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TL432ASA

ADJUSTABLE PRECISION SHUNT REGULATOR

Diodes Incorporated. 

TL431/TL432

ADJUSTABLE PRECISION SHUNT REGULATOR

Electrical Characteristics (TA = +25°C, unless otherwise noted)

Symbol

Parameter

Test Conditions

Min Typ.

VREF Reference voltage

VKA = VREF,

IKA = 10mA

VDEV

Deviation of reference voltage over VKA = VREF,

full temperature range (Note 5)

IKA = 10mA

ΔVREF

ΔVKA

Ratio of the change in reference

voltage to the change in cathode

voltage

IKA = 10mA

TL431A

TL431B

TA = 0 to 70oC

TA = -40 to +85oC

TA = -40 to +125oC

VKA = 10V to VREF

2.470

2.482

VKA = 36V to 10V

2.495

2.495

6

14

14

-1.4

-1

IREF Reference input current

IKA = 10mA, R1 = 10KΩ, R2 = ∞

1

ΔIREF

IREF deviation over full temperature

range (Note 7)

IKA = 10mA,

R1 = 10KΩ,

TA = 0 to 70oC

TA = -40 to +85oC

0.8

0.8

R2 = ∞

TA = -40 to +125oC

0.8

IKA(MIN)

Minimum cathode current for

regulation

VKA = VREF

0.4

IKA(OFF)

|ZKA|

θJA

Off-state current

Dynamic output impedance (Note 8)

Thermal Resistance Junction to

Ambient

VKA = 36V, VREF = 0V

VKA = VREF, f = 0Hz

SOT23

SOT25

SO-8*

0.05

0.2

380

250

70

Notes: 7. Deviation of VDEV, and ΔIREF are defined as the maximum variation of the values over the full temperature range.

Max

2.520

2.507

16

34

34

-2.7

-2

4

1.2

2.5

2.5

0.7

0.5

0.5

Unit

V

mV

mV/V

µA

µA

mA

µA

Ω

oC/W

The average temperature coefficient of the reference input voltage αVREF is defined as:

Vmax

VDEV

X 106

αVREF

=

VREF @ 25ºC

T2 – T1

ppm/ºC

Where:

T2 – T1 = full temperature change.

Vmin

αVREF can be positive or negative depending on whether the slope is

positive or negative.

VDEV = Vmax - Vmin

Notes: 8. The dynamic output impedance, RZ, is defined as:

ZKA

=

ΔVKA

ΔIKA

T1

Temperature

T2

When the device is programmed with two external resistors R1 and R2, the dynamic output

impedance of the overall circuit, is defined as:

ΔV

Z’ = ΔI

≈ ZKA

1 + R1

R2

TL431

*SO-8 is a future package

Document number: DS35044 Rev. 6 - 2

3 of 14

www.diodes.com

April 2012

© Diodes Incorporated

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