TL431A datasheet(2/7 Pages) WINGS

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RECOMMENDED OPERATING CONDITIONS

Characteristic

Symbol

Test Condition

Min

Typ

Max

Unit

Cathode Voltage

VKA

REF

Cathode Current

0.5

100

ELECTRICAL CHARACTERISTICS

(Ta = 25

oC, V

KA = VREF, IK = 10mA unless otherwise specified)

Characteristic

Symbol

Test Condition

Min

Typ

Max

Unit

Reference Input Voltage

VREF

2.445

2.495

2.545

Deviation of Reference Input

Voltage Over Full Temperature

Range

VREF(dev)

Tmin

≤ Ta ≤ Tmax

Ratio of Change in Reference Input

Voltage to the Change in Cathode

Voltage

∆

REF

∆VKA = 10V-VREF

∆VKA = 36V- 10V

-1.4

-1.0

-2.7

-2.0

mV/V

Reference Input Current

IREF

R1 = 10K

Ω, R2 = ∞

1.8

µA

Deviation of Reference Input

Current Over Full Temperature

Range

IREF(dev)

R1 = 10K

Ω, R2 = ∞

0.4

1.2

µA

Minimum Cathode Current for

Regulation

IK(min)

0.25

0.5

Off-State Cathode Current

IK(off)

VKA = 40V, VREF = 0

0.26

0.9

µA

Dynamic Impedance

ZKA

IK = 10mA to 100 mA , f

≤ 1.0KHz

0.22

0.5

Ω

TEST CIRCUITS

Fig.1. Test Circuit for VKA = VREF

Fig.2. Test Circuit for VKA

≥≥≥≥ VREF

Fig.3. Test Circuit for Ioff

IN P U T

V RE F

BT 432

V KA

10n F

IN P U T

V RE F

IRE F

B T 432

V KA

IRE F

V RE F

(1+ R 1/R 2)+

10n F

IK(O FF )

BT 432

IN P U T

V KA

TL431A

Adjustable Precision Shunt Regulator

Vka=Vref, Ik=10mA

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