Data Sheet

Notes
1. The AP AUX-0025 low pass filter is necessary for every class-D amplifier measurement
done by AP analyzer.
2. Two 22uH inductors are used in series with load resistor to emulate the small speaker for
efficiency measurement.
7
Application Notice
1. When the PAM8403 works with LC filters, it
should be connected with the speaker before it's
powered on, otherwise it will be damaged easily.
2. When the PAM8403 works without LC filters,
it's better to add a ferrite chip bead at the
outgoing line of speaker for suppressing the
possible electromagnetic interference.
3. The absolute maximum rating of the
PAM8403 operation voltage is 5.5V. When the
PAM8403 is powered with 4 battery cells, it's
worth noting that the voltage of 4 new dry or
alkaline batteries is over 6V, higher than its
maximum operation voltage, which will probably
make the device damaged. Therefore, it's
recommended to use either 4 Ni-MH (Nickel
Metal Hydride) rechargeable batteries or 3 dry or
alkaline batteries.
4. It should not make the input signal too high,
which will cause the clipping of output signal
when increasing the volume. Because the digital
volume control of the PAM8403 has big gain, it
will make the device damaged.
5. When testing the PAM8403 without LC filters
by using resistor instead of speaker as the output
load, the test results, e.g. THD or efficiency, will
be worse than those of using speaker as load.
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Test Setup for Performance Testing
AP System One
Generator
PAM8403 Demo Board
+OUT
Input
Load
AP
Low Pass
Filter
AUX-0025
AP System One
Analyzer
GND
-OUT
VDD
Power Supply
PAM8403
Filterless 3W Class-D Stereo Audio Amplifier
03/2007
,Power Analog Microelectronics Inc