PAM8303C

Document number: DSxxxxx Rev. 1 - 2

12 of 17

www.diodes.com

June 2013

© Diodes Incorporated

PAM8303C

A Product Line of

Diodes Incorporated

PCB Layout Guidelines

Grounding

It is recommended to use plain grounding or separate grounds. Do not use one line connecting power GND and analog GND. Noise currents in

the output power stage need to be returned to output noise ground and nowhere else. When these currents circulate elsewhere, they may get

into the power supply, or the signal ground, etc, even worse, they may form a loop and radiate noise. Any of these instances results in degraded

amplifier performance. The output noise ground that the logical returns for the output noise currents associated with Class-D switching must tie

to system ground at the power exclusively. Signal currents for the inputs, reference need to be returned to quite ground. This ground only ties to

the signal components and the GND pin. GND then ties to system ground.

Power Supply Line

be routed as short and thick as possible. For the power line layout, just imagine water stream, any barricade placed in the trace (shown in Figure

2) could result in the bad performance of the amplifier.

Figure 2. Power Line

Components Placement

Decoupling capacitors-As previously described, the high-frequency 1µF decoupling capacitors should be placed as close to the power supply

Input resistors and capacitors need to be placed very close to input pins.

Output filter - The ferrite EMI filter should be placed as close to the output terminals as possible for the best EMI performance, and the capacitors

used in the filters should be grounded to system ground.