PAM8803
3W Filterless Stereo Class-D Audio Amplifier
with Digital Volume Control
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
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 .
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.
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,
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.
Test Setup for Performance Testing
PAM8803 Demo Board
Load
AP
+OUT
Low Pass
Input
AP System One
Analyzer
AP System One
Filter
Generator
AUX-0025
-OUT
GND
VDD
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for every class-D amplifier measurement
done by AP analyzer.
2. Two 22ꢀH inductors are used in series with load resistor to emulate the small speaker for
efficiency and quiescent current measurement.
Power Analog Microelectronics,Inc
www.poweranalog.com
12/2009 Rev 1.4
8
PAM [ POWER ANALOG MICOELECTRONICS ]
