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LM5022: LM5022 for PoE application

Part Number: LM5022

VIN=20~57V

VOUT=57V

Power Output =32W

Duty (VIN 57V) = 10%

Duty(VIN 20V)  = 34%

Efficiency (VIN 57V) =77%

Efficiency (VIN 20V) =88%

How could I tune duty for increase the efficiency (VIN 57V) ?