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LM5118: FB function inquiry.

David Kim2

Genius 3305 points

Part Number: LM5118

Hi

My customer is conducting a test to control the FB pin with an external signal.
The connection was as follows.
DC Supply (#1) : Input 53V
DC Supply(#2) : FB 2V

However, if DC 2V is applied to the FB pin, the LM5118 dies.
Is there a problem with the test method?
The SCH is as follows.

Thanks

over 3 years ago

0 Richard Fu22 over 3 years ago

TI__Mastermind 31315 points

Hi David,

The engineer responsible for this part is currently out of office and will return back to office next week.

Regards,

Richard

0 Stefan Schauer over 3 years ago in reply to Richard Fu22

TI__Guru 58661 points

Hi David,

thank you for using the E2E forum.

can you explain in more detail what "the LM5118 dies" means?

I assume that if you say that 2V are applied at FB that you mean you apply this at ADJ.

-> please conform.

-> applying 2V at FB will disable the regulation and shut down the output

Can also add the power stage part, esp. the high side FB resistor connection?

What voltage do you measure on ADJ when no voltage is applied here?

What happens to the output voltage if you apply the exact same voltage you have measured above and then slowly change this to the 2V?

Best regards,

Stefan

0 Stefan Schauer over 3 years ago in reply to Stefan Schauer

TI__Guru 58661 points

Hi David,

I have not seen an update on this thread for the last 14 days.

Have all questions now been clarified and answered.

If yes, please click on the resolved button, otherwise let me know with the required details.

Best regards,

Stefan