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TPS40055: TPS40055这种同步整流的电源SW的反向过冲该怎么去抑制

Part Number: TPS40055

输入电压为24V的TPS40055电源,拉载10A电流时,SW波形上升沿几乎没有过冲,下降沿反向过冲超限,为-2.6V,电流加大到15A时,反向过冲高达-3.8V,请问对于TPS40055这种同步整流的电源SW的反向过冲该怎么去抑制,或者说在设计时怎么使反向过冲最小?