TL431C datasheet(3/10 Pages) STMICROELECTRONICS

3 / 10 page

TL431

3/10

ELECTRICAL CHARACTERISTICS

amb = 25°C (unless otherwise specified)

1) ∆V

ref is defined as the difference between the maximum and minimum values obtained over the full temperature range.

∆V

ref = Vref max. - Vref min.

2) The dynamic Impedance is definied as

ZKA =

Symbol

Parameter

TL431I

TL431AI

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

Vref

Reference Input Voltage

VKA = Vref , Ik = 10 mA

Tamb = 25°C

Tmin ≤Tamb ≤ Tmax

2.44

2.41

2.495

2.55

2.58

2.47

2.44

2.495

2.52

2.55

∆V

ref

Reference Input Voltage Deviation Over-

Temperature Range - note 1

VKA = Vref , Ik =10 mA,Tmin≤Tamb≤ Tmax

Ratio of Change in Reference Input

Voltage to Change in Cathode to Anode

Voltage

Ik = 10mA

∆V

KA = 10V to Vref

∆V

KA = 36V to 10V

-1.4

-1

-2.7

-2

-1.4

-1

-2.7

-2

mV/V

Iref

Reference Input Current

Ik = 10mA, R1 = 10k

Ω, R2 = ∞

Tamb = 25°C

Tmin ≤Tamb ≤Tmax

1.8

6.5

1.8

6.5

µA

∆Iref

Reference Input Current Deviation

Over Temperature Range

Ik = 10mA, R1 = 10k

Ω, R2 =∞

Tmin ≤Tamb ≤ Tmax

0.8

2.5

0.8

1.2

µA

Imin

Minimum Cathode Current for Regulation

VKA = Vref

0.5

0.7

Ioff

Off-State Cathode Current

2.6

1000

2.6

1000

ZKA

Dynamic Impedance note 2

VKA = Vref ,∆ Ik = 1 to100mA, f ≤1kHZ

0.22

0.5

0.22

0.5

Ω

∆Vref

∆Vka

------------

Temperature

V ref max.

V ref min.

∆VKA

∆IK

-----------------

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