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TAS5414

TAS5424

SLOS514 – FEBRUARY 2007

DESCRIPTION OF OPERATION (continued)

amplifier. If the dc offset reaches the level defined in the I2C registers for the specified time period, the

circuit triggers. By default a dc detection event does not shut the output down. The shutdown function can

be enabled or disabled via I2C. If enabled, the triggered channel shuts down, but the others remain

playing and the FAULT pin is asserted. The positive dc level and negative dc level are defined in I2C

registers and can have separate thresholds.

4. Clip Detect—The clip detect circuit alerts the user to the presence of a 100% duty-cycle PWM due to a

clipped waveform. When this occurs, a signal is passed to the CLIP_OTW pin and it is asserted until the

100% duty-cycle PWM signal is no longer present. All four channels are connected to the same

CLIP_OTW pin. Through I2C, the CLIP_OTW signal can be changed to clip-only, OTW-only, or both. A

fourth mode, used only during diagnostics, is the option to report tweeter detection events on this pin (see

the Tweeter Detection section). The microcontroller in the system can monitor the signal at the

CLIP_OTW pin and may be configured to reduce the volume to all four channels in an active

clipping-prevention circuit.

5. Overtemperature Warning (OTW) and Overtemperature Shutdown (OTSD)—By default, the

CLIP_OTW pin is set to indicate an OTW. This can be changed via I2C commands. If selected to indicate

a temperature warning, the CLIP_OTW pin is asserted when the die temperature reaches 125

°C. The

OTW has three temperature thresholds with a 10

°C hysteresis. Each threshold is indicated in I2C register

0x04 bits 5, 6, and 7. The TAS5414 and TAS5424 still function until the temperature reaches the OTSD

threshold. 155

°C, at which time the outputs are placed into Hi-Z mode and the FAULT pin is asserted. I2C

is still active in the event of an OTSD and the registers can be read for faults, but all audio ceases

abruptly. The OTSD resets at 145

°C, to allow the TAS5414/5424 to be turned back on through I2C. The

OTW is still indicated until the temperature drops below 115

°C. All temperatures are nominal values.

6. Undervoltage (UV) and Power-on-Reset (POR)—The undervoltage (UV) protection detects low voltages

on PVDD, AVDD, and CP. In the event of an undervoltage, the FAULT pin is asserted and the I2C

PVDD drops low enough. A POR event causes the I2C to go into a high-impedance state. After the device

recovers from the POR event, the device must be re-initialized via I2C.

7. Overvoltage (OV) and Load Dump—The OV protection detects high voltages on PVDD. If PVDD

reaches the overvoltage threshold, the FAULT pin is asserted and the I2C register is updated. If the

voltage increases beyond the load dump threshold of 29 Vdc, the device shuts down and must be

restarted once the voltage returns to a safe value. After the device recovers from the

≈ load dump event,

the device must be re-initialized via I2C. The TAS5414 and TAS5424 can withstand 50-V load-dump

voltage spikes (see Figure 15). Also depicted in this graph are the voltage thresholds for normal operation

region, overvoltage operation region, and load-dump protection region. Figure 13 shows the regions of

operating voltage and the profile of the load dump event. Battery charger voltages from 25 V to 35 V can

be withstood for up to 1 hour.

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