PAM8302A

2.5W Filterless Class-D Mono Audio Amplifier

10

09/2011 Rev1.5

Power Analog Microelectronics, Inc

www.poweranalog.com

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 at Figure 1. The ferrite filter depresses EMI of

around 1MHz and higher. When selecting a ferrite bead, choose one with high impedance at high

frequencies and low impedance at low frequencies.

Figure 1: Ferrite Bead Filter to reduce EMI

220pF

220pF

OUT+

OUT-

Ferrite Bead

Ferrite Bead