LM5050-1: LM5050-1 start up issue

Red Yen

Part Number: LM5050-1

Hi Support team

pls refer following for the schematic and Waveform, the part marked in the red circle is affected by the ORing FET. How can I improve this problem? Thank you,

over 5 years ago

0 Karikalan Selvaraj over 5 years ago

TI__Genius 16305 points

Hi,

I will look into this and get back to you soon.

Regards,
Kari.

0 Red Yen over 5 years ago in reply to Karikalan Selvaraj

TI__Expert 4330 points

Hi Kari

Any comments on this case

0 Karikalan Selvaraj over 5 years ago in reply to Red Yen

TI__Genius 16305 points

Hi

At 2V, MOSFET is getting turned ON due to LM5050-1 turning ON.
Can we capture the gate waveform to confirm this?

As the MOSFETs turn ON, if there is bulk capacitance after ORing MOSFET, it cause power supply (front of ORing FET) to sag (voltage droop).
If there is a very big capacitance then it can happen.

Can you let us know the capacitance after ORing FET?

Regards,
Kari.

0 Karikalan Selvaraj over 5 years ago in reply to Karikalan Selvaraj

TI__Genius 16305 points

Hi

Could you help to reply here, so that we can support to resolve this startup issue.

If you think your question is answered or problem is resolved, click "this resolved my issue" button at the end.

Regards,
Kari.

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LM5050-1: LM5050-1 start up issue