TL1431 Datasheet, PDF (12/28 Pages) STMicroelectronics – PROGRAMMABLE VOLTAGE REFERENCE

TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062L – DECEMBER 1991 – REVISED OCTOBER 2007
APPLICATION INFORMATION
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
Higher-current shunt regulator
Crowbar
Precision 5-V, 1.5-A, 0.5% regulator
5-V precision regulator
PWM converter with 0.5% reference
Voltage monitor
Delay timer
Precision current limiter
Precision constant-current sink
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FIGURE
16
17
18
19
20
21
22
23
24
25
26
27
28
V_(BATT)
R
R1
0.1%
V_I(ref)
R2
0.1%
V_O
TL1431
ǒ Ǔ VO +
1
)
R1
R2
VI(ref)
A. R should provide cathode current ≥1 mA to
the TL1431 at minimum V_(BATT).
Figure 16. Shunt Regulator
V_(BATT)
Input
V_O
V_on ≈ 2 V
V_off ≈ V_(BATT)
TL1431
V_IT = 2.5 V
GND
Figure 17. Single-Supply Comparator With
Temperature-Compensated Threshold
12
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