UCC12050: UCC12050 Radiated Emission Issue--Urgently

Mike Mike

Part Number: UCC12050

Tool/software:

Dear TI expert,

UCC12050 is used below to meet EN55011 Class B, but the there is big noise nearby 200M Hz

then we introudce two inductors to the input as below, the noise nearby 200M Hz is lower, but the noise nearby 30M Hz is much bigger than before, could you give me some suggestion?

Note: due to CF part, Y cap is not allowed to be used in this case.

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 74115 points

Hi,

An expert on this device will reply to you in the next week.

0 Mike Mike over 1 year ago in reply to Hong Huang

Prodigy 20 points

Hi Hong,

is it possible to reply me today? i know US expert is on Friday today. it's very urgent for me. thanks.

0 Hong Huang over 1 year ago in reply to Mike Mike

TI__Guru 74115 points

Hi,

If you know an expert, can you send an email to the expert you know today is on so you can get some advice today?

I do not know any expert today available. So need to wait until next week.

0 Mike Mike over 1 year ago in reply to Hong Huang

Prodigy 20 points

The probomen is that i don't know who is the expert on this chip

0 Hong Huang over 1 year ago in reply to Mike Mike

TI__Guru 74115 points

Hi,

What experts on this IC I know will be available next week.

0 Steven Mappus1 over 1 year ago in reply to Hong Huang

TI__Mastermind 33115 points

Mike,

On it's own, we know the UCC12050 with two ferrite beads can easily pass CISPR 32 class B. You show a schematic of UCC12050 with 2 ferrite beads but is the scan you show only the UCC12050 with ferrite beads or is the scan part of a system where the UCC12050 might be interacting with other EM emissions?

What is the noise floor measurement for the scan you are showing? What is the system being scanned (if not UCC12050 on it's own)? If system is scanned, what additional EMI mitigation/filter included in the system?

Steve

Power management

Power management forum

UCC12050: UCC12050 Radiated Emission Issue--Urgently