TPS63020 current oscillation

Jacky Chen29

Other Parts Discussed in Thread: TPS63020

Hola,

Our customer used TPS63020 as their design solution and they found the current oscillation when test transient response. Does anyone can help provide some solutions to solve this problem？thanks ～

over 10 years ago

0 Chris Glaser over 10 years ago

TI__Guru**** 150620 points

Thank you for a good post title and a waveform, but we'll need your schematic, test setup, and labels on the waveform to try and figure out what you are seeing.

0 Jacky Chen29 over 10 years ago in reply to Chris Glaser

Genius 4735 points

Hola Chris,

Below figure is the test environment for your kind information.

0 Chris Glaser over 10 years ago in reply to Jacky Chen29

TI__Guru**** 150620 points

Ah, so you are testing the EVM with the only modifications being to the FB resistors and to add that RC network? What is your Vin, when measured on the input terminals of the EVM?

Does the waveform show Vout and Iout? If so, it seems your electronic load is pulling a current which is not DC. Try with a resistive load instead.

Finally, I see 3.968 on the load. Is this the load current? This is well above the capability of the TPS63020.

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TPS63020 current oscillation