TL431 datasheet(12/79 Pages) TI

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∆I

∆V

|z | =

∆I

∆V

|z'| =

|z |

(1 +

(

(2)

The dynamic impedance is defined as:

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

which is approximately equal to

TL431, TL431A, TL431B

TL432, TL432A, TL432B

SLVS543L

– AUGUST 2004 – REVISED FEBRUARY 2011

www.ti.com

ELECTRICAL CHARACTERISTICS

over recommended operating conditions, TA = 25°C (unless otherwise noted)

TL431I, TL432I

PARAMETER

TEST CIRCUIT

TEST CONDITIONS

UNIT

MIN

TYP

MAX

Vref

Reference voltage

Figure 1

VKA = Vref, IKA = 10 mA

2440

2495

2550

SOT23-3 and TL432

Deviation of reference input

VKA = Vref,

devices

VI(dev)

voltage over full temperature

Figure 1

IKA = 10 mA

range(1)

All other devices

Ratio of change in reference

ΔVKA = 10 V − Vref

-1.4

-2.7

ΔVref /

voltage to the change in

Figure 2

IKA = 10 mA

mV/V

ΔVKA

ΔVKA = 36 V − 10 V

-1

-2

cathode voltage

Iref

Reference input current

Figure 2

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞

µA

Deviation of reference input

II(dev)

current over full temperature

Figure 2

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞

0.8

2.5

µA

range(1)

Minimum cathode current for

Imin

Figure 1

VKA = Vref

0.4

regulation

Ioff

Off-state cathode current

Figure 3

VKA = 36 V, Vref = 0

0.1

µA

|zKA|

Dynamic impedance(2)

Figure 1

VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA

0.2

0.5

Ω

(1)

The deviation parameters Vref(dev) and Iref(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

αVref is defined as:

αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature.

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Product Folder Link(s): TL431 TL431A TL431B TL432 TL432A TL432B

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