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TPS61085

Other Parts Discussed in Thread: TPS61085, SWITCHERPRO

输入3.8V,根据参考电路,R1取54.9K,R2取18.2K,计算输出应该是5V,但是输出等于输入,只有3.8V

当输入5V时,输出也是5V

我也不确定买的到底是不是正品,请问正品丝印怎样的?