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ADP1614 boost voltage

ADP1614 boost voltage input 5V output 15V and following Evaluation Board User Guide UG-437 to do circuit desing ,during application that I having a problem of boost voltage to 15V will instant current consumption around 1.2A at beginning and after few sceonds will reduce to 0.2A , What's problem to cause of this current consumption and how to improve during desing