CYStech Electronics Corp.
Adjustable Precision Shunt Regulators
Spec. No. : C502M3
Issued Date : 2003.04.02
Revised Date : 2005.04.20
Page No. : 1/5
TL431XM3
SOT-89
Description
The TL431XM3 series are three-terminal adjustable regulators with guaranteed thermal stability over
applicable temperature range. 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
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
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
TL431M3
CYStek Product Specification
CYStech Electronics Corp.
Functional Block Diagram
Functional Block Diagram :
Cathode
Reference
V
REF
+
-
Anode
Spec. No. : C502M3
Issued Date : 2003.04.02
Revised Date : 2005.04.20
Page No. : 2/5
& 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
TL431M3
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. : C502M3
Issued Date : 2003.04.02
Revised Date : 2005.04.20
Page No. : 3/5
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
Δ
Vref - REFERENCE INPUT
VOLTAGE (mV)
DYNAMIC IMPEDANCE vs FREQUENCE
100
Z
KA
- DYNAMIC IMPEDANCE
(Ω)
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)
TL431M3
CYStek Product Specification
CYStech Electronics Corp.
OPEN-LOOP VOLTAGE GAIN
vs FREQUENCY
Spec. No. : C502M3
Issued Date : 2003.04.02
Revised Date : 2005.04.20
Page No. : 4/5
OPEN-LOOP VOLTAGE GAIN
(dB)
40
30
20
10
0
1
10
100
1000
F - FREQUENCY (KHz)
TL431M3
CYStek Product Specification
CYStech Electronics Corp.
SOT-89 Dimension
Marking:
A
Spec. No. : C502M3
Issued Date : 2003.04.02
Revised Date : 2005.04.20
Page No. : 5/5
1
2
C
3
H
431
431
B
D
E
F
G
I
Style: Pin 1. Reference 2. Anode
3. Cathode
3-Lead SOT-89 Plastic
Surface Mounted Package
CYStek Package Code: M3
*: Typical
DIM
A
B
C
D
E
Inches
Min.
Max.
0.1732 0.1811
0.1594 0.1673
0.0591 0.0663
0.0945 0.1024
0.01417 0.0201
Millimeters
Min.
Max.
4.40
4.60
4.05
4.25
1.50
1.70
2.40
2.60
0.36
0.51
DIM
F
G
H
I
Inches
Min.
Max.
0.0583 0.0598
0.1165 0.1197
0.0551 0.0630
0.0138 0.0161
Millimeters
Min.
Max.
1.48
1.527
2.96
3.04
1.40
1.60
0.35
0.41
Notes:
1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
•
Lead: 42 Alloy ; solder plating
•
Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
•
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
•
CYStek reserves the right to make changes to its products without notice.
•
CYStek
semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
•
CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
TL431M3
CYStek Product Specification
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