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UCC2802电源设计

Other Parts Discussed in Thread: UCC2802

1、关于UCC2802芯片VCC管脚接输入问题,目前我的输入电压范围18~72V,所以直接接VCC是否需要通过三极管启动方式,同时变压器辅助供电绕组并联在VCC管脚;

2、关于UCC2802此款芯片制作欠压保护的方法,是否有较为简便的实现方法?