ZR431F01 - DIODES Incorporated

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 1 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Description

The ZR431 is a three terminal adjustable shunt regulator

offering excellent temperature stability and output current

handling capa bility up to 100mA. The outp ut 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 diode s

in many applications requiring an improvement in zener

performance.

Features

• Surface mount SOT223 and SOT23 packages

• 2%, 1 % and 0.5% tolerance

• Max. temperature coefficient 55 ppm/°C

• Temperature compensated for operation

• over the full temperature range

• Programmable output voltage

• 50μA to 100mA current sink capabil ity

• Low output noise

• All package options available in “Green” Molding

Compound (No Br, Sb) and Lead Free Finish/ RoHS

Compliant (Note 1)

Pin Assignments

Applications

• Shunt regulator

• Series regulator

• Voltage monitor

• Over voltage/ under voltage protection

• Switch mode power supplies

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit



+

V

REF

V

Z

GND

V

REF

V

Z

1

3

2

SOT23

(Top View)

1

2

3

4

V

Z

GND

V

REF

GND

SOT223

Pin 4 floating or

connected to pin 2

(Top View

)

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 2 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Absolute Maximum Ratings (Note 2)

Symbol Parameter Rating Unit

VZ Cathode Voltage 20 V

IZ Cathode Current 150 mA

TA Operating Temperature -40 to +85 °C

TST Storage Temperature -55 to +125 °C

PD Power Dissipation (Notes 3, 4) SOT23 330 mW

SOT223 2 W

Notes: 2. Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may

reduce device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin.

3. TJ, max =150°C.

4. Ratings apply to ambient temperature at 25°C.

Recommended Operating Conditions (TA = 25°C)

Symbol Parameter Min Max Unit

VZ Cathode Voltage VREF 20 V

IZ Cathode Current 0.05 100 mA

Electrical Characteristics (TA = 25°C unless other wise specified )

Symbol Parameter Test Conditions Min Typ. Max Unit

VREF Reference voltage (Note 5) 2%

1 %

0.5% IL = 10mA (Fig 1), VZ = VREF 2.45

2.475

2.487

2.50

2.55

2.525

2.513 V

VDEV Deviation of reference inp ut voltage

over temperature IL = 10mA, VZ = VREF

TA = Full range (Fig 1) 8.0 17 mV

ΔVREF

ΔVZ

Ratio of the change in reference

voltage to the change in cathode

voltage

VZ from VREF to 10V

IZ = 10mA (fig 2) -1.85 -2.7

mV/V

VZ from 10V to 20V

IZ = 10mA (Fig 2) -1.0 -2.0

IREF Reference input current R1 = 10k, R2 = O/C, IL = 10mA (Fig 2) 0.12 1.0 μA

ΔIREF Deviation of reference input current

over temperature R1 = 10k, R2 = O/C, IL = 10mA

TA = Full range (Fig 2) 0.04 0.2 μA

IZ(MIN) Minimum cathode current for

regulation VZ = VREF (Fig 1) 35 50 µA

IZ(OFF) Off-state current VZ = 20V, VREF = 0V (Fig 3) 0.1 μA

RZ Dynamic output impedance VZ = VREF (Fig 1), f = 0Hz 0.75

Ω

Note 5: 0.5% and 1% SOT23 only

For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 3 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

DC Test Circuits

Fig. 1 Test Circuit for VZ = VREF

Fig. 2 Test Circuit for VZ > VREF

Fig.3 Test Circuit for Off State Current

Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full

temperature range.

The average temperature coefficient of the reference input voltage, VREF is defin ed as:

)2T1T(V 1000000V

)C/ppm(V ref

dev

o

ref −

×

=

The dynamic output impedan c e, RZ is defined as:

z

zI

V

RΔ

Δ

=

When the device is program med with two external resistors,

R1 and R2, (Fig 2), the dynamic output impedance of the

overall circuit, R’, is defined as:

)

2R1R

1(RR z+=

′

Input

I

L

I

REF

I

Z

V

Z

V

REF

Input

I

L

I

REF

I

Z

V

Z

V

REF

R1

R2

Input

I

ZOFF

V

Z

T1 T2Temperature

V = V - V

DEV MAX MIN

V

MAX

V

MIN

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 4 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Typical Characteristics

