TPS758: TPS758

Noam Weidenfeld1

Part Number: TPS758

Hello,

When a load is applied to the voltage output (3.8V, ~50-200 m"a) there is a sizzling noise probably from the capacitors. The load is Gemalto's modem PLS62. The power coupling is 2 x 100uF.

What can be the reason for that?

Thanks

Noam

over 5 years ago

0 JCHK over 5 years ago

TI__Guru 50030 points

Hi Noam,

It would be good to verify the actual source of the noise. Are you using 2x100uF ceramic capacitors?. Large surface area ceramics have a no piezo-electric effect which means you may be right in that they are the source of the audible noise. Here is an article from Murata discussing the same https://www.murata.com/en-us/support/faqs/products/capacitor/mlcc/char/0020

There is also a link to mitigating the noise by using film capacitors.

I hope this helps.

Power management

Power management forum

TPS758: TPS758