Datasheet TL431IN, TL431ID, TL431CZ, TL431IZ, TL431AIZ Datasheet (SGS Thomson Microelectronics)



PROGRAMMABLE VOLTAGE REFERENCE

.

ADJUSTABLE OUTPUTVOLTAGE :

2.5 to 36V

.

SINK CURRENTCAPABILITY :1 to 100mA

.

TYPICALOUTPUT IMPEDANCE: 0.22Ω

.

1%AND 2% VOLTAGEPRECISION

TL431

Z

TO92

(Plastic Package)

N

DIP8

(Plastic Package)

DESCRIPTION

The TL431is a programmableshuntvoltagerefer­ence with guaranteed temperature stability over
the entire temperature range of operation.
The output voltage may be set to any value be­tween V
externalresistors.
The TL431operateswithawide currentrangefrom
1 to 100mA with a typical dynamic impedance of

0.22Ω.

PIN CONNECTIONS

Cathode Anode Reference

(approximately2.5V) and 36Vwith two

ref

TO92

(Topview)

123

DIP8

(Top view)

8765

1234

(Batwing Plastic Micropackage)

ORDER CODES

Part number Temperature Range

o

TL431C/AC 0
TL431I/AI -40

1 - Cathode
2 - N.C.
3 - N.C.
4 - N.C.
5 - N.C.
6 -Anode
7 - N.C.
8 - Reference

C, +70oC •••

o

C, +105oC •••

SO8

(Top view)

8765

1234

D

SO8

Package

ZND

1 - Cathode
2 -Anode
3 -Anode
4 - N.C.
5 - N.C.
6 -Anode
7 -Anode
8 - Reference

November 1998

1/9

TL431

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

KA

I

K

I

ref

T

oper

T

stg

OPERATING CONDITIONS

Symbol Parameter Value Unit

V

KA

I

K

ELECTRICALCHARACTERISTICS

=25oC (unless otherwisespecified)

T

amb

Symbol Parameter

V

ref

∆V

ref

∆V

ref

∆V

KA

Iref Reference InputCurrent - (figure 2)

∆I

ref

I

min

I

off

| Dynamic Impedance - (figure 1, note 2)

|Z

KA

Cathode to Anode Voltage 37 V
Continuous Cathode Current Range -100 to +150 mA
Reference Input Current Range -0.05 to +10 mA
Operating Free-air Temperature Range TL431C/AC

TL431I/AI

0 to +70

-40 to +105

Storage Temperature Range -65 to +150

Cathode to Anode Voltage V

to 36 V

ref

Cathode Current 1 to 100 mA

TL431C TL431AC

Min. Typ. Max. Min. Typ. Max.

Reference InputVoltage - (figure1)

V

KA=Vref,IK

= 10mA T

≤ T

T

min.

amb

≤ T

max.

amb

=25oC

2.44

2.423

2.495 2.55

2.567

2.47

2.453

2.495 2.52

2.537

Reference InputVoltage Deviation Over
Temperature Range - (figure 1, note1)

V

KA=Vref,IK=

10mA,T

min.

≤ T

amb

≤ T

max.

317 315

Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)

=10mA ∆VKA= 10V to V

I

K

= 10mA, R1=10kΩ,R2=∞

I

K

∆VKA= 36V to 10V

=25oC

T

amb

≤ T

T

min.

amb

≤ T

ref

max.

-1.4-1-2.7

-2

1.8 4

5.2

-1.4-1-2.7

-2

1.8 4

5.2

Reference InputCurrent Deviation Over
Temperature Range - (figure 2)

= 10mA, R1=10kΩ,R2=∞

I

K

T

min.

≤ T

amb

≤ T

max.

