Datasheet

V
O
TL431
V
I(BATT)
V
IT
≈ 2.5 V
GND
Input
V
on
≈2 V
V
off
≈V
I(BATT)
R1
0.1%
R2
0.1%
R
(see Note A)
V
ref
V
O
TL431
V
I(BATT)
RETURN
O ref
R1
V = 1 + V
R2
æ ö
ç ÷
è ø
TL431, TL431A, TL431B
TL432, TL432A, TL432B
SLVS543M –AUGUST 2004–REVISED JULY 2012 www.ti.com
APPLICATION INFORMATION
Table 2. Table of Application Circuits
APPLICATION FIGURE
Shunt regulator Figure 20
Single-supply comparator with temperature-compensated threshold Figure 21
Precision high-current series regulator Figure 22
Output control of a three-terminal fixed regulator Figure 23
High-current shunt regulator Figure 24
Crowbar Circuit Figure 25
Precision 5-V, 1.5-A regulator Figure 26
Efficient 5-V precision regulator Figure 27
PWM converter with reference Figure 28
Voltage monitor Figure 29
Delay timer Figure 30
Precision current limiter Figure 31
Precision constant-current sink Figure 32
A. R should provide cathode current ≥1 mA to the TL431 at minimum V
(BATT)
.
Figure 20. Shunt Regulator
Figure 21. Single-Supply Comparator With Temperature-Compensated Threshold
28 Submit Documentation Feedback Copyright © 2004–2012, Texas Instruments Incorporated
Product Folder Link(s): TL431 TL431A TL431B TL432 TL432A TL432B