LP2951-Q1: LP2951 output problem

Yuhao Wang

Part Number: LP2951-Q1
Other Parts Discussed in Thread: LP2951

Hello,

Good day, Customer have a problem in LP2951, when they give a 5V on output they found there is a -5V on input. they want to know why could this happen.

over 1 year ago

0 Erin Thibeault over 1 year ago

TI__Expert 6570 points

Hi Yuhao,

Thanks for reaching out. Are you able to share your schematic?

BR,

Erin

0 Yuhao Wang over 1 year ago in reply to Erin Thibeault

TI__Prodigy 330 points

Hi Erin,

The schematic is not complete I can only give the schematic shown below.

0 Erin Thibeault over 1 year ago in reply to Yuhao Wang

TI__Expert 6570 points

Hi Yuhao,

It looks like you have configured this device per the datasheet. It is my understanding you connecting a 5V supply to Vout, effectively operating Vout as the input. Is this correct? How are you measuring Vin? Are you measuring Vin relative to ground?

BR,

Erin

0 Yuhao Wang over 1 year ago in reply to Erin Thibeault

TI__Prodigy 330 points

Yes the measurement of Vin is relative to the ground.

0 Erin Thibeault over 1 year ago in reply to Yuhao Wang

TI__Expert 6570 points

Hi Yuhao,

It is my understanding you connecting a 5V supply to Vout, effectively operating Vout as the input. Is this correct?

BR,

Erin

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LP2951-Q1: LP2951 output problem