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LM5157: Load characteristics of lm5157

Part Number: LM5157

I am building a circuit that uses LM5157 to boost the voltage from Vin: 5V to 12V and Vout: 13.5V (Iout=1A).
When the load characteristics were confirmed through actual measurements, the characteristics were as follows.

A voltage drop of about 0.5V was observed between no load and 1A load.
Is the above behavior normal for an IC?

Also, is it possible to eliminate the voltage drop during load by adjusting the peripheral circuits?

Input voltage: 12V fixed

負荷 出力電圧
0 mA 13.530V
100 mA 13.531V
200 mA 13.531V
300 mA 13.526V
400 mA 13.421V
500 mA 13.351V
600 mA 13.253V
700 mA 13.206V
800 mA 13.117V
900 mA 13.043V
1000 mA 12.987V