LM3463: Does VLedFB falling below 2.5V constitute a System Re-Powering?

Austin Allen

Part Number: LM3463

Hello,

The datasheet for the LM3463 specifies that there are two ways to clear faults, by applying a falling edge to the EN pin or performing a system re-powering.

My customer is wondering if the VLedFB pin falling below 2.5V constitutes this system re-powering and whether it would thereby clear a fault status.

Thank you,

Austin Allen

over 3 years ago

0 Sean Zhou over 3 years ago

TI__Mastermind 22745 points

Hi Allen,

No, please use the EN pin or re-powering to clear the fault.

Sean

0 Austin Allen over 3 years ago in reply to Sean Zhou

TI__Intellectual 2395 points

Thank you very much Sean!

0 Austin Allen over 3 years ago in reply to Sean Zhou

TI__Intellectual 2395 points

Quick follow-up question,

What does constitute a re-powering?

Best,

Austin

0 Sean Zhou over 3 years ago in reply to Austin Allen

TI__Mastermind 22745 points

Hi Austin,

Re-powering means power off first and then power on again.

Sean

0 Austin Allen over 3 years ago in reply to Sean Zhou

TI__Intellectual 2395 points

Sean,

That is to say that it is the Vcc pin losing power and then getting powered up again? The reason I ask is my customer saw the fault bit cleared when VLedFB fell, and while I passed on our official recommendation to use EN to clear fault bits, I was curious as to why this would have happened.

Best,

Austin

0 Sean Zhou over 3 years ago in reply to Austin Allen

TI__Mastermind 22745 points

Hi Austin,

Yes,as you have described.

Sean

Power management

Power management forum

LM3463: Does VLedFB falling below 2.5V constitute a System Re-Powering?