TL1431MFKB datasheet(4/27 Pages) TI1

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where:

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

Max VI(ref)

Min VI(ref)

˙TA

VI(dev)

VI(ref)

ppm

°C

I(dev)

I(ref)

at 25

°C

× 10

(

( =

(

∆I

∆V

|z | =

∆I

∆V

|z'| =

|z |

(1 +

(

∆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

VKA

Cathode voltage

VI(ref)

IKA

Cathode current

100

TL1431C

Operating free-air temperature

TL1431Q

–40

125

°C

TL1431M

–55

125

Electrical Characteristics

at specified free-air temperature, IKA = 10 mA (unless otherwise noted)

TL1431C

TEST

PARAMETER

TEST CONDITIONS

(1)

UNIT

CIRCUIT

MIN

TYP

MAX

25°C

2490

2500

2510

VI(ref)

Reference input voltage

VKA = VI(ref)

Figure 4

Full range

2480

2520

Deviation of reference input

VI(dev)

voltage over full temperature

VKA = VI(ref)

Full range

Figure 4

range(2)

Ratio of change in reference

input voltage to the change in

ΔVKA = 3 V to 36 V

Full range

Figure 5

–1.1

–2

mV/V

cathode voltage

25°C

1.5

2.5

II(ref)

Reference input current

R1 = 10 k

Ω, R2 = ∞

Figure 5

μA

Full range

Deviation of reference input

II(dev)

current over full temperature

R1 = 10 k

Ω, R2 = ∞

Full range

Figure 5

0.2

1.2

μA

range(2)

Minimum cathode current for

Imin

VKA = VI(ref)

25°C

Figure 4

0.45

regulation

25°C

0.18

0.5

Ioff

Off-state cathode current

VKA = 36 V, VI(ref) = 0

Figure 6

μA

Full range

VKA = VI(ref), f ≤ 1 kHz,

|zKA|

Output impedance(3)

25°C

Figure 4

0.2

0.4

Ω

IKA = 1 mA to 100 mA

(1)

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

(2)

The deviation parameters VI(dev) and II(dev) are defined as the differences between the maximum and minimum values obtained over the

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

αVI(ref) is defined as:

αVI(ref) is positive or negative, depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature.

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

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