Wing Shing TL431LT1, TL431CLP Datasheet

•

Programmable Output Voltage to 36V

•

Low Dynamic Output Impedance 0.2Ω

•

Sink Current Capability of 0.1 mA to 100 mA

•

Equivalent Full-Range Temperature Coefficient of 50 ppm/

o

C

•

Temperature Compensated for Operation over Full Rated

Operating Temperature Range

•

Low Output Noise Voltage

•

Fast Turn on Response

DESCRIPTION

The TL431 is a three-terminal adjustable regulator series with a guaranteed thermal stability over
applicable temperature ranges. The output voltage may be set to any value between Vref
(approximately 2.5 volts) and 36 volts with two external resistors. These devices have a typical
dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn-on
characteristic, making these devices excellent replacement for zener diodes in many applications.

The TL431 is characterized for operation from 0oC to +70oC.

SYMBOL FUNCTIONAL BLOCK DIAGRAM

SCHEMATIC DIAGRAM

Re ference
(R )

Cathod e
(K )

Anode (A)

2.5V

ref

+

-

Re ference
(R )

Cathod e
(K )

Anode
(A )

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SOT————23

ABSOLUTE MAXIMUM RATINGS

(Operating temperature range applies unless otherwise specified)

Characteristic Symbol Value Unit

Cathode Voltage VKA 37 V
Cathode Current Range (Continuous) IK -100 ~ +150 mA
Reference Input Current Range I

REF

0.05 ~ +10 mA

Operating Temperature Range Ta 0 ~ +70

o

C

Storage Temperature Range T

stg

-65 ~ +150

o

C

RECOMMENDED OPERATING CONDITIONS

Characteristic Symbol Test Condition Min Typ Max Unit

Cathode Voltage VKA V

REF

36 V

Cathode Current IK 1.0 100 mA

ELECTRICAL CHARACTERISTICS

(Ta = 25oC, unless otherwise specified)

Characteristic Symbol Test Condition Min Typ Max Unit

Reference Input Voltage V

REF

V

KA = VREF

, IK = 10mA 2.44 2.495 2.55 V

Deviation of Reference
Input Voltage Over­Temperature (Note 1)

V

REF(dev)

VKA = V

REF

, IK = 10mA

T

min

≤ Ta ≤ T

max

4 17 mV

Ratio of Change in
Reference Input Voltage
to the Change in

∆

∆VV

REF

KA

I

K

= 10mA

∆

V

KA

= 10V-V

REF

-1.4 -2.7

mV/V

Cathode Voltage

∆

K

KA

= 36V-10V

-1.0 -2.0

Reference Input Current I

REF

I

K

= 10mA, R1 = 10KΩ, R2 = ∞

2,0 4

µ

A

Deviation of Reference
Input Current Over Full
Temperature Range

I

REF(dev)

IK = 10mA, R1 = 10KΩ, R2 = ∞

Ta = Full Range

0.4 1.2

µ

A

Minimum Cathode
Current for Regulation

I

K(min)

V

KA = VREF

0.4 1.0 mA

Off-State Cathode
Current

I

K(off)

V

KA =

36V, V

REF

= 0 0.1 1.0

µ

A

Dynamic Impedance
(Note2)

ZKA V

KA = VREF

, IK = 10mA to

100mA

f ≤ 1.0KHz

0.2 0.5

Ω