2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.3
Features
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.20 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/TL431Aare 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 0.2W Active output circuitry
provides a very sharp turn-on characteristic, making these
devices excel lent replacement for zener diodes in many
applications.
TO-92
8-DIP
8-SOP
1. Ref 2. Anode 3. Cathode
1. Cathode 2. 3. 6. 7. Anode
8. Ref 4. 5. NC
1
1
1
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
TL431/TL431A
Programmable Shunt Regulator
TL431/TL431A
2
Internal Block Diagram
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Recommended Operating Conditions
Parameter
Symbol
Value
Unit
Cathode Voltage
V
KA
37
V
Cathode Current Range (Continuous)
I
KA
-100 ~ +150
mA
Reference Input Current Range
I
REF
-0.05 ~ +10
mA
Power Dissipation
D, LP Suffix Package
P Suffix Package
P
D
770
1000
mW
mW
Operating Temperature Range
T
OPR
-25 ~ +85
C
Junction Temperature
T
J
150
C
Storage Temperature Range
T
STG
-65 ~ +150
C
Parameter
Symbol
Min
Typ
Max
Unit
Cathode Voltage
V
KA
V
REF
-
36
V
Cathode Current
I
KA
1.0
-
100
mA
TL431/TL431A
3
Electrical Characteristics
(T
A
= +25
C, unless otherwise specified)
T
MIN
= -25
C, T
MAX
= +85
C
Parameter
Symbol
Conditions
TL431
TL431A
Unit
Min. Typ. Max. Min. Typ. Max.
Reference Input Voltage
V
REF
V
KA
=V
REF
, I
KA
=10mA
2.440 2.495 2.550 2.470 2.495 2.520
V
Deviation of Reference
Input Voltage Over-
Temperature (Note 1)
V
REF
/
T
V
KA
=V
REF
, I
KA
=10mA
T
MIN
T
A
T
MAX
-
4.5
17
-
4.5
17
mV
Ratio of Change in
Reference Input Voltage
V
REF
/
V
KA
I
KA
=10mA
V
KA
=10V-
V
REF
-
- 10
-2.7
-
-1.0
-2.7
mV/V
to the Change in
Cathode Voltage
V
KA
=36V-
10V
-
-0.5
-2.0
-
-0.5
-2.0
Reference Input Current
I
REF
I
KA
=10mA,
R
1
=10K
,R
2
=
-
1.5
4
-
1.5
4
A
Deviation of Reference
Input Current Over Full
Temperature Range
I
REF
/
T
I
KA
=10mA,
R
1
=10K
,R
2
=
T
A
=Full Range
-
0.4
1.2
-
0.4
1.2
A
Minimum Cathode Cur-
rent for Regulation
I
KA(MIN)
V
KA
=V
REF
-
0.45
1.0
-
0.45
1.0
mA
Off - Stage Cathode
Current
I
KA(OFF)
V
KA
=36V,
V
REF
=0
-
0.05
1.0
-
0.05
1.0
A
Dynamic Impedance
(Note 2)
Z
KA
V
KA
=V
REF
,
I
KA
=1 to 100mA
f
1.0KHz
-
0.15
0.5
-
0.15
0.5
TL431/TL431A
4
Test Circuits
Figure 1. Test Circuit for V
KA
=V
REF
Figure 2. Test Circuit for V
KA
V
REF
TL431/A
TL431/A
TL431/A
Figure 3. Test Circuit for l
KA(OFF)
TL431/TL431A
5
Typical Perfomance Characteristics
Figure 1. Cathode Current vs. Cathode Voltage
Figure 3. Change In Reference Input Voltage vs.
Cathode Voltage
Figure 5. Small Signal Voltage Amplification vs. Frequency
Figure 2. Cathode Current vs. Cathode Voltage
Figure 4. Dynamic Impedance Frequency
Figure 6. Pulse Response
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