Texas Instruments TPA005D12 3.4.2Module Switches, 3.4.2.1S1 Ð Shutdown, 3.4.2.2S2 Ð Mute Switch

Using The TPA005D12 Class-D EVM With the Plug-N-Play Platform

3.4.2Module Switches

The TPA005D12 class-D stereo audio amplifier evaluation module is equipped with two pushbutton switches that allow the module shutdown and mute functions to be manually activated.

3.4.2.1S1 Ð Shutdown

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 approximately 1 ∝A compared to approximately 2.5 mA in the mute mode. The EVM shutdown current is based on VDD, R2, and capacitor leakage currents, but will typically be 50 ∝A ±5% for VDD = 5 V. The plug-n-play platform typically draws 23 mA of current.

3.4.2.2S2 Ð Mute Switch

Pushbutton switch S1 on the TPA005D12 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.

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