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UCC28250如何实现输出侧预偏置电压起动?
当UCC28250是副边控制,预偏置采用双环控制策略,即原边占空比由电压环控制,副边整流管占空比由独立的反馈环控制,二者配合以实现输出“能量”从合适值开始而不会引起倒灌。
需要注意,由于涉及到双环控制,要防止正反馈的产生,通过限制VSNS引脚电压低于FB引脚电压即可达到目的。