Typical Application
VO = ⎝⎛1 + RR-----12-⎠⎞ Vref
LM431A/B/C
Figure 11. Shunt Regulator
LM431A/LM431B/LM431C
VO
=
Vre
f
⎛
⎝
1
+
RR-----12-⎠⎞
LM7805/MC7805
VO = ⎝⎛1 + RR-----12-⎠⎞ Vref
LM431A/B/C
LM431A/B/C
Figure 12. Output Control for
Three--Te r- minal Fixed Regulator
Figure 13. High Current Shunt Regulator
LM431A/B/C
Figure 14. Current Limit or Current Source
LM431A/B/C
Figure 15. Constant-Current Sink
7