LM431 datasheet(4/16 Pages) PHILIPS

4 / 16 page

Philips Semiconductors

Product specification

TL431C, TL431AC, TL431I,

TL431AI, LM431AC

Adjustable precision shunt regulators

1997 Feb 25

DC ELECTRICAL CHARACTERISTICS

°C free-air temperature, unless otherwise stated.

TEST

LIMITS

SYMBOL

PARAMETER

TEST

CKT

TEST CONDITIONS

TL431AC

TL431C/LM431AC

UNIT

CKT

MIN

TYP

MAX

MIN

TYP

MAX

VREF

Reference input voltage

Fig. 3

VKA = VREF, IK = 10mA

2470

2495

2520

2440

2495

2550

VREF(dev)

Deviation of reference input

voltage over full

temperature range3

Fig. 3

VKA = VREF, IK = 10mA,

Tamb = full range2

REF

Ratio of change in reference

input voltage to the change

Fig 4

I = 10mA

∆VKA = 10V – VREF

–1.4

–2.7

–1.4

–2.7

mV/V

REF

in ut voltage to the change

in cathode voltage

Fig. 4

IK = 10mA

∆VKA = 36V – 10V

–1

–2

–1

–2

mV/V

IREF

Reference input current

Fig. 4

IK = 10mA, R1 = 10kΩ, R2 = ∞

µA

IREF(dev)

Deviation of reference input

current over full temperature

range3

Fig. 4

IK = 10mA, R1 = 10kΩ, R2 = ∞,

Tamb = full range2

0.8

1.2

0.4

1.2

µA

IMIN

Minimum cathode current

for regulation

Fig. 3

VKA = VREF

0.4

0.6

0.4

IOFF

Off-state cathode current

Fig. 5

VKA = 36V, VREF = 0

0.1

0.5

0.1

µA

| ZKA |

Dynamic impedance4

Fig. 3

VKA = VREF, IK = 1mA to 100mA,

≤ 1kHz

0.2

0.5

0.2

0.5

Ω

°C free-air temperature, unless otherwise stated.

TEST

LIMITS

SYMBOL

PARAMETER

TEST

CKT

TEST CONDITIONS

TL431AI

TL431I

UNIT

CKT

MIN

TYP

MAX

MIN

TYP

MAX

VREF

Reference input voltage

Fig. 3

VKA = VREF, IK = 10mA

2470

2495

2520

2440

2495

2550

VREF(dev)

Deviation of reference input

voltage over full

temperature range3

Fig. 3

VKA = VREF, IK = 10mA,

Tamb = full range2

REF

Ratio of change in reference

input voltage to the change

Fig 4

I = 10mA

∆VKA = 10V – VREF

–1.4

–2.7

–1.4

–2.7

mV/V

REF

in ut voltage to the change

in cathode voltage

Fig. 4

IK = 10mA

∆VKA = 36V – 10V

–1

–2

–1

–2

mV/V

IREF

Reference input current

Fig. 4

IK = 10mA, R1 = 10kΩ, R2 = ∞

µA

IREF(dev)

Deviation of reference input

current over full temperature

range3

Fig. 4

IK = 10mA, R1 = 10kΩ, R2 = ∞,

Tamb = full range2

0.8

2.5

0.8

2.5

µA

IMIN

Minimum cathode current

for regulation

Fig. 3

VKA = VREF

0.4

0.7

0.4

µA

IOFF

Off-state cathode current

Fig. 5

VKA = 36V, VREF = 0

0.1

0.5

0.1

µA

| ZKA |

Dynamic impedance4

Fig. 3

VKA = VREF, IK = 1mA to 100mA,

≤ 1kHz

0.2

0.5

0.2

0.5

Ω

NOTES:

2. Full temperature range is –40

°C to +85°C for the TL431I and TL431AI, and 0°C to +70°C for the TL431C and TL431AC.

3. The deviation parameters VREF(dev) and IREF(dev) are defined as the differences between the maximum and minimum values obtained over

the rated termperature range. The average full-range temperature coefficient of the reference input voltage,

αVREF, is defined as:

REF |

ppm

deg C

REF(dev)

REF

at 25oC

@ 106

amb

VREF(dev)

Max VREF

Min VREF

∆Tamb

where

∆Tamb is the rated operating free-air temperature range of the device.

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