Datasheet
TAS5624A
SLAS844 –MAY 2012
www.ti.com
Table 5. Fault Handling (continued)
Fault/Event Global or
Reporting Latched/Self
Fault/Event Action needed to Clear Output FETs
Method Clearing
Description Channel
Thermal
OTE (OTSD) Global FAULT Pin Latched Toggle RESET Hi-Z
Shutdown
OLP (CBC >2.6ms) OC shutdown Channel FAULT Pin Latched Toggle RESET Hi-Z
Latched OC (ROC >47k) OC shutdown Channel FAULT Pin Latched Toggle RESET Hi-Z
reduce signal level or Flip state, cycle by
CBC (24k<ROC<33k) OC Limiting Channel None Self Clearing
remove short cycle at fs/2
Stuck at Fault
(1)
(1 to 3
No PWM Channel None Self Clearing resume PWM Hi-Z
channels)
Stuck at Fault
(1)
(All
No PWM Global None Self Clearing resume PWM Hi-Z
channels)
(1) Stuck at Fault occurs when input PWM drops below minimum PWM frame rate given in Recommended Operating Conditions.
DEVICE RESET
When RESET is asserted low, all power-stage FETs in the four half-bridges are forced into a high-impedance
(Hi-Z) state.
In BTL modes, to accommodate bootstrap charging prior to switching start, asserting the reset input low enables
weak pulldown of the half-bridge outputs. In the SE mode, the output is forced into a high impedance state when
asserting the reset input low. Asserting reset input low removes any fault information to be signaled on the
FAULT output, i.e., FAULT is forced high. A rising-edge transition on reset input allows the device to resume
operation after an overload fault. To ensure thermal reliability, the rising edge of RESET must occur no sooner
than 4 ms after the falling edge of FAULT.
SYSTEM DESIGN CONSIDERATION
A rising-edge transition on RESET input allows the device to execute the startup sequence and starts switching.
Apply audio only according to the timing information for startup and shutdown sequence. That will start and stop
the amplifier without audible artifacts in the output transducers.
The CLIP signal indicates that the output is approaching clipping (when output PWM starts skipping pulses due
to loop filter saturation). The signal can be used to initiate an audio volume decrease or to adjust the power
supply rail.
The device inverts the audio signal from input to output.
The DVDD and AVDD pins are not recommended to be used as a voltage source for external circuitry.
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