Diodes PAM8803 - Manual (Page 11)

PAM8803
Document number: DSxxxxx Rev. 1 - 4
11 of 14
www.diodes.com
November 2012
© Diodes Incorporated
PAM8803
A Product Line of
Diodes Incorporated
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 4Ω
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 1000µF 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.
Test Setup for Application Testing
Notes: 2. The AP AUX-0025 low pass filter is necessary for every class-D amplifier measurement done by AP analyzer.
3. Two 22 H inductors are used in series with load resistor to emulate the small speaker for efficiency and quiescent current measurement.