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LM2596-5.0芯片发烫属于正常现象吗?

Other Parts Discussed in Thread: LM2596

我用两个LM2596-5.0芯片产生一个负5V的电压和一个正5V的电压,在空载的情况下为什么正5V的芯片一点都不烫,但是产生负5V的电压的芯片十分发烫,这属于正常现象吗?