TPA4411: Short-Circuit and Thermal Protection

Hideki Hayashi1

Expert 6000 points

Part Number: TPA4411

Hi team

Could you explain in more detail about Short-Circuit and Thermal Protection?

1. When does the protection activate? Which current for SCP? Where temp?

2. How much is the threshold?

Regards,

Hayashi

over 1 year ago

0 Ivan Salazar over 1 year ago

TI__Guru* 95335 points

Hi Hideki-san,

Regarding the short circuit protection, you can refer to this older e2e thread: (+) Short-circuit protection feature of TPA6136A2 and TPA4411 - Audio - INTERNAL forum - Audio - INTERNAL - TI E2E support forums

As for the thermal protection, this is included in the operating characteristics table:

Best regards,
-Ivan Salazar
Applications Engineer

0 Hideki Hayashi1 over 1 year ago in reply to Ivan Salazar

TI__Expert 6000 points

Hi Ivan,

Thank you.

What behavior in the SCP? Shutdown?

After the protection, how and what condition does customer recover TPA4411 from fault?

SCP: Auto retry but what does trigger TPA4411 recover?

TSD: Recovering threshold is TSDthreshold - 15C. Is it auto-retry?

Regards,

Hayashi

0 Ivan Salazar over 1 year ago in reply to Hideki Hayashi1

TI__Guru* 95335 points

Hi Hideki-san,

Yes, the protection state is similar to shutdown, with the difference that it will be periodically trying to enable back again.

In most Class-AB type of amplifiers, the protection is based on current measurement, so if the current trips over the limit when it tries to recover it will go back to protection state, otherwise it will resume normal operation.

Yes, the temperature protection is also auto-retry, once the temp goes 15C below the threshold it will resume normal operation.

Best regards,
-Ivan Salazar
Applications Engineer

Audio

Audio forum

TPA4411: Short-Circuit and Thermal Protection