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ucc27211同步buck带载后输出和输入异常

Other Parts Discussed in Thread: UCC27211

stm32和ucc27211搭建同步buck拓补,空载上电正常,带载后未知原因的mos驱动不正常(12v输出 20欧姆负载,此电路曾用ir2104驱动成功过),

可以确定低边输入信号原为3.3v 20k 50%占空比,在输入引脚上测得为1.3v左右 20%左右 10k pwm(像每两个波丢失一个波一样), 并且低边输入引脚对地电阻变为100欧左右。

请问有什么debug思路吗