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UCC28740只工作在恒流模式

Other Parts Discussed in Thread: PMP9144

根据PMP9144制作的反激式开关电源,做出来后发现只工作在CC模式,具体体现在空载时输出14.5V,当负载小于7Ω,电源输出恒定电流2.4A,电压随着负载变化而变化,当负载大于7Ω时,因超过电压限制而截止输出,而不是转换为恒压模式输出14.5V,求解决,谢谢!(除了变压器匝数官方并没有说明以外,参数完全与官方方案一致)

www.ti.com.cn/.../PMP9144 Documents