PAM8603A

Document number: DSxxxxx Rev. 1 - 2

11 of 16

www.diodes.com

November 2012

© Diodes Incorporated

PAM8603A

A Product Line of

Diodes Incorporated

Application Information

Test Setup for Performance Testing (Class D)

1. When the PAM8603A 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 PAM8603A 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 PAM8603A operation voltage is 6V. When the PAM8603A is powered with four battery cells, it should

be noted that the voltage of four new dry or alkaline batteries is over 6V, higher than its maximum operation voltage, which probably make

the device damaged. Therefore, it's recommended to use either four Ni-MH (Nickel Metal Hydride) rechargeable batteries or three dry or

alkaline batteries.

4. The input signal should not be too high, if too high, it will cause the clipping of output signal when increasing the volume. Because the DC

volume control of the PAM8603A has big gain, it will make the device damaged.

5. When testing the PAM8603A 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 using speaker as load.

Notes:

1. The Audio Precision (AP) AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer.

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

Anti-saturation Function

If the preset gain is haigher than 12dB, Anti-saturation is active by detecting the duty cycle of the PWM output when the mode been detected,

the gain is automatcally adjusted to the value that the output is not clip step by step. The maximum attenuation is -12dB (preset gain = 24dB).

The attach is immediately and the released time is 250ms per step.

Mute Operation

the outputs. This pin may be used as a quick disable or enable of the outputs without a volume fade. Quiescent current is listed in the electrical

Shutdown Operation

In order to reduce power consumption while not in use, the PAM8603A contains shutdown circuitry to turn off the amplifier's bias circuitry. The

For the best power on/off pop performance, the amplifier should be placed in the Mute mode prior to turning on/off the power supply.