ZR431G01TC

P1-P3 P4-P6 P7-P7

ADJUSTABLE PRECISION

ZENER SHUNT REGULATOR

ISSUE 4 – SEPTEMBER 2000

ZR431

DEVICE DESCRIPTION

The ZR431 is a three terminal adjustable

shunt regulator offering excellent

temperature stability and output current

handling capability up to 100mA. The output

voltage may be set to any chosen voltage

between 2.5 and 20 volts by selection of two

external divider resistors.

The devices can be used as a replacement

for zener diodes in many applications

requiring an improvement in zener

performance.

FEATURES

Surface mount SO8, SOT223 and

SOT23 packages

TO92 package

2%, 1 % and 0.5% tolerance

Max. temperature coefficient 55 ppm/°C

Temperature compensated for operation

over the full temperature range

Programmable output voltage

50 A to 100mA current sink capability

Low output noise

APPLICATIONS

Shunt regulator

Series regulator

Voltage monitor

Over voltage/ under voltage protection

Switch mode power supplies

V

Z

G

nd

V

ref

SCHEMATIC DIAGRAM

4-189

78

ZR431

ABSOLUTE MAXIMUM RATING

Cathode Voltage (V

Z

) 20V

Cathode Current 150mA

Operating Temperature -40 to 85°C

Storage Temperature -55 to 125°C

Recommended Operating Conditions

Min Max

Cathode Voltage Vref 20V

Cathode Current 50

A 100mA

Power Dissipation (T

amb

=25°C,T

jmax

=150°C)

SOT23 330mW

TO92 780mW

SOT223 2W

SO8 780mW

ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):T

amb

=25°C

PARAMETER

SYMBOL

VALUE

UNITS CONDITIONS

MIN TYP MAX

Reference Voltage 2%

1%

(1)

0.5%

V

ref

2.45

2.475

2.489

2.50

2.50

2.50

2.55

2.525

2.513

VI

L

=10mA (Fig1), V

Z

=V

ref

Deviation of Reference Input

Voltage over Temperature

V

dev

8.0 17 mV I

L

=10mA, V

Z

=V

ref

T

a

=full range (Fig1)

Ratio of the change in

Reference Voltage to the

Change in Cathode

Voltage

V

ref

V

Z

-1.85 -2.7 mV/V V

Z

from V

ref

to 10V

I

Z

=10mA (Fig2)

-1.0 -2.0 mV/V V

Z

from 10V to 20V

I

Z

=10mA (Fig2)

Reference Input Current I

ref

0.12 1.0

A

R1=10k, R2=O/C, l

L

=10mA

(Fig2)

Deviation of Reference

Input Current over

Temperature

I

ref

0.04 0.2

A

R1=10k, R2=O/C, I

L

=10mA

T

a

=full range (Fig2)

Minimum Cathode

Current for Regulation

I

Zmin

35 50

A

V

Z

=V

ref

(Fig1)

Off-state Current I

Zoff

0.1

A

V

Z

=20V, V

ref

=0V (Fig3)

Dynamic Output Impedance R

Z

0.75 V

Z

=V

ref

(Fig1), f=0Hz

(1)

0.5% SOT23 only.

For definitions of reference voltage temperature coefficient and dynamic output impedance see

NOTES following DC TEST CIRCUITS

4-190

78

ZR431

TYPICAL CHARACTERISTICS

Cathode Current v Temperature

Dynamic Impedance v Frequency

Frequency (Hz)

100

10

1.0

0.1

100 1k 10k 100k 1M

Dynamic Impedance ( )

Temperature (°C)

Minimum Cathode Current( A)

24

-40 0 20 40 60-20 80

26

28

30

32

34

36

38

Vref=VZ

Reference Current v Temperature

Temperature (°C)

Reference Voltage (V)

100

-40 0 20 40 60-20 80

110

120

130

140

150

160

2.490

2.492

2.494

2.496

2.498

2.500

2.502

2.504

2.506

Reference Current (nA)

-40 0 20 40 60-20 80

Reference Voltage v Temperature

Temperature (°C)

I

Z

=10mA

Vref=VZ

IZ=10mA

Change in Vr

ef

v Cathode Voltage

Cathode Voltage (V)

0

-25

Change in Reference Output Voltage (mV)

5101520

-20

-15

-10

-5

0

I

Z

=10mA

V

ref

=V

Z

10mA

1mA

SOT223

SO8/TO92

SOT23

4-191

78

P1-P3 P4-P6 P7-P7

ZR431G01TC

Mfr. #:

Manufacturer:

Diodes Incorporated

Description:

Voltage References Programmable

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

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