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DLP3030-Q1: PMOS and 15uH inductor parameters

Part Number: DLP3030-Q1
Other Parts Discussed in Thread: DLP5530PROJQ1EVM

HI : 

        I have two questions,please help to check.

1. Reference design page NO.Q3 PMOS SQD50P06-15L-GE3,ID=50A, this material is difficult to buy, why use such a large current PMOS ? According to the "dlpa084" document, the maximum power consumption is only 7.1W.Can the PMOS used here be replaced with a smaller ID current MOS?

2. Similarly, L2 also uses a high-current 15uH inductor XAL1010-153MEB. Why use such a high-current inductor? Can I use a lower current inductor?