TL1431

PRECISION PROGRAMMABLE REFERENCE

SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000

7

POST OFFICE BOX 655303

PARAMETER

TEST CONDITIONS

TEST

TL1431Y

UNIT

PARAMETER

TEST CONDITIONS

CIRCUIT

MIN

TYP

MAX

UNIT

VI(ref)

Reference input voltage

VKA = VI(ref)

Figure 1

2490

2500

2510

mV

DV

I(ref)

Ratio of change in reference input voltage

∆VKA =3Vto36V

Figure 2

11

2

mV/V

I(ref)

DV

KA

gg

to the change in cathode voltage

∆VKA = 3 V to 36 V

Figure 2

–1.1

–2

mV/V

II(ref)

Reference input current

R1 = 10 k

Ω,

R2 =

∞

Figure 2

1.44

2.5

µA

IKAmin

Minimum cathode current for regulation

VKA = VI(ref) to 36 V

Figure 1

0.45

1

mA

Ioff

Off-state cathode current

VKA = 36 V,

Vref = 0

Figure 3

0.18

0.5

µA

|zKA|

Output impedance†

VKA = VI(ref), f ≤ 1 kHz,

IKA = 1 mA to 100 mA

Figure 1

0.2

0.4

Ω

† The output impedance is defined as: |z

′| + DV

DI

When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: z

DV

KA

DI

KA

,

which is approximately equal to z

KA

1

) R1

R2

.

PARAMETER MEASUREMENT INFORMATION

where:

∆TA is the rated operating temperature range of the device.

Max VI(ref)

Min VI(ref)

∆TA

VI(dev)

a

V

I(ref)

ppm

V

I(dev)

V

I(ref)

at 25

DT

A

Input

VKA

IKA

VI(ref)

Input

VKA

IKA

VI(ref)

II(ref)

R1

R2

V

KA +

V

I(ref)

1

) R1

R2

) I

I(ref)

R1