TPS4H160-Q1: EMC test problem

Dongbao Zhou

Part Number: TPS4H160-Q1

Hi team,

My customer use TPS4H160-Q1, however, they faced with some EMC problem.

Here are the CE test results, you can see the internal oscillator and charge pump switching frequency causes the fail of CISPR25. RE test is also failed, 1uF+0.1uF+0.01uF capacitors are added in the input pin, however, that doesn't improve the test results.

Could you help give some advice on this? Thanks.

Dongbao

over 7 years ago

0 Mahmoud Harmouch over 7 years ago

TI__Mastermind 28340 points

Hello,

Would you please send schematics and layout for review?

Regards

0 Mahmoud Harmouch over 7 years ago in reply to Mahmoud Harmouch

TI__Mastermind 28340 points

Hello,

Please answer the question above. The thread will be closed if we do not receive an answer by 8/2/18.

Regards

0 Dongbao Zhou over 7 years ago in reply to Mahmoud Harmouch

TI__Expert 4170 points

Hi Harmouch，

Thanks for your feedback, customer hesitates to share the schematic and PCB.

I checked the layout on-site, found that the small capacitor is far away from the input, i ask them to add 0.1uf+0.01uf capacitors as close as possible to the input pin.

Do you think we need to add filters in the output or anywhere else?

Thanks.

Dongbao

0 Mahmoud Harmouch over 7 years ago in reply to Dongbao Zhou

TI__Mastermind 28340 points

Hello,

In addition to input capacitors, 22nF capacitor on the output may help. If a ground network is used, a 22nF in parallel may also help.

Regards

Power management

Power management forum

TPS4H160-Q1: EMC test problem