TL1431-Q1 Datasheet, PDF (14/19 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL1431ĆQ1
PRECISION PROGRAMMABLE REFERENCE
SLVS534B − JUNE 2004 − REVISED APRIL 2008
APPLICATION INFORMATION
V(BATT)
R1A
TL1431
R3
R1B
R4
TL1431
12 V
R
680 Ω
2 kΩ
R2A
R2B
TL1431
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
NOTE A: Select R3 and R4 to provide the desired LED intensity and
cathode current ≥1 mA to the TL1431.
Figure 25. Voltage Monitor
On
C
Off
Delay + R
C
II
(12
12 V
V) * VI(ref)
Figure 26. Delay Timer
V(BATT)
R1
RCL 0.1%
IO
V(BATT)
IO
TL1431
IO
+
VI(ref)
RCL
)
IKA
ǒ Ǔ ^{R1 +}
V(BATT)
IO
hFE
) IKA
Figure 27. Precision Current Limiter
TL1431
RS
0.1%
IO
+
VI(ref)
RS
Figure 28. Precision Constant-Current Sink
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