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TPS61081: TPS61081 Boost problem

Part Number: TPS61081

Dear sir:

1.The following circuit:input:5V  design output:6.8V

   practical testing output7.8V

   question:Why the actual output voltage is greater than the design voltage?

2.The input voltage is modified to 3.3V, and the output is 6.8V. Based on this circuit, can the input voltage be directly reduced?