heavy music loads. At the point of "shut down" the VDD has dipped to 27.5v from its nominal of 29v. Can you tell me what the TAS5342L undervoltage protection (UVP) threshold is? Can this threshold be changed to allow a little more "ripple" in the power supply at times? I am able to eliminate the problem by adding a 6800uf cap on VDD at the amplifier. However I would rather not add this expense to the board and would like to find a little more elegant solution. And yes, before you ask, during the shut down times the amplifier is well into clipping.

over 13 years ago

0 Don Dapkus over 13 years ago

TI__Guru**** 189399 points

Hey, Rick,

This sounds like one of those Doctor, Doctor jokes...

Anyway, we don't actually have UVLO on the PVDD pins. I'm pretty sure GVDD_x does, and maybe the VDD pin, too, but those are good to at least 10.8V. I bet one of those (check GVDD_x first) is dropping below 10.8V. Since they are much lower current, you can probably use a much smaller decoupling cap to fix it on the offending terminal.

Let me know what you find.

-d2

0 Don Dapkus over 13 years ago in reply to Don Dapkus

TI__Guru**** 189399 points

Rick,

Any update?

-d2

0 Rick Kernen over 13 years ago in reply to Don Dapkus

Prodigy 50 points

D2,

I checked the GVdd and it was rock solid. However your information did help me to find the source of the problem. What was happening was our microprocessor was asserting a reset to the TAS5342L. Actually a pretty simple problem that took me way too long to discover.

Rick

Audio

Audio forum

TAS5342L UVP