SLASEC2B November 2016 – February 2019 TAS2557
The TAS2557 has an integrated over-temperature protection that is enabled once the Class-D is powered up. If the device internal junction temperature exceeds the safe operating region it will trigger the over-temperature fault. Once the fault is detected the TAS2557 disables the audio channel and powers down the Class-D amplifier. The device waits until the user reads the over-temperature flag INT_OT to re-enable the Class-D amplifier if the junction temperature returns into a safe operating region. When an over-temperature event occurs, a status flag INT_OT is set. This register is sticky and the bit will remain high for as long as it is not read, or the device is not reset. The over-temperature event can also be used to generate an interrupt if required. Refer to IRQs and Flags section for more details. The over-temperature automatic re-enable can be disabled by setting OT_RT signal. If the automatic re-enable is disabled, the Class-D must be re-enabled by setting PWR_SPK high after the over-temperature fault. All other configurations are preserved and the audio channel will power up with the last configured settings.