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lm2506adj的问题



datasheet上有

V=Vfb(1+R2/R1),
Vfb=1.23V
我想问的是fb可以通过单片机直接输出电压(在1.180到1.280之间变化)到fb吗?
公式中的vfb是不是固定的?
对于vfb的极限电压如V(min)1.193/1.180,是不是意味着
V(min)在1.193到1.18之间变化,不同芯片不一样