JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD
TO-92 Encapsulate Adjustable Reference Source
CJ431
Adjustable Accurate Reference Source
FEATURES
The output voltage can be adjusted to 36V
Low dynamic output impedance ,its typical value is 0.2Ω
Trapping current capability is 1 to 100mA
The typical value of the equivalent temperature factor in the
whole temperature scope is 50 ppm/
℃
The effective temperature compensation in the working
range of full temperature
Low output noise voltage
Fast on -state response
TO-92
1.REFERENCE
2.ANODE
3.CATHODE
1 2 3
ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference lnput Current Range
Power Dissipation
SYMBOL
V
KA
I
KA
Iref
P
D
R
θJA
Topr
Tstg
VALUE
37
-100-+150
0.05-+10
770
UNITS
V
mA
mA
mW
Thermal Resistance from Junction to Ambient
Operating temperature
Storage temperature Range
162
0~+70
-65-+150
℃/W
℃
℃
ELECTRICAL CHARACTERISTICS (Ta=25
℃
unless otherwise specified)
Parameter
Reference lnput Voltage
(Fig.1)
Deviation of reference input Voltage
Over temperature (note)
(Fig.1)
Ratio Of Change in Reference lnput
Voltage to the change in Cathode
Voltage
(Fig.2)
Reference lnput Current
(Fig.2)
Deviation Of Reference lnput Current
Over Full Temperature Range
(Fig.2)
Minimum cathode current for
regulation
(Fig.1)
Off-state cathode Current
(Fig.3)
Dynamic lmpedance
Symbol
V
ref
△
V
ref
/
△
T
Test
conditions
MIN
2.450
TYP
2.5
4.5
-1.0
-0.5
1.5
0.4
0.45
0.05
0.15
MAX
2.550
17
-2.7
-2.0
4
1.2
1.0
1.0
0.5
UNIT
V
mV
mV/V
mV/V
μA
μA
mA
μA
Ω
V
KA
=V
REF
, I
KA
=10mA
V
KA
=V
REF
, I
KA
=10mA
Tmin≤Ta≤Tmax
I
KA
=10mA
△
V
KA
=10V~V
REF
△
V
ref
/
△
V
KA
l
ref
△
l
ref
/
△
T
I
KA(min)
I
KA(OFF)
Z
KA
△V
KA
=36V~10V
I
KA
= 10mA,R
1
=10KΩ
R
2
=∞
l
KA
=10mA, R
1
=10KΩ
R
2
=∞
T
A
=full Temperature
V
KA
=V
REF
V
KA
=36V ,V
REF
=0
V
KA
=V
REF
, l
KA
=1 to 100mA
f≤1.0KHz
Note:T
MIN
=0
℃
,T
MAX
=+70
℃
CLASSIFICATION OF V
ref
Rank
Range
0.5%
2.487-2.513
1%
2.475-2.525
2%
2.450-2.550
C,Jan,2012
Figure 1. Test Circuit for VKA = Vref
Input
VKA
Figure 2. Test Circuit for VKA > Vref
Input
R1
Iref
IK
VKA
Figure 3. Test Circuit for Ioff
Input
Ioff
VKA
IK
Vref
R2
Vref
V
KA
+
V
ref
1
)
R1
)
I
ref
S
R1
R2
C,Jan,2012
Typical Characteristics
150
CJ431
Cathode Current versus
Cathode Voltage
I
K
, CATHODE CURRENT
(mA)
100
50
0
-50
V
KA
=V
ref
-100
-2
-1
0
1
2
T
a
=25
℃
3
V
KA
, CATHODE VOLTAGE
(V)
800
700
Cathode Current versus
Cathode Voltage
KA
(uA)
600
500
400
300
200
100
0
-100
-200
-1.0
KA
I
K
, CATHODE CURRENT
I
KA(min)
V
KA
=V
ref
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
T
a
=25
℃
3.0
ref
V
KA
, CATHODE VOLTAGE
(V)
2525
Reference Input Voltage versus
Ambient Temperature
Test Circuit for V
KA
=V
ref
V
ref
, REFERENCE INPUT VOLTAGE
(mV)
2500
2475
2450
V
KA
=V
ref
2425
-40
-20
0
20
40
60
80
I
K
=10mA
100
T
a
, AMBIENT TEMPERATURE
(
℃
)
C,Jan,2012
Typical Characteristics
0
CJ431
Change in Reference Input
Voltage versus Cathode Voltage
I
K
=10mA
T
a
=25
℃
(mV)
△
V
ref
, REFERENCE INPUT VOLTAGE
-4
-8
-12
-16
-20
0
5
10
15
20
25
30
35
40
V
KA
, CATHODE VOLTAGE
(V)
Test Circuit for V
KA
=V
ref
(1+R1/R2)+R1*I
ref
1.50
Reference Input Current versus
Ambient Temperature
(uA)
I
ref
, REFERENCE INPUT CURRENT
1.25
1.00
0.75
0.50
0.25
I
K
=10mA
0.00
-40
-20
0
20
40
60
80
100
T
a
, AMBIENT TEMPERATURE
(
℃
)
Test Circuit for I
ref
Off-State Cathode Current
versus Ambient Temperature
40
(nA)
I
off
, OFF-STATE CATHODE CURRENT
35
30
25
20
15
10
5
0
-40
V
KA
=36V
V
ref
=0V
-20
0
20
40
60
80
100
T
a
, AMBIENT TEMPERATURE
(
℃
)
Test Circuit for I
off
C,Jan,2012
APPICATION INFORMATION
1. Shunt Regulator
Note A : R Should provide cathode current 1mA to the TL431 at minimum V
I(BATT)
2.
Output Control of a Three-Terminal Fixed Regulator
3.
High-Current Shunt Regulator
C,Jan,2012
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