UCC28631: Very Slow Ripple

Hirotsugu Kobayashi

Mastermind 9530 points

Part Number: UCC28631

Hi, team.

Our customer designed 15W(12V/1.25A) adaptor using UCC28631.

But very slow output ripple is observed, time period is about 180~200Hz and peak-to-peak ripple voltage is about 200mV

Could you think any reason?

Where is the part where readjustment is needed?

Best Regards,

over 8 years ago

0 John Stevens over 8 years ago

TI__Expert 7395 points

Kobayashi-san,

Thank you for contacting us. I am sorry to hear you see some concerns here.

Can you share a schematic of the power supply and waveforms of this with conditions of input, output and how you are measuring the ripple?

These will greatly help to debug and support you.

Regards
John

0 Hirotsugu Kobayashi over 8 years ago in reply to John Stevens

Mastermind 9530 points

Hi, John.
Thnak you for your support.
Schematic is confidential, so I will mail it to you directly.
Please tell me your email.

Best Regads,

0 John Stevens over 8 years ago in reply to Hirotsugu Kobayashi

TI__Expert 7395 points

John.stevens@ti.com

Power management

Power management forum

UCC28631: Very Slow Ripple