TL431AM3 datasheet(2/5 Pages) CYSTEKEC

2 / 5 page

CYStech Electronics Corp.

Spec. No. : C502M3

Issued Date : 2003.04.02

Revised Date : 2005.04.20

Page No. : 2/5

TL431M3

CYStek Product Specification

Functional Block Diagram

& Symbol

Test Circuits

Electrical Characteristics ( Ta=25°C unless otherwise specified )

Characteristics

Symbol

Test Conditions

Min

Typ

Max Unit

TL431A

2.445 2.495 2.545

TL431B

2.470 2.495 2.520

Reference Input Voltage

TL431C

VREF

VKA=VREF, IK=10mA

2.480 2.495 2.510

Deviation of Reference Input Voltage

Over-Temperature

VREF(dev)

VKA=VREF, IK=10mA

Tmin

≤Ta≤Tmax

IK=10mA,

∆VKA=10V-VREF

-1.4

-2.7

Ratio of Change in Reference Input

Voltage to the Change in Cathode

Voltage

∆VREF /

∆VKA IK=10mA,

∆KKA=36V-10V

-1.0

-2.0

Reference Input Current

IREF

IK=10mA, R1=10k

Ω,

R2=

∞

µA

Deviation of Reference Input Current

Over Full Temperature Range

IREF(dev)

IK=10mA, R1=10k

Ω,

R2=

∞, Ta=Full Range

0.4

1.2

µA

Minimum Cathode Current for

Regulation

IK(min)

VKA=VREF

0.4

1.0

Off-State Cathode Current

IK(off)

VKA=36V, VREF=0

0.1

1.0

µA

Dynamic impedance

ZKA

VKA=VREF, f

≤1.0KHz

IK=1 to 100mA

0.2

0.5

Ω

Functional Block Diagram :

Symbol :

Cathode

Reference

Anode

Cathode

VREF

Reference

Anode

IREF

VREF

Fig1. Test Circuit for VZ=VREF

IREF

VREF

Fig 2. Test Circuit for VZ>VREF

Note : VZ=VREF(1+R1/R2)+IREFxR1

Fig3. Test Circuit for Off-State

Current

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