CYStech Electronics Corp.
Adjustable Precision Shunt Regulators
Spec. No. : C502A3
Issued Date : 2003.03.26
Revised Date : 2005.06.29
Page No. : 1/6
TL431XA3
Description
The TL431 series are three-terminal adjustable regulators with guaranteed
TO-92
thermal stability over applicable temperature ranges. The output voltage
may be set to any value between V
REF
(approximately 2.495 volts) and 36 volts with two external resistors.
These devices have a 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.
Features
•
Programmable output voltage
•
Temperature coefficient is 50ppm/°C typical
•
Temperature compensated for operation over
•
full temperature range
•
Low output noise voltage
•
Fast turn on response
•
Pb-free package
Classification
Rank
V
REF
A
2.495±0.5%
B
2.495±1%
C
2.495±2%
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified)
Characteristics
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
Operating Temperature Range
Storage Temperature Range
TL431A3
Symbol
V
KA
I
K
I
REF
P
D
T
opr
T
stg
Value
37
-100~+150
0.05~+10
770
0~+70
-65~+150
Unit
V
mA
mA
mW
°C
°C
CYStek Product Specification
CYStech Electronics Corp.
Functional Block Diagram
Functional Block Diagram :
Cathode
Reference
V
REF
+
-
Anode
Spec. No. : C502A3
Issued Date : 2003.03.26
Revised Date : 2005.06.29
Page No. : 2/6
& Symbol
Symbol :
Cathode
Reference
Anode
Test Circuits
IN
I
REF
I
Z
V
REF
R2
I
I
V
Z
IN
R1
I
I
V
Z
I
REF
I
Z
V
REF
IN
V
Z
Fig1. Test Circuit for V
Z
=V
REF
Fig 2. Test Circuit for V
Z
>V
REF
Note : V
Z
=V
REF
(1+R
1
/R
2
)+I
REF
xR
1
Fig3. Test Circuit for Off-State
Current
Electrical Characteristics
( Ta=25°C unless otherwise specified )
Characteristics
Symbol
Test Conditions
Reference Input Voltage TL431A
V
REF
V
KA
=V
REF
, I
K
=10mA
TL431B
TL431C
V =V , I =10mA
Deviation of Reference Input Voltage
V
REF(dev) KA REF K
Over-Temperature
T
min
≤T
a
≤T
max
I
K
=10mA,
Ratio of Change in Reference Input
∆V
REF
/
∆V
KA
=10V-V
REF
Voltage to the Change in Cathode
∆V
KA
I
K
=10mA,
Voltage
∆K
KA
=36V-10V
I
K
=10mA, R
1
=10kΩ,
Reference Input Current
I
REF
R
2
=∞
Deviation of Reference Input Current
I =10mA, R
1
=10kΩ,
I
REF(dev) K
Over Full Temperature Range
R
2
=∞, T
a
=Full Range
Minimum Cathode Current for
I
K(min)
V
KA
=V
REF
Regulation
Off-State Cathode Current
I
K(off)
V
KA
=36V, V
REF
=0
V
KA
=V
REF
, f≤1.0KHz
Dynamic impedance
Z
KA
I
K
=1 to 100mA
TL431A3
Min Typ Max Unit
2.445 2.495 2.545
2.470 2.495 2.520 V
2.480 2.495 2.510
-
-
-
-
-
-
-
-
4
-1.4
-1.0
2
0.4
0.4
0.1
0.2
17
-2.7
-2.0
4
1.2
1.0
1.0
0.5
mV
mV
V
µA
µA
mA
µA
Ω
CYStek Product Specification
CYStech Electronics Corp.
Characteristic Curves
CATHODE CURRENT vs
CATHODE VOLTAGE
800
I
K
- COTHODE CURRENT (uA)
700
600
500
400
300
200
100
0
-100
-200
-1
-0.5
0
0.5
1
Spec. No. : C502A3
Issued Date : 2003.03.26
Revised Date : 2005.06.29
Page No. : 3/6
CATHODE CURRENT vs
CATHODE VOLTAGE
150
I
K
- COTHODE CURRENT (mA)
125
100
75
50
25
0
-25
-50
-75
-100
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
V
AK
- CATHODE VOLTAGE (V)
1.5
2
2.5
3
V
AK
- CATHODE VOLTAGE (V)
REFERENCE INPUT VOLTAGE
vs AMBIENT TEMPERATURE
REFERENCE INPUT CURRENT
vs AMBIENT TEMPERATURE
2.464
Vref - REFERENCE INPUT
VOLTAGE (mV)
2.462
2.46
2.458
2.456
2.454
2.452
2.45
0
25
50
75
100
125
AMBIENT TEMPERATURE(℃ )
350
Vref - REFERENCE INPUT
CURRENT (nA)
300
250
200
150
100
50
0
0
25
50
75
100
125
AMBIENT TEMPERATURE(℃ )
CATHODE VOLTAGE vs REFERENCE
INPUT VOLTAGE
Z
KA
- DYNAMIC IMPEDANCE (Ω)
Δ
Vref - REFERENCE INPUT
VOLTAGE (mV)
DYNAMIC IMPEDANCE vs FREQUENCE
100
0
-5
-10
-15
-20
-25
-30
0
5
10
15
20
25
30
35
40
VKA - CATHODE VOLTAGE (V)
10
1
0.1
1
10
100
1000
f - FREQUENCE (KHz)
TL431A3
CYStek Product Specification
CYStech Electronics Corp.
OPEN-LOOP VOLTAGE GAIN
vs FREQUENCY
Spec. No. : C502A3
Issued Date : 2003.03.26
Revised Date : 2005.06.29
Page No. : 4/6
OPEN-LOOP VOLTAGE GAIN
(dB)
40
30
20
10
0
1
10
100
1000
F - FREQUENCY (KHz)
TL431A3
CYStek Product Specification
CYStech Electronics Corp.
TO-92 Taping Outline
H2
H2
H2A H2A
A
D2
Spec. No. : C502A3
Issued Date : 2003.03.26
Revised Date : 2005.06.29
Page No. : 5/6
H3
L
H4 H
L1
H1
F1F2
D1
D
W1
W
T2
T
T1
P1
P
P2
DIM
A
D
D1
D2
F1,F2
F1,F2
H
H1
H2
H2A
H3
H4
L
L1
P
P1
P2
T
T1
T2
W
W1
-
Item
Component body height
Tape Feed Diameter
Lead Diameter
Component Body Diameter
Component Lead Pitch
F1-F2
Height Of Seating Plane
Feed Hole Location
Front To Rear Deflection
Deflection Left Or Right
Component Height
Feed Hole To Bottom Of Component
Lead Length After Component Removal
Lead Wire Enclosure
Feed Hole Pitch
Center Of Seating Plane Location
4 Feed Hole Pitch
Over All Tape Thickness
Total Taped Package Thickness
Carrier Tape Thickness
Tape Width
Adhesive Tape Width
20 pcs Pitch
Millimeters
Min.
4.33
3.80
0.36
4.33
2.40
-
15.50
8.50
-
-
-
-
-
2.50
12.50
5.95
50.30
-
-
0.36
17.50
5.00
253
Max.
4.83
4.20
0.53
4.83
2.90
±0.3
16.50
9.50
1
1
27
21
11
-
12.90
6.75
51.30
0.55
1.42
0.68
19.00
7.00
255
TL431A3
CYStek Product Specification
MicroPython Open Source section
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