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关于TPS54060效率的计算

Other Parts Discussed in Thread: TPS54140, TPS54060, TPS54160, TPS54260, TPS7A47, TPS7A33

如果输入电压是18V电流1.5A,输出的电压12V。这样的芯片效率怎么计算?电路图也不太懂哎。。。这个芯片能输出正负12V吧?