TL431, TL431A, TL431B

TL432, TL432A, TL432B

ADJUSTABLE PRECISION SHUNT REGULATORS

SLVS543H − AUGUST 2004 − REVISED JANUARY 2005

11

POST OFFICE BOX 655303

noted)

PARAMETER

TEST

CIRCUIT

TEST CONDITIONS

TL431C

TL432C

UNIT

PARAMETER

CIRCUIT

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Vref

Reference voltage

2

VKA = Vref,

IKA = 10 mA

2440

2495

2550

mV

VI(dev)

Deviation of reference voltage

over full temperature range

2

VKA = Vref,

IKA = 10 mA,

SOT23-3 and TL432

devices

6

16

mV

VI(dev)

over full temperature range

(see Figure 1)

2

IKA = 10 mA,

TA = 0°C to 70°C

All other devices

4

25

mV

DV

ref

Ratio of change in reference voltage

3

IKA = 10 mA

∆VKA = 10 V − Vref

−1.4

−2.7

mV

DV

ref

DV

KA

Ratio of change in reference voltage

to the change in cathode voltage

3

IKA = 10 mA

∆VKA = 36 V − 10 V

−1

−2

mV

V

Iref

Reference current

3

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞

2

4

µA

II(dev)

Deviation of reference current

over full temperature range

(see Figure 1)

3

IKA = 10 mA, R1 = 10 kΩ, R2 = ∞,

TA = 0°C to 70°C

0.4

1.2

µA

Imin

Minimum cathode current

for regulation

2

VKA = Vref

0.4

1

mA

Ioff

Off-state cathode current

4

VKA = 36 V,

Vref = 0

0.1

1

µA

|zKA|

Dynamic impedance (see Figure 1)

1

IKA = 1 mA to 100 mA, VKA = Vref,

f

≤ 1 kHz

0.2

0.5

Ω

values obtained over the recommended temperature range. The average full-range temperature coefficient of the

reference voltage,

where:

lower temperature.

Calculating Dynamic Impedance

The dynamic impedance is defined as:

When the device is operating with two external resistors (see Figure 3), the total dynamic impedance of the circuit

is given by:

Maximum Vref

Minimum Vref

∆TA

VI(dev)

a

V

ref

ppm

°C +

V

I(dev)

V

ref

at 25

°C

DT

A

a

V

ref

+

4mV

2495 mV

70

°C

[

23 ppm

°C

|z

+

DV

KA

DI

KA

|z |

+ DV

DI [

|z

1

) R1

R2

ref

Figure 1. Calculating Deviation Parameters and Dynamic Impedance