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电源新手求助UCC28740使用WEBENCH®︎工具设计的AC24V-48V 转 DC12V 0.4A 输出电压只有3V 多点



1)示波器测量DEV 管脚有输出脉冲(间隔几个 us)3个一组,但是两组间隔时间挺长。

2)VDD 示波器显示锯齿波  7V-21V,周期260mS。

3)输出总是在3.3V。

感谢帮忙解答一下。