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LM3481: Behavior at start up of PMP20183

Guru 16770 points
Part Number: LM3481
Other Parts Discussed in Thread: PMP20183,


We designed prototype board based on PMP20183 referring the following thread.

However, we found strange output ramp up at start up.  Please check the following image.

It wont be happen when input is 12V.

The circuit is almost the same as PMP20183 except for FB resistor, SD pin control part and  C2 and L1 mentioned in referred thread.

What do you think of cause? Is it likely to affect by current limit (ISEN)?