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UCC28910问题,求助

Other Parts Discussed in Thread: UCC27524, UCC28910

HI!

我采用UCC28910设计的辅助电源,给UCC27524供电,用两个双绕组脉冲变压器作为4个全桥MOS管的驱动。

测试辅助电源时,用功率电阻作为负载,UCC28910辅助电源能正常输出12V/7W的功率。在4个全桥MOS不连接AC整流出来的高压直流电时,测量MOS管端的驱动波形正常,电源工作良好。但是一旦将全桥MOS管接入交流电整流滤波后的高压直流电,辅助电源则不断重启。用外部12V电源代替UCC28910设计的辅助电源,则整个电路能正常工作。

请各位帮忙解答出了何问题,如何解决。谢谢!