LM46002-Q1: LM46002-Q1 abnormal output

user5195014

Intellectual 450 points

Part Number: LM46002-Q1
Other Parts Discussed in Thread: LM46002

Dears

When i only provide 24V input and didn't enable ti ,i found Vout has 1.7V voltage. Dose it normal output?

This moment every pin output voltage as below

my schematic as below ,pls help to check my design

over 7 years ago

0 Timothy Hegarty over 7 years ago

TI__Guru* 77252 points

Hello,

Is the test condition at no load on the output? If so, a rapidly rising input voltage can couple a current capacitvely across the high-side FET and inductor to the output cap.

Regards,
Tim

0 user5195014 over 7 years ago in reply to Timothy Hegarty

Intellectual 450 points

You mean that it is normal for the pin to have voltage without load, but in practical application, if there is a voltage of 1.652V, my peripheral may work. Is there any solution to this situation?

0 Arief Hernadi over 7 years ago in reply to user5195014

TI__Mastermind 23845 points

Hi,

When you power up VIN, could you check the SW node waveform and see if there is any switching action in there while your EN pin is low?

Is there a way to isolate the output of LM46002 from other circuitry to prevent any back feeding from other peripheral?

Thanks

-Arief

Power management

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LM46002-Q1: LM46002-Q1 abnormal output