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LM3691 Start Up operation

Hi 

We found a unknown operation at start up.  (Vin ramp up very slowly.)

Yellow: Vin, Blue:Vout, Pink: Iin

There is two step operation. It looks that different current limit works at each step.

(MODE pin is connected to Vin directly.)

Is it in ECO mode when it startup? Why is this happen?

Regards,

Koji Hamamoto