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反激隔离电源UCC2803低压满载启动问题

Other Parts Discussed in Thread: UCC2803

向电源工程师求助:

问题描述:目前在设计一款低压的辅助电源,输入电压范围为6V-36V,多路输出且相互隔离,总输出功率为12W,选用的是UCC2803(UCC2803的启动电压很低,5V就能启动,占空比能达到90%),在输入电压低于7V时,不能启动(供电电源出现限流模式),提高输入电压(超过10V)能启动,启动后降低输入电压到6V,也能正常工作,6V时的占空比也不是特别大,请问各位工程师为什么在6V的时候不能启动?

原理图如下:

原理图页.docx