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LP3875



老师,您好

这个芯片的SD脚怎么设计啊?我的设计就是需要其输出1.9V电压即可,还有就是确定Cff的时候为什么使用:

Fz = 45,000 = 1 / ( 2 x π x R1 x CFF ) 这个公式啊,45000是怎么来的啊?