TL1431 datasheet(3/8 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS

Tamb =25

oC (unless otherwise specified)

Symbol

Parameter

TL1431I

TL1431AI

Unit

Min.

Typ.

Max.

Min.

Typ.

Max.

Vref

Reference Input Voltage - (figure 1)

VKA =Vref,IK = 10mA

Tamb =25

2.490

2.500

2.510

2.493

2.500

2.507

∆Vref

Reference Input Voltage Deviation Over

Temperature Range - (figure 1, note1)

VKA =Vref, IK= 10mA, Tmin.

≤ Tamb ≤ Tmax.

730

∆Vref

∆T

Temperature Coefficient of Reference Input

Voltage - (note 2)

VKA =Vref,IK = 10mA, Tmin.

≤ Tamb ≤ Tmax.

±22

±100

±22

±100

ppm/

∆Vref

∆VKA

Ratio of Change in Reference Input Voltage to

Change in Cathode to Anode Voltage - (figure 2)

IK = 10mA,

∆VKA = 36 to 3V

-1.1

-2

-1.1

-2

mV/V

Iref

Reference Input Current - (figure 2)

IK = 10mA, R1 = 10k

Ω,R2 = ∞

Tamb =25

Tmin.

≤ Tamb ≤ Tmax.

1.5

2.5

1.5

2.5

µA

∆Iref

Reference Input Current Deviation Over

Temperature Range - (figure 2)

IK = 10mA, R1 = 10k

Ω,R2 = ∞

Tmin.

≤ Tamb ≤ Tmax.

0.5

0.8

1.2

µA

Imin

Minimum Cathode Current for Regulation

(figure 1)

VKA =Vref

0.5

0.7

Ioff

Off-State Cathode Current - (figure 3)

180

500

180

500

|ZKA|

Dynamic Impedance - (figure 1, note 3)

VKA =Vref,

∆IK = 1 to 100mA, f ≤ 1kHz

0.2

0.5

0.2

0.5

Ω

Tempera ture

Vre fmax.

Vref min.

Notes : 1.

∆Vref is defined as the difference between the maximum and minimum values obtained over the full temperature

range.

∆Vref =Vref max. -Vref min

The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin

which the reference voltage is guaranteed.

The dynamic Impedance is defined as |ZKA|

∆VKA

∆IK

25 C

Te m pe ra ture

ma x

2.5V

min

-n

p pm

+ n

ppm

/ C

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