www.fairchildsemi.com
TL431/TL431A
Programmable Shunt Regulator
Features
•
•
•
•
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.2
Ω
Typical
Sink Current Capability of 1.0 to 100mA
Equivalent Full-Range Temperature Coefficient of
50ppm/°C Typical
• Temperature Compensated For Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
Description
The TL431/TL431A are three-terminal adjustable regulator
series with a guaranteed thermal stability over applicable
temperature ranges. The output voltage may be set to any
value between V
REF
(approximately 2.5 volts) and 36 volts
with two external resistors These devices have a typical
dynamic output impedance of 0.2
Ω
. Active output circuitry
provides a very sharp turn-on characteristic, making these
devices excel lent replacement for zener diodes in many
applications.
TO-92
1
1. Ref 2. Anode 3. Cathode
8-DIP
1
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
8-SOP
1
1. Cathode 2. 3. 6. 7. Anode
8. Ref 4. 5. NC
Rev. 1.0.4
©2011 Fairchild Semiconductor Corporation
TL431/TL431A
Internal Block Diagram
+
-
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
D, LP Suffix Package
P Suffix Package
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
P
D
T
OPR
T
J
T
STG
Value
37
-100 ~ +150
-0.05 ~ +10
770
1000
-25 ~ +85
150
-65 ~ +150
Unit
V
mA
mA
mW
mW
°C
°C
°C
Recommended Operating Conditions
Parameter
Cathode Voltage
Cathode Current
Symbol
V
KA
I
KA
Min
V
REF
1.0
Typ
-
-
Max
36
100
Unit
V
mA
2
TL431/TL431A
Test Circuits
TL431/A
TL431/A
Figure 1. Test Circuit for V
KA
=V
REF
Figure 2. Test Circuit for V
KA
≥V
REF
TL431/A
Figure 3. Test Circuit for l
KA(OFF)
4
TL431/TL431A
Typical Perfomance Characteristics
Figure 1. Cathode Current vs. Cathode Voltage
Figure 2. Cathode Current vs. Cathode Voltage
Figure 3. Change In Reference Input Voltage vs.
Cathode Voltage
Figure 4. Dynamic Impedance Frequency
Figure 5. Small Signal Voltage Amplification vs. Frequency
Figure 6. Pulse Response
5
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