LMR16010: LMR16010 ripple voltage

CharlieZhang

Part Number: LMR16010

The schematic is exact the same as the evaluation board LMR16010PEVM. The waveform is tested under 30V input and 5V1A output. Could you please advise how to solve it? Thanks in advance.

over 5 years ago

0 Timothy Hegarty over 5 years ago

TI__Guru 53152 points

Hi user5827751,

I forwarded your enquiry to the product expert.

Where are you measuring the output ripple on your board? Try measuring directly at the output cap.

Regards,
Tim

0 CharlieZhang over 5 years ago in reply to Timothy Hegarty

Prodigy 30 points

Hi Tim,
Thanks for your reply.
It's measured on output capcitor C22.

0 Timothy Hegarty over 5 years ago in reply to CharlieZhang

TI__Guru 53152 points

Looks like the output ripple as measured is in phase with the SW node voltage. I see the inductor is unshielded, so you may be picking up noise when measuring at the output cap located beside the inductor. Can you change to a shielded inductor?

Regards,
Tim

0 CharlieZhang over 5 years ago in reply to Timothy Hegarty

Prodigy 30 points

Hi Tim,

A shieled inductor resovle this issue. Thanks for your help.

Power management

Power management forum

LMR16010: LMR16010 ripple voltage