TL1431M_15 Datasheet, PDF (14/32 Pages) Texas Instruments – PRECISION PROGRAMMABLE REFERENCE

TL1431
SLVS062M – DECEMBER 1991 – REVISED APRIL 2012
12 V
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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 24. 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.
V_(BATT)
R1A
R3
R1B
R4
12 V
R
680 Ω
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
Figure 25. Voltage Monitor
V_(BATT)
R1
R_CL 0.1%
I_O
On
Off
C
Delay + R
C
II
(12
12 V
V) * VI(ref)
Figure 26. Delay Timer
V_(BATT)
I_O
TL1431
IO
+
VI(ref)
RCL
)
IKA
ǒ Ǔ ^{R1 +}
V(BATT)
IO
hFE
) IKA
Figure 27. Precision Current Limiter
TL1431
R_S
0.1%
IO
+
VI(ref)
RS
Figure 28. Precision Constant-Current Sink
14
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