|z |

V

I

,

=

z

KA

1

R1

R2

=

(

)

+

=

V

I(ref)

α

where:

V

I(ref)

ppm

V

I(dev)

V

I(ref)

at 25

T

A

|

|

α

(

V

I(ref)

α

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

is defined as:

(3)

The output impedance is defined as:

, which is approximately equal to

.

TL1431-EP

www.ti.com

SLVS529D – APRIL 2004 – REVISED JANUARY 2015

7.6 Electrical Characteristics

TEST

PARAMETER

TEST CONDITIONS

(1)

MIN

TYP

MAX

UNIT

CIRCUIT

25°C

2490

2500

2510

Reference input voltage

Figure 8

mV

Full range

2470

2530

Deviation of reference input

voltage over full temperature

Full range

Figure 8

17

mV

Ratio of change in reference

input voltage to the change in

Full range

Figure 9

–1.1

–2

mV/V

cathode voltage

25°C

1.5

2.5

Reference input current

R1 = 10 k

Ω,

R2 =

∞

Figure 9

μA

Full range

4

Deviation of reference input

current over full temperature

R1 = 10 k

Ω,

R2 =

∞

Full range

Figure 9

0.5

μA

Minimum cathode current for

25°C

Figure 8

0.45

1

mA

regulation

25°C

0.18

0.5

Off-state cathode current

Figure 10

μA

Full range

2

25°C

Figure 8

0.2

0.4

Ω

(1)

Full range is –40°C to 125°C for Q-suffix devices; –55°C to 125°C for M-suffix devices.

(2)

When the device is operating with two external resistors (see Figure 9), the total dynamic impedance of the circuit is given by:

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