TPS62160: Questions about the noise in the TPS62160 spectrum？

Bob Lee62837

Part Number: TPS62160

Dear support member,

My customer used TPS62160.

When measuring the spectrum with TPS62160, noise appeared from 10 kHz to 150 kHz.
The switching frequency is 2.25 MHz, but is this coming out of the IC?
What is the cause?

Best regard.
Bob Lee.

over 8 years ago

0 Chris Glaser over 8 years ago

TI__Guru**** 151520 points

Can you provide a plot that shows the noise spectrum and give the conditions (Vin, Vout, Iout) under which it was measured?

Was it measured on the EVM or their own PCB?

0 Bob Lee62837 over 8 years ago in reply to Chris Glaser

Mastermind 7230 points

Dear Chris Glaser,
Thank you very much for reply.

Specification condition is following.
Vin:10V
Vout:5.6V
Iout:0.4A

Customer made PCB.

I want to send a waveform.
Could you tell me your e-mail address?

Or
Could you send it to by a E2E private message?

Best regard.
Bob Lee.

0 Chris Glaser over 8 years ago in reply to Bob Lee62837

TI__Guru**** 151520 points

Yes, you can send the schematic and waveform to me by a conversation in the top right of the screen.

0 Chris Glaser over 8 years ago in reply to Chris Glaser

TI__Guru**** 151520 points

Thanks for sending. It seems that you have side bands when powering your load circuit?

At these highest frequencies, ferrite beads are frequently used at the output of the DC/DC to block the high frequency noise.

If this doesn't help, can you increase the load and see if this affects the noise?

0 Bob Lee62837 over 8 years ago in reply to Chris Glaser

Mastermind 7230 points

Dear Chris Glaser,

Thank you very much for reply.

I will tell customers to try ferrite beads.

I will feedback result.

Best regard.

Bob Lee.

0 Chris Glaser over 8 years ago in reply to Bob Lee62837

TI__Guru**** 151520 points

Hi Lee-san,

Was the customer able to try the ferrite beads?

0 Bob Lee62837 over 8 years ago in reply to Chris Glaser

Mastermind 7230 points

Dear Chris Glaser,

Thank you very much for reply.

I told my customer ferrite beads.

I don't recieve feedback from My customer.

I will confirm.

Best regard.

Bob Lee.

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TPS62160: Questions about the noise in the TPS62160 spectrum？