LM431 datasheet(3/9 Pages) HTC

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PROGRAMMABLE PRECISION SHUNT REGULATOR

LM431/A/C

Apr. 2012 – Rev.1.1

- 3 -

HTC

LM431 ELECTRICAL CHARACTERISTICS

(TA=25℃, unless otherwise specified)

CHARACTERISTIC

SYMBOL

TEST CONDITION

MIN.

TYP.

MAX.

UNIT

Reference Voltage

VREF

VKA =VREF, IK =10mA

0.5 %

2.487

2.500

2.512

1 %

2.475

2.500

2.525

Deviation of

Reference Voltage

ΔVREF/ΔT

VKA = VREF, IK =10mA

TA =Full Range

Ratio of Change in

Reference Voltage to the

Change in Cathode Voltage

ΔVREF/ΔVKA

IK =10mA

ΔVKA=10V -VREF

-1.4

-2.7

mV/V

ΔVKA=36V-10V

-1.0

-2.0

Reference Current

IREF

IKA=10mA, R1=10㏀, R2=∞

1.8

4.0

Deviation of Reference

Current

ΔIREF/ΔT

IK =10mA, R1=10㏀, R2=∞

TA =Full Range

0.4

1.2

Minimum Cathode Current

for Regulation

IK(MIN)

VKA= VREF

0.5

Off-State Cathode Current

IK(OFF)

VKA=36V, VREF=0

0.17

0.90

Dynamic Impedance

ZKA

VKA= VREF, IK =1mA~100mA

f ≤ 1kHz

0.27

0.50

Ω

TEST CIRCUITS

[ Fig 1. Test circuit for VKA = VREF ]

[ Fig 2. Test circuit for VKA ≥ VREF ]

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