TMC
TA431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
TA 431
DESCRIPTION
The TA431 is a three-terminal adjustable regulator with a guaranteed thermal stability over
applicable temperature ranges. The output voltage may be set to any value between V
REF
(approximately 2.5V) and 36V with two external resistors. This device has typical dynamic output
impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on characteristic, making
these devices excellent replacement for zener diodes in many applications.
FEATURE
Programmable output voltage to 36V
Low dynamic output impedance 0.2Ωtypical
Sink current capability of 1.0mA to 100mA
Equivalent full-range temperature coefficient of 500ppm/℃ typical
Temperature compensated for operation over full rated operating temperature range
Low output noise voltage
Fast turn on response
EQUIVALENT CIRCUIT
Q7
R6
12K
Q6
800 R4
R7
12K
Q5
Q3
C2
CATHODE
(Vz)
Vref
C1
R3
2.5K
R5
640
Q4
Q2
Q1
R2
1K
R1
3.3K
ANODE
(GND)
ABSOLUTE MAXIMUM RATINGS
1
TMC
Operating temperature range applies unless otherwise specified.)
Characteristic
Cathode Voltage
Cathode Current Range (continuous)
Reference Input Current Range
Power Dissipation
Operating Temperature Range
Store temperature Range
Symbol
Vka
Ika
I
REF
P
D
Topr
Tstg
TA431
Value
37
-10~+150
10
770
0~+70
-65~+150
Unit
V
mA
mA
mW
℃
℃
ELECTRICAL CHARACTERISTICS
(Ta=25℃ unless otherwise specified)
Parameter
Reference Voltage
Conditions
Vz=V
REF
Ii=10mA
Deviation of
Reference Input
Voltage Over
Temperature
Ratio of the Change
in Reference Voltage
to the Change in
Cathode Voltage
Reference Input
Current
Deviation of
Reference Input
Current Over
Temperature
Minimum Cathode
Current for
Regulation
Off-State Current
Dynamic Output
Impedance
0.5%
1.0%
2.0%
Vdev
Symbol
V
REF
Min
2.485
2.470
2.440
-
Typ
2.5
2.495
2.495
8.0
Max
2.51
2.52
2.55
17
mV
Unit
V
Vz=V
REF
, Ii=10mA
Iz=10mA
Vz=V
REF
~10V
Vz=10~36V
ΔV
REF
/
ΔVz
I
REF
-
-
-
-1.4
-1.0
2.0
-2.7
-2.0
4.0
mV/V
R1=10kΩ,R2=∞
I1=10mA
R1=10kΩ,R2=∞I1=10mA
μA
Δ
I
REF/
ΔT
-
0.4
1.2
μA
Vz=V
REF
Vz=36V,V
REF
=0V
Vz=V
REF
, Iz=1 to
100mA,f<1.0kHz
Iz(min)
Iz(off)
Rz
-
-
-
0.4
0.3
0.15
1.0
1.0
0.5
mA
μA
Ω
TEST CIRCUIT
2
TMC
I
I
IN
I
REF
V
REF
I
I
IN
R1
Iz
R2
V
REF
I
REF
TA431
IN
Iz
Vz
Iz OFF
Note: Vz=V
REF
(1+R1/R2)+I
REF
*R1
1.Test circuit for Vz=V
REF
2.Test circuit for Vz>V
REF
3.Test circuit for off-state
current
APPLICATION CIRCUIT
V+
V+
V
REF
R1
R2
Vo = ( 1+R1/R2 ) V
REF
0.01uF
R1
R2
Vo = ( 1+R1/R2 )
REF
V
Vo
Vo
30
1. Shunt Regulator
V+
IN
2. Series Regulator
LM7805
OUT
COMMON
Vo
V+
R1
IN
R2
Vth=2.5V
OUT
Von=2V
Voff=V+
GND
Vo = ( 1+R1/R2 )
REF
V
Vo
M IN
= V + 5 V
REF
3.Output Control of a Three
Terminal Fixed Regulator
4.Single Supply Comparator with
Temperature Compensated Threshold
5.Higher Current Shunt Regulator
6.Crow Bar
3
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