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TPS40210的效率不高,只有88%,如何提高?

Other Parts Discussed in Thread: TPS40210, TPS40211

如图所示输入12V,电流输出464mA,R6的阻值为1.5欧姆。L1为22uH,Q1是用BSC031N06NS3.但是输出效率不高只有88%。GDRV的波形如下。求大神指点,如何进一步提高效率?求指导。