∆I

∆V

|z'| =

R2

R1

|z |

KA

(

∆I

KA

∆V

KA

|z | =

KA

where:

α

VI(ref)

ppm

V

I(dev)

V

I(ref)

at 25

× 10

6

T

A

(

(

(

∆V

KA

∆V

I(ref)

(3)

The output impedance is defined as:

, which is approximately equal to

.

TL1431

SLVS062M – DECEMBER 1991 – REVISED APRIL 2012

www.ti.com

Recommended Operating Conditions

MIN

MAX

UNIT

Cathode voltage

36

V

Cathode current

1

100

mA

TL1431C

0

70

Operating free-air temperature

TL1431Q

–40

125

°C

TL1431M

–55

125

Electrical Characteristics

TL1431C

TEST

PARAMETER

TEST CONDITIONS

(1)

UNIT

CIRCUIT

MIN

TYP

MAX

25°C

2490

2500

2510

Reference input voltage

Figure 1

mV

Full range

2480

2520

Deviation of reference input

voltage over full temperature

Full range

Figure 1

4

20

mV

Ratio of change in reference

input voltage to the change in

Full range

Figure 2

–1.1

–2

mV/V

cathode voltage

25°C

1.5

2.5

Reference input current

R1 = 10 k

Ω, R2 = ∞

Figure 2

μA

Full range

3

Deviation of reference input

current over full temperature

R1 = 10 k

Ω, R2 = ∞

Full range

Figure 2

0.2

1.2

μA

Minimum cathode current for

25°C

Figure 1

0.45

1

mA

regulation

25°C

0.18

0.5

Off-state cathode current

Figure 3

μA

Full range

2

25°C

Figure 1

0.2

0.4

Ω

(1)

Full range is 0°C to 70°C for C-suffix devices.

(2)

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

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

4

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