PAM8303C

Document number: DS36438 Rev.2 - 2

12 of 16

www.diodes.com

May 2018

© Diodes Incorporated

PAM8303C

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 must be returned to output noise ground and nowhere else. When these currents circulate elsewhere, the currents can

get into the power supply, the signal ground, and so on, or even worse, the currents can 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 must be returned to quiet ground. This

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

Power Supply Line

as short and thick as possible. For the power-line layout, a water stream, or any barricade, placed in the trace can result in the bad performance

of the amplifier (as shown in Figure 2).

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 must be placed very close to input pins.

Output filter

—the ferrite EMI filter must be placed as close to the output terminals as possible for the best EMI performance, and the capacitors

used in the filters must be grounded to system ground.