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ucc27424与UCC27210集合的焊接电源驱动电路问题,请求帮助

Other Parts Discussed in Thread: UCC27210, UCC27424, UCC27201, UCC27324

您好,我使用TI的UC3875PWM控制器输出经光耦隔离给如上的电路,可上电发现只要一接上+12的电压,UCC27210芯片就会烧掉或者UCC27424输出与输入的频率不一致,请问这是怎么回事啊,难道我的电路设计的有问题?请您帮我看看,谢谢

图片请见附件