TL1431_12 Datasheet, PDF (11/27 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

www.ti.com
TL1431
SLVS062M – DECEMBER 1991 – REVISED APRIL 2012
12 V
6.8 kΩ
5 V +0.5%
TL1431
10 kΩ
10 kΩ
0.1%
10 kΩ
0.1%
X
Not
Used
V_CC
−
+
TL598
Feedback
Figure 27. PWM Converter With 0.5% Reference
A. Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL1431.
R3
V_(BATT)
12 V
680 Ω
R1A
R1B
R4
R
2 kΩ
TL1431
TL1431
TL1431
R2A
R2B
ǒ Ǔ Low Limit +
1
)
R1B
R2B
VI(ref)
ǒ Ǔ High Limit +
1
)
R1A
R2A
VI(ref)
LED on When
Low Limit < V_(BATT) < High Limit
V_(BATT)
Figure 28. Voltage Monitor
R_CL 0.1%
I_O
R1
On
Off
C
Delay + R
C
II
(12
12 V
V) * VI(ref)
Figure 29. Delay Timer
V_(BATT)
I_O
TL1431
IO
+
VI(ref)
RCL
)
IKA
ǒ Ǔ ^{R1 +}
V(BATT)
IO
hFE
) IKA
Figure 30. Precision Current Limiter
TL1431
R_S
0.1%
IO
+
VI(ref)
RS
Figure 31. Precision Constant-Current Sink
Copyright © 1991–2012, Texas Instruments Incorporated
Product Folder Link(s): TL1431
Submit Documentation Feedback
11