0.4 1.2 0.4 1.2

Minimum Cathode Current for Regulation - (figure 1)

V

KA=Vref

0.5 1 0.5 0.6

Off-State CathodeCurrent - (figure 3) 2.6 1000 2.6 1000 nA

V

KA=Vref

, ∆IK= 1 to 100mA, f ≤ 1kHz 0.22 0.5 0.22 0.5

o

C

o

C

mV/V

Unit

V

mV

µA

µA

mA

Ω

Notes : 1. ∆V

2. The dynamic Impedance is defined as |ZKA| =

isdefined as the difference between the maximum and minimum values obtained over the full temperature

ref

range.
∆V

ref=Vrefmax.-Vrefmin

2/9

V

V

ref ma x.

re fmin.

T1

∆V

∆I

T2

KA
K

Temp era ture

ELECTRICALCHARACTERISTICS

=25oC (unless otherwisespecified)

T

amb

Symbol Parameter

V

∆V

∆V

∆V

Iref Reference InputCurrent - (figure 2)

∆I

I

|Z

Reference InputVoltage - (figure1)

ref

ref

ref

KA

ref

min

I

off

| Dynamic Impedance - (figure 1, note 2)

KA

V

KA=Vref,IK

Reference InputVoltage Deviation Over
Temperature Range - (figure 1, note1)

V

KA=Vref,IK=

Ratio of Change in Reference Input Voltage to
Change in Cathode to Anode Voltage - (figure 2)

=10mA ∆VKA= 10V to V

I

K

= 10mA, R1=10kΩ,R2=∞

I

K

Reference InputCurrent Deviation Over
Temperature Range - (figure 2)

= 10mA, R1=10kΩ,R2=∞

I

K

Minimum Cathode Current for Regulation - (figure 1)

V

KA=Vref

Off-State CathodeCurrent - (figure 3) 2.6 1000 2.6 1000 nA

V

KA=Vref

= 10mA T

≤ T

T

min.

10mA,T

min.

∆VKA= 36V to 10V

=25oC

T

amb

≤ T

T

min.

≤ T

T

min.

, ∆IK= 1 to 100mA, f ≤ 1kHz 0.22 0.5 0.22 0.5

amb

≤ T

amb

amb

≤ T

amb

≤ T

≤ T

max.

≤ T

max.

max.

TL431

TL431I TL431AI

Min. Typ. Max. Min. Typ. Max.

=25oC

amb

max.

ref

2.44

2.41

2.495 2.55

2.58

2.47

2.44

2.495 2.52

730 730

-1.4-1-2.7

-1.4-1-2.7

-2

1.8 4

1.8 4

6.5

0.8 2.5 0.8 1.2

0.5 1 0.5 0.7

Unit

V

2.55
mV

mV/V

-2
µA

6.5
µA

mA

Ω

Notes : 1. ∆V

2. The dynamic Impedance is defined as |ZKA| =

isdefined as the difference between the maximum and minimum values obtained over the full temperature

ref

range.
∆V

=V

refmax.-Vrefmin

ref

V

ref ma x.

V

re fmin.

T1 T2

∆V

Temp era ture

KA

∆I

K

3/9

TL431

2,58

2,56

2,54

2,52

2,5

2,48

Referencevoltage (V)

2,46

2,44

2,42

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100

Temperature(°C)

Cathode current vs Cathode voltage

100

90

Reference voltagevs Temperature

80
70
60
50
40
30
20
10

0

Ika Cathodecurrent(mA)

-10

-20

-30

-40

-50

-2 -1 0 1 2 3

Vka=Vref
Ta=25°C

VkaCathodevoltage (V)

Average

2%range

1%range

Vka=Vref
Ik=10mA

Test circuit for Vka=Vref

Input

Ik=10mA

Vref

Cathode current vs Cathode voltage

2

1,5

1

0,5

0

-0,5

Ika CathodeCurrent (mA)

-1

-1,5

-2

-10123
VkaCathodevoltage(V)

Vka=Vref
Ta=25°C

Output

Vka

Reference inputcurrent vs temperature

1,2

1,1

1

0,9

0,8

Iref Referenceinputcurrent(µA)

0,7

0,6

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100

Temperature(°C)

Ika=10mA

R1=10K

R2=inf

4/9

Rka (Ohms)

