TI的工程师，你们好：
我最近按照手册用UCC28019搭建了一个输入AC24V，输出DC36V的PFC电路。
空载输出正常36V，接重载时也能稳定在36V，但是所用的变压器会发出“滋滋”的响声。
用示波器查看了下8引脚的PWM输出，发现频率是50hz，请问这正常，不应该是65khz的吗，还有变压器发出滋滋声响改如何解决
望大神不吝赐教，谢谢！
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