Electrical characteristics

TL431, TL432

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DocID4467 Rev 17

Table 4. TL431B, TL432B (Tamb = 25 °C unless otherwise specified)

Symbol

Parameter

TL431B, TL432B

Unit

Min.

Typ.

Max.

Vref

Reference input voltage

VKA = Vref, Ik = 10 mA, Tamb = 25 °C

Tmin ≤ Tamb ≤ Tmax

2.483

2.453

2.495

-

2.507

2.537

V

∆V

ref

Reference input voltage deviation overtemperature range (1)

VKA = Vref, Ik = 10 mA, Tmin ≤ Tamb ≤ Tmax

-

7

30

mV

Ratio of change in reference input voltage to change in cathode to

anode voltage

Ik = 10 mA - ∆VKA = 10 V to Vref

∆V

KA = 36 V to 10 V

-2.7

-2

-1.4

-1

-

-

mV/V

Iref

Reference input current

Ik = 10 mA, R1 = 10 kΩ, R2 = ∞

Tamb = 25 °C

Tmin ≤ Tamb ≤ Tmax

-

-

1.8

-

4

6.5

µA

∆I

ref

Reference input current deviation overtemperature range

Ik = 10 mA, R1 = 10 kΩ, R2 =∞

Tmin ≤ Tamb ≤ Tmax

-

0.8

2.5

µA

Imin

Minimum cathode current for regulation

VKA = Vref

-

0.45

0.6

mA

Ioff

Off-state cathode current

-

180

500

nA

ZKA

Dynamic impedance(2)

VKA = Vref, ∆ Ik = 1 to 100 mA, f ≤ 1 kHZ

-

0.22

0.5

Ω

1. See definition of Section : Reference input voltage deviation overtemperature range.

2. The dynamic impedance is defined as

|ZKA| =

∆Vref

∆Vka

------------

∆V

KA

I

k

∆

----------------