Texas Instruments TPA005D12 - Manual (Page 26)

Using The TPA005D12 Class-D EVM With the Plug-N-Play Platform
3-12 Details
3.4.2 Module 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.
3.4.2.1 S1 — 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
µ
A compared to approximately 2.5 mA in the mute mode. The
EVM shutdown current is based on V
DD,
R2, and capacitor leakage currents,
but will typically be 50
µ
A
±
5% for V
DD
= 5 V. The plug-n-play platform typically
draws 23 mA of current.
3.4.2.2 S2 — 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.