Texas Instruments SLOU082 manual Module Switches, 1 S1 Ð Shutdown Switch, 2 S2 Ð Mute Switch

Plug-N-Play Platform Inputs and Outputs

3.6 Module Switches

The TPA032D03 mono class-D audio amplifier evaluation module is equipped with two pushbutton switches that allow the module shutdown and mute functions to be manually activated.

3.6.1S1 Ð Shutdown Switch

To have the module amplifier IC enter the shutdown mode, press the Shutdown switch (S2) on the module. S2 connects the amplifier IC SHUTDOWN pin to ground, forcing it into a low-power state. This function can be controlled by an external control input to the SD module pin.

The shutdown mode reduces the amplifier IC current consumption to less than 1 ∝A compared to approximately 2.5 mA in the mute mode. The EVM

shutdown current is based on VCC, VDD, R2, R5, and R6, and capacitor leakage currents, but will typically be 97 ∝A ±5% for VCC = 12 V and VDD = 5

V. The plug-n-play platform typically draws 60 mA of current.

3.6.2S2 Ð Mute Switch

Pushbutton switch S1 on the TPA032D03 class-D EVM allows manual muting of the amplifier IC. S1 connects the amplifier IC MUTE pin to ground, muting the output. The EVM Mute control input pin also allows external control of this function.

In the mute mode, the amplifier IC lowside output transistors are turned on, shorting the load to ground. This reduces the EVM current to 2.5 mA.

3.6.3J1 Ð Headphone Jack Mode Switch

EVM headphone jack J1 is equipped with an internal switch that grounds the amplifier MODE pin until a plug is inserted into the jack. When a plug is inserted into the headphone jack, the IC MODE pin goes high and the IC headphone amplifier goes active and the class-D amplifier shuts off.

3-6 Details