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LM5022转换效率只有80%,怎样提高效率。

我做的是DC-DC,Vin23-33V,,Vout48V,Pout200W。板子做出来后效率只有80%。下面是原理图和测试的波形图。

通道1:VGS    2:VG      3:GND(VIN)-GND(VOUT)

通道1:VGS    2:VG      3:GND(VIN)-GND(VOUT)