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TPS61158: TPS61158 Open Load Issue

Part Number: TPS61158

Dear TI Team,

The TPS61158 is designed and in use.
Vout: 18V
LED Load: 10mA

In the process of producing and testing the board, Anode / Gnd is measured by the tester with no load on the output and tested.
However, the chip dead with the OVP symptom without load.

After changing the test environment and loading the output, I confirmed that it operates normally in the same environment.
I want to check if the TPS61158 product can have a problem when it is open load.
Attach schematics and measurement waveforms.

CTRL Waveform

Output Load Waveform


Output Open Load Waveform

I would like to know why Chip dead.


  • Hi Yongsu,

        It is easy to observe that there are some ripple during MCU initialize, those random pulses may cause the devices to turn on and since those pulse maybe too narrow, it may lead our device can't detect the OVP phenomenon. If our device didn't detect the OVP issue, it may lead to hot and thermal issue, it may lead our devices to fail. So that's the reason.