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LM2585-ADJ一直被烧坏,电流特别大,求助

用LM2585-ADJ做一个两路输出的Flyback变换器原理图如图所示,输入电压18~25V,输出电压7.5V,变压器变比:1:0.313

当我用直流电源在输入端加入电压后,直流电源会显示有很大电流流过电路,然后器件4脚和3脚,也就是三极管被烧坏,请问一下这是钳位电路的问题嘛,我是将电压钳位到6V一下