A2432
AUDIO AMPLIFIER
AiT Semiconductor Inc.
www.ait-ic.com
2X3W CLASS-D WITH DC VOLUME CONTROL AND EARPHONE OUTPUT
DETAILED INFORMATION
Mute Operation
The MUTE pin is an input for controlling the output state of the A2432. A logic high on this pin enables the
outputs, a logic low on this pin disables the outputs. The terminal may be used as a quick disable/enable of
the outputs when changing channels between different audio sources. The MUTE pin can be left floating
due to the internal pull-up.
Shutdown operation
The A2432 employs a shutdown mode of operation designed to reduce supply current to the absolute
minimum level during periods of nonuse for power conservation. The SD input terminal should be held high
during normal operation when the amplifier is in use. The SD pin can be left floating due to the internal
pull-up.
Under Voltage Lock-out (UVLO)
The A2432 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to
1.8V or below, the A2432 outputs are disabled, and the device comes out of this state and starts to normal
function when VDD ≧ 2.0V.
Short -Circuit Protection
The A2432 has short circuit protection circuitry on the outputs to prevent damage to the device during
output-to-output shorts, output-to-GND and output-to-GND short occurs. When a short circuit is detected on
the outputs, the part immediately disables the drive. This is an unlatched fault. Normal operation is restored
when the fault is removed.
Thermal Protection
Thermal protection on the A2432 prevents damage to the device when the internal die temperature exceeds
160℃. There is a ±20℃ tolerance on this trip point from device to device. Once the die temperature exceeds
the thermal set point, the device enters into the shutdown state and the outputs are disabled. This is not a
latched fault. The thermal fault is cleared once the temperature of the die is reduced by 25℃. The device
begins normal operation at this point with no external system intervention.
Decoupling Capacitor (Cs)
The A2432 is a high-performance Class-D audio amplifier that requires adequate power supply decoupling to
ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients,
REV1.1
- MAY 2012 RELEASED, MAR 2017 UPDATED -
- 10 -
AITSEMI [ AiT Semiconductor ]
