tl431

TL431

PROGRAMMABLEVOLTAGEREFERENCE

....

ADJUSTABLEOUTPUTVOLTAGE:2.5to36V

SINKCURRENTCAPABILITY:1to100mATYPICALOUTPUTIMPEDANCE:0.22Ω1%AND2%VOLTAGEPRECISION

ZTO92

(PlasticPackage)

NDIP8

(PlasticPackage)

DESCRIPTION

TheTL431isaprogrammableshuntvoltagerefer-encewithguaranteedtemperaturestabilityovertheentiretemperaturerangeofoperation.

Theoutputvoltagemaybesettoanyvaluebe-tweenVref(approximately2.5V)and36Vwithtwoexternalresistors.

TheTL431operateswithawidecurrentrangefrom1to100mAwithatypicaldynamicimpedanceof0.22Ω.

PINCONNECTIONS

TO92(Topview)

8

DSO8

(BatwingPlasticMicropackage)

ORDERCODES

PartnumberTemperatureRangeTL431C/ACTL431I/AI

0oC,+70oC-40oC,+105oC

PackageZ••

N••

D••

DIP8(Topview)

7

6

5

8

SO8(Topview)

7

6

5

CathodeAnodeReference

1

2

3

12345678

1

2

3

4

-Cathode-N.C.-N.C.-N.C.-N.C.-Anode-N.C.

-Reference

1

2

3

4

12345678-Cathode-Anode-Anode-N.C.-N.C.-Anode-Anode-Reference

November19981/9

TL431

ABSOLUTEMAXIMUMRATINGS

SymbolVKAIKIrefToperTstg

Parameter

CathodetoAnodeVoltage

ContinuousCathodeCurrentRangeReferenceInputCurrentRange

OperatingFree-airTemperatureRangeTL431C/AC

TL431I/AIStorageTemperatureRange

Value37-100to+150-0.05to+100to+70-40to+105-65to+150

UnitVmAmA

oo

CC

OPERATINGCONDITIONS

SymbolVKAIK

CathodeCurrent

Parameter

CathodetoAnodeVoltage

ValueVrefto361to100

UnitVmA

ELECTRICALCHARACTERISTICS

Tamb=25oC(unlessotherwisespecified)

SymbolVref∆Vref∆Vref∆VKAIref

Parameter

TL431CMin.

Typ.

Max.

Min.2.472.453

TL431ACTyp.2.495

Max.2.522.537

UnitV

ReferenceInputVoltage-(figure1)

o

Tamb=25C2.442.4952.55VKA=Vref,IK=10mA

Tmin.≤Tamb≤Tmax.2.4232.567ReferenceInputVoltageDeviationOver

TemperatureRange-(figure1,note1)

VKA=Vref,IK=10mA,Tmin.≤Tamb≤Tmax.RatioofChangeinReferenceInputVoltagetoChangeinCathodetoAnodeVoltage-(figure2)

∆VKA=10VtoVrefIK=10mA

∆VKA=36Vto10VReferenceInputCurrent-(figure2)

IK=10mA,R1=10kΩ,R2=∞

Tamb=25oC

Tmin.≤Tamb≤Tmax.ReferenceInputCurrentDeviationOverTemperatureRange-(figure2)

IK=10mA,R1=10kΩ,R2=∞

Tmin.≤Tamb≤Tmax.

MinimumCathodeCurrentforRegulation-(figure1)

VKA=VrefOff-StateCathodeCurrent-(figure3)DynamicImpedance-(figure1,note2)

VKA=Vref,∆IK=1to100mA,f≤1kHz

3-1.4-11.8

17-2.7-245.21.2

mV

3-1.4-11.8

15

mV/V

-2.7-2

µA

45.2

µA

0.4

0.4

1.2

mAnAΩ

∆Iref

IminIoff|ZKA|

Notes:1.

0.52.60.22

110000.5

0.52.60.22

0.610000.5

∆Vrefisdefinedasthedifferencebetweenthemaximumandminimumvaluesobtainedoverthefulltemperaturerange.

∆Vref=Vrefmax.-Vrefmin

Vrefmax.

Vrefmin.

T1

T2

Temperature

2.ThedynamicImpedanceisdefinedas|ZKA|=

∆VKA∆IK

2/9

TL431

ELECTRICALCHARACTERISTICS

Tamb=25oC(unlessotherwisespecified)

SymbolVref∆Vref∆Vref∆VKAIref

Parameter

ReferenceInputVoltage-(figure1)

o

Tamb=25CVKA=Vref,IK=10mA

Tmin.≤Tamb≤Tmax.ReferenceInputVoltageDeviationOverTemperatureRange-(figure1,note1)

VKA=Vref,IK=10mA,Tmin.≤Tamb≤Tmax.RatioofChangeinReferenceInputVoltagetoChangeinCathodetoAnodeVoltage-(figure2)

∆VKA=10VtoVrefIK=10mA

∆VKA=36Vto10VReferenceInputCurrent-(figure2)

IK=10mA,R1=10kΩ,R2=∞

Tamb=25oC

Tmin.≤Tamb≤Tmax.ReferenceInputCurrentDeviationOverTemperatureRange-(figure2)

IK=10mA,R1=10kΩ,R2=∞

Tmin.≤Tamb≤Tmax.

