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TPS709: behavior without load

Expert 4650 points
Part Number: TPS709

Goal is to create 3.3V from 15V

If operated without load it only regulates up to a Vin of 9.7V the output correctly.

Beyond that the Vout increases according to Vin.

If the output load is 660 Ohm everything is fine.

Are there some minimum requirements I have overlooked?