LM5175: Webench based designed fails RE & CE EMC test

Robert Maston

Part Number: LM5175

We have a circuit based on the webench designer. It fails RE & CE EMC and is dependent on H-bridge MOSFET choice with TI spec'ed ones being the worse. Would like to submit my schematic and have an experienced FEA call me back. Gate ferrites reduce noise. Operation is primarily buck mode.

over 7 years ago

0 Youhao Xi over 7 years ago

TI__Guru* 78080 points

What is your phone number? Could you show SW1 and SW2 waveforms under the operating condition of your EMC test? Could you tell at what frequency range or ranges the emission does not pass, and by how much? And, can we see your schematic and layout? You may send these info to youhao.xi@ti.com

Thanks,

0 Garrett Roecker over 7 years ago

TI__Mastermind 21720 points

Hi Robert,

EMC is heavily linked to layout of the circuit. Here are some articles (Part 1, Part 2, Part 3) covering the topic of layout when using the LM5175.

You can send me the schematic and layout directly at g-roecker@ti.com

Thanks,

Garrett Roecker

Power management

Power management forum

LM5175: Webench based designed fails RE & CE EMC test