MinimumCathodeCurrentforRegulation-(figure1)

VKA=VrefOff-StateCathodeCurrent-(figure3)DynamicImpedance-(figure1,note2)

VKA=Vref,∆IK=1to100mA,f≤1kHz

TL431IMin.2.442.41

Typ.2.495

Max.2.552.58

Min.2.472.44

TL431AITyp.2.495

Max.2.522.55

UnitV

mV

7-1.4-11.8

30-2.7-246.52.5

7-1.4-11.8

30

mV/V

-2.7-2

µA

46.5

µA

0.8

0.8

1.2

mAnAΩ

∆Iref

IminIoff|ZKA|

Notes:1.

0.52.60.22

110000.5

0.52.60.22

0.710000.5

∆Vrefisdefinedasthedifferencebetweenthemaximumandminimumvaluesobtainedoverthefulltemperaturerange.

∆Vref=Vrefmax.-Vrefmin

Vrefmax.

Vrefmin.

T1

T2

Temperature

2.ThedynamicImpedanceisdefinedas|ZKA|=

∆VKA∆IK

3/9

TL431

ReferencevoltagevsTemperature2,58

Average

2,56

2%range

2,54Referencevoltage(V)1%range

2,522,52,482,462,442,42

-40-30-20-10

0

10

20304050Temperature(°C)

60

70

80

90

100

TestcircuitforVka=VrefInput

Ik=10mA

Vka=VrefIk=10mA

Output

Vka

Vref

CathodecurrentvsCathodevoltage100908070IkaCathodecurrent(mA)6050403020100-10-20-30-40-50

-2

-1

01VkaCathodevoltage(V)

2

3

-2-1-1,521,510,50-0,5-1

CathodecurrentvsCathodevoltageVka=VrefTa=25°C

Vka=VrefTa=25°C

IkaCathodeCurrent(mA)0

1

VkaCathodevoltage(V)

23

Referenceinputcurrentvstemperature1,2

Rka(Ohms)0,24

1,1IrefReferenceinputcurrent(µA)Rka-StaticimpedancevsTemperatureIka=10mAR1=10KR2=inf

0,235

Vka=VrefIka=1to100mA

1

0,23

0,9

0,225

0,8

0,7

0,22

0,6-40

-30-20-10010

20304050Temperature(°C)

60708090100

0,215

-40

-30-20-10010

20304050Temperature(°C)

60708090100

4/9

TL431

OffStatecathodecurrentvstemperature1,41,210,80,60,40,20-40

TestcircuitforOff-statecurrentmeasurementInput

Ioff

Vka=36V

IoffOffStatecathodecurrent(µA)Vka=36VVref=0V

-30-20-10010

20304050Temperature(°C)

60708090100

Phase&GainvsFrequency

Gain(dB)60

Phase(°)

180160140

40

Gain

30

Phase

120100

10µF

6.8K

TestcircuitforPhase&Gainmeasurements50

10µF

Output

Ik=10mA

20

8060

Input

4.3K

10

Vref

40201,000

0

12510

2050Frequency(KHz)

100200500

PulseresponseforIk=1mA6

5Input&Outputvoltage(V)Input

Vka=VrefIk=1mATa=25°C

TestcircuitforpulseresponseatIk=1mA2.5KΩ

4

3Output

Ik=1mA

1

0

-1

01234

5Time(µs)

6710

OutputIntput2

PulseGenerator

50Ω

5/9

TL431

PulseresponseforIk=10mA6

TestcircuitforpulseresponseatIk=10mAInput

Vka=VrefIk=10mATa=25°C

250Ω

5Input&Outputvoltage(V)43210-1

Output

Ik=10mA

01234

5

Time(µs)

6710

StabilityconditionsvsCapacitiveloads1101009080Cathodecurrent(µA)706050403020100

1E-10

1E-9

1E-81E-7Capacitiveload(F)

0,000001

0,00001

TestcircuitforVka>VrefVka=Vref

Stablearea

Vka=5V

Unstablearea

Stablearea

Input

Ik

R1

Iref

R2

Vka

Vka=12VVka=24V

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

Vref

6/9

OutputIntputPulseGenerator

50Ω

TL431

PACKAGEMECHANICALDATA8PINS-PLASTICDIP

Dim.Aa1Bbb1DEee3e4FiLZ

Millimeters

Min.0.511.150.3560.2047.95

2.547.627.62

6.65.08

3.18

3.811.52

0.125

1.650.550.30410.929.75

0.313

Typ.3.32

0.0200.0450.0140.008

Max.

Min.

InchesTyp.0.131

0.0650.0220.0120.4300.384

0.1000.3000.300

02600.2000.1500.060Max.

7/9

TL431

PACKAGEMECHANICALDATA

8PINS-BATWINGPLASTICMICROPACKAGE(SO)

Dimensions

Aa1a2a3bb1Cc1DEee3FLMS

Min.0.10.650.350.190.254.85.8

Millimeters

Typ.

Max.1.750.251.650.850.480.250.5

45(typ.)5.06.2

o

Min.0.0040.0260.0140.0070.0100.10.228

InchesTyp.

Max.0.0690.0100.0650.0330.0190.0100.0200.1970.244

1.273.81

3.80.4

4.01.270.6

8o(max.)

0.1500.016

0.0500.150

0.1570.0500.024

8/9

TL431

PACKAGEMECHANICALDATA3PINS-PLASTICPACKAGETO92

Dimensions

LBO1CKO2a

Min.3.24.454.5812.70.4070.35

Millimeters

Typ.1.273.75.005.03

0.5

Max.4.25.25.330.508

Min.0.1260.17520.18030.50.0160.0138

InchesTyp.0.050.14570.19690.1980.0197

Max.0.16540.20470.20980.02

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9/9

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