0,24

0,235

0,23

0,225

0,22

0,215

Rka - Static impedance vs Temperature

Vka=Vref

Ika =1 to 100mA

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100

Temperature(°C)

TL431

Off State cathode currentvs temperature

1,4

1,2

1

0,8

0,6

0,4

Ioff OffStatecathode current(µA)

0,2

0

-40-30-20-10 0 102030405060708090100

Gain(dB) Phase(°)
60

50

40

30

20

10

0

1 2 5 10 20 50 100 200 500 1,000

Vka=36V

Vref=0V

Temperature(°C)

Phase & Gain vs Frequency

Frequency(KHz)

Gain

Phase

Test circuit for Off-state current measurement

Input Vka=36V

Ioff

180

160

140

120

100

80

60

40

20

Test circuit for Phase & Gain measurements

10µF

Ik=10mA

Input

10µF

6.8K

4.3K

Vref

Output

6

Pulse response for Ik=1mA

5

4

3

2

1

Input& Output voltage(V)

0

-1
012345678910

Input

Output

Time(µs)

Vka=Vref
Ik=1mA
Ta=25°C

Test circuit for pulse response at Ik=1mA

ΩΩ

2.5K

Ik=1mA

Pulse

Generator

Intput

50ΩΩ

Output

5/9

TL431

6

5

4

3

2

1

Input & Output voltage(V)

0

-1
012345678910

Input

Output

Time (µs)

Vka=Vref
Ik=10mA
Ta=25°C

Stabilityconditionsvs Capacitive loads

110

Pulse responsefor Ik=10mA

100

90
80

Stable

70

area

60
50
40

Cathodecurrent(µA)

30
20
10

0
1E-10 1E-9 1E-8 1E-7 0,000001 0,00001

Vka=Vref

Vka=5V

Vka=12V

Vka=24V

Capacitiveload(F)

Unstable

area

Stable

area

Test circuit for pulse response at Ik=10mA

250ΩΩ

Ik=10mA

Pulse

Generator

Intput

50ΩΩ

Testcircuit for Vka > Vref

Input

R1

R2

Ik

Iref

Vref

Vka

Vka =Vref . (1+R1/R2) + Iref . R1

Output

6/9

PACKAGE MECHANICAL DATA

8 PINS - PLASTIC DIP

TL431

Dim.

A 3.32 0.131

a1 0.51 0.020

B 1.15 1.65 0.045 0.065

b 0.356 0.55 0.014 0.022

b1 0.204 0.304 0.008 0.012

D 10.92 0.430
E 7.95 9.75 0.313 0.384

e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300

F 6.6 0260

i 5.08 0.200

L 3.18 3.81 0.125 0.150

Z 1.52 0.060

Min. Typ. Max. Min. Typ. Max.

Millimeters Inches

7/9

TL431

PACKAGE MECHANICAL DATA

8 PINS - BATWING PLASTIC MICROPACKAGE(SO)

Dimensions

A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033

b 0.35 0.48 0.014 0.019

b1 0.19 0.25 0.007 0.010

C 0.25 0.5 0.010 0.020
c1 45

D 4.8 5.0 0.189 0.197

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 3.81 0.150

F 3.8 4.0 0.150 0.157

L 0.4 1.27 0.016 0.050

M 0.6 0.024

S8

Min. Typ. Max. Min. Typ. Max.

Millimeters Inches

o

(typ.)

o

(max.)

8/9

PACKAGE MECHANICAL DATA

3 PINS - PLASTIC PACKAGETO92

TL431

Dimensions

Min. Typ. Max. Min. Typ. Max.

Millimeters Inches

L 1.27 0.05

B 3.2 3.7 4.2 0.126 0.1457 0.1654

O1 4.45 5.00 5.2 0.1752 0.1969 0.2047

C 4.58 5.03 5.33 0.1803 0.198 0.2098

K 12.7 0.5

O2 0.407 0.5 0.508 0.016 0.0197 0.02

a 0.35 0.0138

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