PAM8003

Document number: DS36421 Rev. 2 - 2

9 of 12

www.diodes.com

May 2017

© Diodes Incorporated

PAM8003

supply coupling into the output drive signal. This noise is from the internal analog reference to the amplifier, which appears as degraded PSRR

and THD+N.

bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving shutdown.

Undervoltage Lock-Out (UVLO)

The PAM8003 incorporates circuitry designed to detect low supply voltage. When the supply voltage drops to 2.0V or below, the PAM8003

Short Circuit Protection (SCP)

The PAM8003 has short circuit 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 are disabled immediately. If the short was removed, the device activates

again.

Over-temperature Protection

Thermal protection on the PAM8003 prevents the device from damage when the internal die temperature exceeds +140°C. There is a 15°

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 30°C. This large hysteresis will prevent motor

boating sound well and the device begins normal operation at this point without external system intervention.

How to Reduce EMI (Electro Magnetic Interference)

A simple solution is to put an additional capacitor

1000μF 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.

Figure 2. Ferrite Bead Filter to Reduce EMI