SSM2301

Rev. A | Page 13 of 16

PROPER POWER SUPPLY DECOUPLING

To ensure high efficiency, low total harmonic distortion (THD),

and high PSRR, proper power supply decoupling is necessary.

Noise transients on the power supply lines are short-duration

voltage spikes. Although the actual switching frequency can

range from 10 kHz to 100 kHz, these spikes can contain frequency

components that extend into the hundreds of megahertz.

The power supply input needs to be decoupled with a good

quality low ESL and low ESR capacitor, usually around 4.7 μF.

This capacitor bypasses low frequency noises to the ground

plane. For high frequency transients noises, use a 0.1 μF

capacitor placed as close as possible to the VDD pin of the

device. Placing the decoupling capacitor as close as possible

to the SSM2301 helps maintain efficient performance.