TPS54560B-Q1: Why does the capacitor make a sound?

user6175695

Part Number: TPS54560B-Q1

Hai:

The capacitor will make a sound when current is High. The current has a resonant waveform of 7.4KHz. I want to know why the wave of 7.4KHz form，and how to solve the sound of current.

Hope you can help me. Thank you.

Leon

over 5 years ago

0 Andy Chen over 5 years ago

TI__Mastermind 34255 points

Pls upload PCB layout with component silk layer, and full GND polygen.

0 user6175695 over 5 years ago in reply to Andy Chen

Prodigy 100 points

Hai:

I just upload the files,Please Check.Thank you

20190930.rar

0 Andy Chen over 5 years ago in reply to user6175695

TI__Mastermind 34255 points

Hi,

Sorry that I can't open the file with Altium, wha't the PCB software you use? you can upload image as below:

1. Component silk overlay+top layer

2. Component silk overlay+bottom layer

3. Component silk overlay+other mid layer with important traces of converter

0 user6175695 over 5 years ago in reply to Andy Chen

Prodigy 100 points

Hi:

After two days verification. I have solved the problem.When you look at the first picture I had upload，you will find Inductance of 100UH and Capacitance of 4.7UF are not matched. When I change Larger capacity of capacitance . Capacitabce has no noise，and the wave of Capacitance is very good. Thank you.

0 Andy Chen over 5 years ago in reply to user6175695

TI__Mastermind 34255 points

Good Practice!

Pls double check if the SW node waveform is stable at full load and at low ambient temp.

0 user6175695 over 5 years ago in reply to Andy Chen

Prodigy 100 points

Hi:

I have measure the Wave of SW. The wave is relatively stable when the current is between 0 and 2.5A. Thank you.

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TPS54560B-Q1: Why does the capacitor make a sound?