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移相全桥加很小的负载占空比就到最大了

Other Parts Discussed in Thread: UCC28950

本人用UCC28950做的一款移相全桥DC/DC,调试时发现加很小的负载占空比就已经接近0.5了,请问有可能是哪些原因造成的?

http://www.deyisupport.com/question_answer/f/24/t/19672.aspx

http://www.deyisupport.com/question_answer/f/24/p/18772/63315.aspx#63315