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TPS 61088 输出电压始终不对



如图  输入是 5v

pcb上预留了短接点,短接9v 输出为5v 跟默认输出一样,短接12v 输出是8.2v ,请问tps 61088  的输出电压怎么去计算,还有电流,分别在pcb上哪几个元件,公式能写的通俗易懂点吗?