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UC2842输出脉冲问题

Other Parts Discussed in Thread: UC2842

我制作的反激式开关电源,选用UC2842.但输出的脉冲不标准。如下图所示。请问可能是什么原因?和辅助电源有关系吗?(我使用的是TI参考资料上提供的电路原理)