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我用2576做一个正负5V输出，正负12V输出，当输入电压小于30V时，四路输出均正常，但一旦电压从30V开始，负压立马没有输出，且负压芯片GND脚和OUTPUT脚立马短路通了，但是正压输出还是正常的，请问这是什么原因呢？？？
