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LM5171: 升压电压无法维持到设定值

Part Number: LM5171

LM5171,我这边设计是放电时从19.4V(电池包端)升压到49.6V(负载端),充电时从51.2V降压到22V给电池充电。现在我这边测试放电负载功率1600W以下都能正常升压到49.6V,到1650W时,高压端的电压就维持不住掉到了40V左右。一下是两个不通功率时的上管、下管和电感电流的波形;这种情况应该调节哪部分外围电路?