8

Application Notice

1

When PAM8803 works without filter, we must

connect the speaker before turn on. Else, it will

be easy to damage the chip.

2

When PAM8803 works without filter, it

will

be best that adding a ferrite chip bead at the

outgoing line of speaker in order to suppress

possible electromagnetic interference .

3

The absolute maximum rating of operation

voltage is 6.0V. While using 6V power regulator,

even the chip can deliver 4W sine wave with a 4

Ohm speaker, it is not recommended for long

term using due to the heat dissipation. But if the

input signal is a music signal, then it can work in

long term since the average power output is

much less than 4W. When using dry battery cell,

we should notice that if the battery cell is 4 new

dry batteries or alkaline batteries, even the

voltage will be over 6V, it still can work safety.

Since the output voltage of the 4 pack of new dry

batteries will be reduced very quickly after turn

on due to the internal resistance of the battery.

There is no dangerous of damaging the chip

when playing music or speech, even use 4 new

dry batteries.

To reduce the effect of the

increasing of internal resistance of battery after

long term discharging, it is recommended to

connect a 1000uF electrolytic capacitor between

the power supply and the ground.

4

Because digital volume control has big gain,

we can not make input signal too high to cause

the clipping of the output signal when increase

volume, also it may damage the chip.

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Test Setup for Performance Testing

Notes

1. The AP AUX-0025 low pass filter is necessary for every class-D amplifier measurement

done by AP analyzer.

2. Two 22 H inductors are used in series with load resistor to emulate the small speaker for

efficiency and quiescent current measurement.

μ

AP System One

Generator

PAM8803 Demo Board

+OUT

Input

Load

AP

Low Pass

Filter

AUX-0025

AP System One

Analyzer

GND

-OUT

VDD

Power Supply

,

Power Analog Microelectronics Inc

www.poweranalog.com

PAM8803

3W Filterless Stereo Class-D Audio Amplifier

with Digital Volume Control

12/2009 Rev 1.4