TAS5634: TAS5634 Fault goes low when PVDD switch from 58V to 40V

Hi Mototw

   How about set the device into Hi-Z first, then change the PVDD voltage, will fault still occur? If so, we may need to check if there's any power supply unstable when you doing this change.

During the idle (no output) condition the PVDD switching will not trigger the fault to LOW, it happens when playing a music source.

Hi Mototw.

Could you check what fault occurs under this condition, Error reporting as below.

Meanwhile, please help to observe the waveforms of Output, PVDD and Fault when fault occurs.

BR.

Wei Qiu.

HI,

Below is the signal that captured during fault goes low. when the PVDD drops, it trigger the fault goes low. the speaker output signal seems normal at that time. 

green:PVDD

yellow:speaker output BTL config(1KHZ playback).

light blue: OTW

pink: fault

Hi Mototw.

I will reproduce your problem on our EVM board and will give you feedback tomorrow.

BR.

Wei Qiu.

Hi Wei Qiu,

Both GVDD and VDD were stable.

Could you try to load at higher power output? 

eg. BTL 6 ohm 70W ~80W

Hi Mototw.

I'm sorry that the EVM of TAS5634 my side is broken the first two days, I'm applying for a new EVM board.

It may take a week to reach my side.

I'll update the test result around May 4th.

MOTOTW said:

Could you try to load at higher power output? 

eg. BTL 6 ohm 70W ~80W

BR.

Wei Qiu.