UCD3138: V33D AND V33A RIPPLE NOISE

jun yin

Part Number: UCD3138

Hi Sir:

We're using Step-Down Converters TPS6217X to power V33D and V33A, not by LDO; so our question is how the define Max noise/ripple for V33D and V33A here?

thanks a lot

Sean

over 7 years ago

0 Amiel Hussain over 7 years ago

TI__Expert 4070 points

Hello,
An engineer will look into this and get back to you.

0 Sean Xu over 7 years ago

TI__Genius 14580 points

Hi, Jun,

We haven't specified the noise ratio between DC and noise, but by Thumb of Rules, the power supply should be stable, and uses 10uF near the converter, then uses 4.7uF + 10nF near the UCD3138's V33D and V33A.
Regards,
Sean

Power management

Power management forum

UCD3138: V33D AND V33A RIPPLE NOISE