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TPS562209 Vout ramp up

Other Parts Discussed in Thread: TPS562209

Hi,

i have designed a DCDC based on TPS562209 to convert 12V to ~3.64V as show in the attached image.

the problem is when touching the FB resistor, R71, with bare hands or a pro the output is ramped up.

i also noticed that the FB voltage is getting very noisy with a high amplitude noise.

how this can be explained?

how can i solve this?