PAM8301 Datasheet, PDF (9/11 Pages) Power Analog Micoelectronics – Filterless Class-D Mono Audio Amplifier

PAM8301
Filterless Class-D Mono Audio Amplifier
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.
OUT+
Ferrite Bead
OUT-
Ferrite Bead
220pF
220pF
Figure 1: Ferrite Bead Filter to Reduce EMI
Power Analog Microelectronics,Inc
www.poweranalog.com
9
09/2008 Rev 1.2