Data Sheet

SSM2305

Rev. B | 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, low ESR capacitor, usually of around 4.7 µF. This

capacitor bypasses low frequency noises to the ground plane.

For high frequency transient noise, use a 0.1 µF capacitor as

close as possible to the VDD pin of the device. Placing the

decoupling capacitor as close as possible to the SSM2305 helps

maintain efficient performance.