TL1431-EP_15 Datasheet, PDF (14/23 Pages) Texas Instruments – TL1431-EP Precision-Programmable Reference

TL1431-EP
SLVS529D – APRIL 2004 – REVISED JANUARY 2015
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Typical Application (continued)
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R₂ = V_REF / (I_FB – I_REF)
(9)
R₂ = 2.473 V / (0.2 mA – 4 µA)
(10)
Using Equation 9 and Equation 10, the value of R₂ = 12.617 kΩ
The closest standard 1% resistor values are R₁ = 46.4 kΩ and R₂ = 12.7 kΩ. Other resistor combinations may
provide a shunt voltage that is centered better. A formula to test for R₁ values that may be closer to standard
values using standard R₂ resistors is R₁= (V_KA – V_REF) / (V_REF / R₂ + I_REF).
10.2.3 Application Curves
100
A
90
B
80
C
D
70
60
Stable
50
Stable
40
30
20
10
0
0.001
0.01
0.1
1
10
Load Capacitance (2F)
D012
Figure 22. Stability Bounderies for load capacitance on
Shunt Regulator
6
Output
Input
5
4
3
2
1
0
-1
0
1
2
3
4
5
6
7
Time (2s )
D011
Figure 23. Pulse Response at Startup of Shunt Regulator
11 Power Supply Recommendations
Do not exceed the values listed in the Recommended Operating Conditions and Electrical Characteristics. To
ensure proper operation, deliver a minimum of 1 mA of current to the cathode. Ensure that the power source can
provide at least 1 mA of current across the entire voltage range.
14
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