W7805 22020V Uxx 43.3kQ )# 5.1kQ Uo 000ul 3.3 kQ 图5:习题18.36图 R+Rp+R2 3.3+5.1+33 Ri+Rp 51+3.3×5V=6.96V Ri+Rp+ R2 3.3+51+33 5V=17.73V图 5: 习题18.3.6图 UOmin = R1 + Rp + R2 R1 + Rp UXX = 3.3 + 5.1 + 3.3 5.1 + 3.3 × 5V = 6.96V UOmax = R1 + RP + R2 R1 UXX = 3.3 + 5.1 + 3.3 3.3 × 5V = 17.73V 8