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TPS61089: The output falls regularly

Timsen

Expert 1660 points

Part Number: TPS61089

Dear all：

I used TPS61089 to design the 4V booster circuit of 9V, as shown in the figure below.During the test, it was found that I used the voltage regulator to input 4V, and the output voltage was loaded. The output voltage would drop regularly, please help me check it？

Thank you！

over 6 years ago

0 Jasper Li over 6 years ago

TI__Mastermind 46905 points

Hi,

please attach the schematic again, I didn't see it.

what is output current if loaded? do you find this behavior in several boards?

0 Timsen over 6 years ago in reply to Jasper Li

Expert 1660 points

Hi Jasper：

the schematic as above. if loaded the output current is about 0.5A

0 Jasper Li over 6 years ago in reply to Timsen

TI__Mastermind 46905 points

Hi

1. check if the behavior can be found in other boards.

2. if yes, measure the waveform in VIN and VOUT, then share with me

0 Helen chen over 6 years ago in reply to Jasper Li

TI__Mastermind 40080 points

Dear Sir,

1. Please also check the maximum output current capability of your source, make sure it is OK to supply the load.

2. Check the soldering of the current limit resistor.