TPS40055 conducted EMI fail

Prescott Siao

Intellectual 2220 points

Other Parts Discussed in Thread: TPS40055

Hi Team,

YIAPFJ1137T---- sch 20160918.pdf

J社_conduction test results.pdf

Attached file is the TPS40055 schematic.

And the picture is the conducted EMI test result.

Can you please give suggestion to improve the conducted EMI?

Thanks.

Prescott

over 8 years ago

0 Aaron Jones over 8 years ago

TI__Intellectual 760 points

Hi Prescott,

An input EMI filter should help--details are on the application note linked below:

0 JULIA TRUCHSESS over 8 years ago

Intellectual 310 points

You have what looks like a good two-stage input filter, but you need to look closely at the impedance curves of the common-mode chokes at the frequencies at which you're failing. Layout of the switcher is also critical - trace routing, trace lengths, ground planes, etc.

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TPS40055 conducted EMI fail