PAM8304
Document number: DS36589 Rev. 1 - 2
7 of 11
www.diodes.com
October 2013
© Diodes Incorporated
PAM8304
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Application Information (cont.)
Shutdown Operation
In order to reduce power consumption while not in use the PAM8304 contains amplifier shutdown circuitry. When a logic low or ground is applied
to the /SD pin the PAM8304 will enter a standby mode and supply current drawn will be minimized.
Under Voltage Lock-out (UVLO)
The PAM8304 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8304 goes
into a state of shutdown. The device returns to normal operation only when VDD is higher than 2.5V.
Short Circuit Protection (SCP)
The PAM8304 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorts or output-to-
GND shorts occur. When a short circuit occurs, the device immediately goes into shutdown state. Once the short is removed the device will be
reactivated.
Over Temperature Protection (OTP)
Thermal protection prevents the device from damage. When the internal die temperature exceeds a typical of 150°C the device will enter a
shutdown state and the outputs are disabled. This is not a latched fault, once the thermal fault is cleared and the temperature of the die decreased
by 40°C the device will restart with no external system interaction.
Anti-POP and Anti-Click Circuitry
The PAM8304 contains circuitry to minimize turn-on and turn-off transients or “click and pops”, where turn-on refers to either power supply turn-on
or device recover from shutdown mode. When the device is turned on, the amplifiers are internally muted. An internal current source ramps up the
internal reference voltage. The device will remain in mute mode until the reference voltage reach half supply voltage. As soon as the reference
voltage is stable, the device will begin full operation. For the best power-off pop performance, the amplifier should be set in shutdown mode prior
to removing the power supply voltage.
