LMG3410EVM-018: Fault pin question

Bryan Huang

Intellectual 445 points

Part Number: LMG3410EVM-018

My customer uses LMG3410EVM-018 jump to 225W PFC replace Mosfet,

the actual power can only reach 120W and Ids will stop for a short time,

The Fault also has drop, Is this a problem with EVM?

CH1:IN CH2:Fault CH3:VBUS CH4:IDS

over 4 years ago

0 Lixing Fu over 4 years ago

TI__Expert 3225 points

Hi Bryan,

The EVM has been fully tested with no issues. What is the VDD voltage supply you are using? It looks to me it could be some UVLO fault. Could you please check on the VDD voltage to make sure it does not drop below the threshold?

Thanks,

Lixing

0 Bryan Huang over 4 years ago in reply to Lixing Fu

Intellectual 445 points

Hi Lixing:

The issue has been found,

as customer uses PFC PWM OUTPUT is 12V, need buck to 5V,

we use resistor divider, but the resistance value too large, lead to rise time too long,

change to ziner, the work is normal.

0 Lixing Fu over 4 years ago in reply to Bryan Huang

TI__Expert 3225 points

Hi Bryan,

This is great news. Glad you have found the issue and thanks for letting us know. Please let me know in the future if you need any help.

Thanks,

Lixing

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LMG3410EVM-018: Fault pin question