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TL431-Q1 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
TL431-Q1 ADJUSTABLE PRECISION SHUNT REGULATOR TI
Texas Instruments TI
TL431-Q1 Datasheet PDF : 23 Pages
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TL431-Q1
ADJUSTABLE PRECISION SHUNT REGULATOR
SGLS302C − MARCH 2005 − REVISED APRIL 2008
APPLICATION INFORMATION
VI(BATT)
R1A
TL431
R3
(see Note A)
R1B
R4
(see Note A)
R2A
R2B
ǒ Ǔ Low Limit +
1
)
R1B
R2B
Vref
ǒ Ǔ High Limit +
1
)
R1A
R2A
Vref
LED on When Low Limit < VI(BATT) < High Limit
NOTE A: R3 and R4 are selected to provide the desired LED intensity and cathode current 1 mA to the TL431 at the available VI(BATT).
Figure 26. Voltage Monitor
12 V
650
R
2 k
TL431
Off On
C
ǒ Ǔ Delay + R
C
In
12 V
12 V * Vref
Figure 27. Delay Timer
VI(BATT)
R1
RCL IO
0.1%
TL431
Iout
+
Vref
RCL
)
IKA
R1
+
VI(BATT)
IO
hFE
)
IKA
Figure 28. Precision Current Limiter
16
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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