TAS5614LA: Randomly fault pin goes low .

Hi Sangcheol

  The schematic seems using the PBTL, not the BTL?

  We could check OTW pin together with Fault pin to further identify the problem. Usually it could be the overcurrent, or over temperature. We could specially check this two.

1.I am using BTL, the schematic for the OUT_A/B part is connected but the parts are not used.

2. I will check OTW.

3. If Ioc is 15 A at 24kΩ, how many A is it at 30kΩ,

4. Is it 15A when driving BTL 2ch? Is it 1ch(OUT_C/D)7.5A+1ch(OUT_A/B)7.5A=15A?

4. If Roc is greater than 47kΩ, will the fault be low if it is more than 15A?

Hi Sangcheol.

sangcheol Park said:

1.I am using BTL, the schematic for the OUT_A/B part is connected but the parts are not used.

You do not use OUT_A/B, so did you remove the A/B components? Please indicate which components are retained in the schematic.

sangcheol Park said:

3. If Ioc is 15 A at 24kΩ, how many A is it at 30kΩ,

4. Is it 15A when driving BTL 2ch? Is it 1ch(OUT_C/D)7.5A+1ch(OUT_A/B)7.5A=15A?

4. If Roc is greater than 47kΩ, will the fault be low if it is more than 15A?

We will take a check.

BR.

Wei Qiu.

If a strange PWM signal is input to INPUT_C/D, does it cause a fault state?

Could you share the waveforms of the PWM signal?

Shadow He said:

  We could check OTW pin together with Fault pin to further identify the problem. Usually it could be the overcurrent, or over temperature. We could specially check this two.

Meanwhile check what fault the device report.

VOLUME 99 50Hz 0dB signal in 

No siganl in.

Please check.

It will fault on once every 20-30 days or so.
(The fault on occurs even though the input signal is normal music and the volume is set to 1 (minimum)).
The PWM waveform seems to be normal in the normal state. There is no PWM data in the fault on state.
In a typical test, it does not fault on, but faults on at about volume 34 with a 2 ohm load.
What I want to know is, are there any other situations that can cause fault on, such as I2S or I2C, PWM input, etc.
The thermal protection works fine.

Translated with DeepL.com (free version)

When using INPUT_C/D only, can INPUT_A/B be left open or should it be connected to GND?

Hi 

sangcheol Park said:

When using INPUT_C/D only, can INPUT_A/B be left open or should it be connected to GND?

Left them open should be fine.

sangcheol Park said:

What I want to know is, are there any other situations that can cause fault on, such as I2S or I2C, PWM input, etc.

There's shouldn't be. All the fault condition have listed in the datasheet 7.3.5 to 7.3.11. 

sangcheol Park said:

In a typical test, it does not fault on, but faults on at about volume 34 with a 2 ohm load.

What is the output power under this condition? And how about the temperature when long time working?

What is the output power under this condition? And how about the temperature when long time working?

Output power is138W 2 ohms(DC 23V), and when long time working it is on OTW.

What does none mean? (7.3.11.) Is it high(Fault pin)?

Hi

Yes, the last 3 condition won't report on FALUT pin. The pin stays high.

Thank you very much.

Please check these.

3. If Ioc is 15 A at 24kΩ, how many A is it at 30kΩ,

4. Is it 15A when driving BTL 2ch? Is it 1ch(OUT_C/D)7.5A+1ch(OUT_A/B)7.5A=15A?

4. If Roc is greater than 47kΩ, will the fault be low if it is more than 15A?

Hi

  The 15A is for BTL 1ch.

  The other two questions are a little hard to answer, let me check today if able to find out some material about this device.

Thank you very much.