TL431_11 Datasheet, PDF (28/79 Pages) Fairchild Semiconductor – Programmable Shunt Regulator

TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543L – AUGUST 2004 – REVISED FEBRUARY 2011
APPLICATION INFORMATION
Table 2. Table of Application Circuits
APPLICATION
Shunt regulator
Single-supply comparator with temperature-compensated threshold
Precision high-current series regulator
Output control of a three-terminal fixed regulator
High-current shunt regulator
Crowbar Circuit
Precision 5-V, 1.5-A regulator
Efficient 5-V precision regulator
PWM converter with reference
Voltage monitor
Delay timer
Precision current limiter
Precision constant-current sink
R
(see Note A)
V_I(BATT)
V_{r ef}
R1
0.1%
V_O
TL431
V_O
=
æ
çè^{1 +}
R1 ö
R2 ^÷ø
V_ref
R2
0.1%
RETURN
A. R should provide cathode current ≥1 mA to the TL431 at minimum V_(BATT).
Figure 17. Shunt Regulator
V_I(BATT)
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FIGURE
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
TL431
Input
V_IT ≈ 2.5 V
V_O
V_on ≈2 V
V_off ≈V_I(BATT)
GND
Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold
28
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