TPS61021A: why input equal to output?

nightingale

Intellectual 415 points

Part Number: TPS61021A

Dear,

My customer use TPS61021A encounter a problem. The input equal to output. The target voltage is 4v.

The test result is as follow:

Input 3.2V, output is 3.2v, FB=1.6V , EN pin is high

The sch is as follow:

over 8 years ago

0 Helen chen over 8 years ago

TI__Mastermind 40080 points

The sch is OK except the EN resistor R361=1M is a little bit bigger. please change it to 100k. But htis will not effect the output. I think there may exist some solding problem, please resolder the R362 and R367 to check it again.

Or you can also add a 4V DC voltage at the output side, then check the FB voltage again. normally, if sold well, VFB=0.8V

0 nightingale over 8 years ago in reply to Helen chen

Intellectual 415 points

Thank you. The customer get wrong value of resistor.

0 Helen chen over 8 years ago in reply to nightingale

TI__Mastermind 40080 points

Fine, so I'll close the item.

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TPS61021A: why input equal to output?