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LM2672-3.3没有电压输出

Other Parts Discussed in Thread: LM2672

我用LM2672-3.3设计了一个电源电路,是按照数据手册中的经典电路设计的,12V输入,3.3V输出,负载电流是1A(我也不是很确定负载是否要这么大的电流)。焊好电路后,上12V电压,但没电压输出,请教有用过该芯片的工程师解答。