PAM8403 datasheet(10/12 Pages) ARTSCHIP

10 / 12 page

Under Voltage Lock-out (UVLO)

Short Circuit Protection (SCP)

How t o R educe EMI (Electro Magnetic

Interference)

The PAM8403 incorporates circuitry designed to

detect low supply voltage. When the supply

voltage drops to 2.0V or below, the PAM8403

outputs are disabled, and the device comes out of

this state and starts to normal function when V

2.2V.

The PAM8403 has short c ircuit protection

circuitry on the outputs to prevent damage to the

device when output-to-output or output-to-GND

short occurs. When a short circuit is detected on

the

outputs,

the

outputs

a re

disabled

immediately. If the short was removed, the device

activates again.

A simple solution is to put an additional capacitor

1000 F at power supply terminal for power line

coupling if the traces from amplifier to speakers

are short (<20cm).

Most applications require a ferrite bead filter as

shown in Figure 2. The ferrite filter reduces EMI of

around 1 MHz and higher. When selecting a

ferrite bead, choose one with high impedance at

high frequencies, and low impedance at low

frequencies.

≥

Over Temperature Protection

Thermal protection on the PAM8403 prevents the

device from damage when the internal die

temperature exceeds 140°C. There is a 15 degree

tolerance on this trip point from device to device.

Once the die temperature exceeds the thermal

set point, the device outputs are disabled. This is

not a latched fault. The thermal fault is cleared

once the temperature of the die is reduced by

. This large hysteresis will prevent motor

boating sound well and the device begins normal

operation at this point without external system

intervention.

Figure 2: Ferrite Bead Filter to reduce EMI

°C

PAM8403

Filterless 3W Class-D Stereo Audio Amplifier

220pF

OUT+

OUT-

Ferrite Bead

PAM8403 Datasheet(PDF) 10 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

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