-40 -20 020 40 60 80

TEMP ERATURE (°C)

Ref erence C urr ent vs. Temper a ture

160

140

130

120

110

100

R

E

F

E

R

E

N

C

E

C

U

R

E

N

T

(nA)

V = V

I = 10mA

REF

Z

0

CATHODE VOLTAGE (V)

Ch ange in V vs. C at h ode Volt age

REF

5101520

-10

-5

-15

-20

-25

CHANGE in REFERENCE OUTPUT

VOLTAGE (mV)

I = 10mA

Z

-40 -20 020 40 60 80

TEMP ERATU RE ( °C)

Cat hode Cur r ent vs. Tem peratu r e

24

26

28

30

32

34

36

38

M

I

N

I

M

U

M

C

A

T

H

O

D

E

C

U

R

E

N

T

(µA)

V = V

REF Z

100 F REQUENCY (Hz)

Dynamic Im pedance vs. Fre quency

1k 10k 100k 1M

0.1

1.0

10

100

DYNAMIC IMPEDANCE ( )

Ω

2.506

2.504

2.502

2.500

2.498

2.496

2.494

2.492

2.490

-40 -20 020 40 60 80

TEMPERATURE (°C)

Ref erence Volt age vs. Tem perature

R

EFE

R

EN CE V

O

LTA

G

E (V)

I = 10mA

Z

25 50 75 85 100

AMBIENT TEMPERATURE ( C)

Power Dissipation Derating

°

2.0

0

1.0

SOT223

SOT23

P

O

WE

R

DISSI

P

A

T

I

O

N (W)

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 5 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Typical Characteristics (cont.)

IZ = 10mA, TA = 25°C

Test Circuit for Open Loop Voltage Gain

TA = 25°C

Test Circuit for Pulse Response

VREF < VZ < 20, IZ = 10mA, TA = 25°C

Test Circuit for Stability Boundary Conditions

100 1k 10k 100k 1M

FREQUENCY (Hz)

Gai n vs. Frequency

0

20

40

60

O

P

EN L

O

P

V

O

L

T

A

G

E

G

AIN (dB)

0 0.2 0.4 0.6 0.8 1.0

TIME (µs)

Puls e Resp on se

0

5.0

1.0

2.0

3.0

V

O

L

T

A

G

E SWI

N

G

(V)

Repetitive Pulse

Single Pulse V

Z

INPUT

10p 100p 1000p 0.01µ 0.1µ 1µ

LOAD CAP ACITANCE (F)

St ability Boundary Conditions

0

20

40

60

80

100

C

A

T

H

O

DE

C

U

R

E

N

T

(mA)

STABLE STABLE

V

Z

230

I

Z

15k

9µF

8k25

+

-

220 V

Z

50

Input Monitor

Pulse

Generator

Input 150

I

Z

10k

V

Z

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 6 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Application Characteristics

VREF

2R1R

1

VOUT ⎟

⎠

⎞

⎜

⎝

⎛+=

SHUNT REGULATOR

VREF

2R1R

1

VOUT ⎟

⎠

⎞

⎜

⎝

⎛+=

HIGHER CURRENT SHUNT REGULATOR

VOUT(MIN) = VREF + VREG

VREF

2R1R

1

VOUT ⎟

⎠

⎞

⎜

⎝

⎛+=

OUTPUT CONTROL OF A THREE TERMINAL

FIXED REGULATOR

VREF

2R1R

1

VOUT ⎟

⎠

⎞

⎜

⎝

⎛+=

SERIES REGULATOR

SINGLE SUPPLY COMPARATOR WITH

TEMPERATURE COMPENSATED THRESHOLD

VREF

B2R B1R

1itlimLow ⎟

⎠

⎞

⎜

⎝

⎛++

VREF

A2R A1R

1itlimHigh ⎟

⎠

⎞

⎜

⎝

⎛++

OVER VOLTAGE/UNDER VOLTAGE

PROTECTION CIRCUIT

V+ V

OUT

V

REF

R1

R2

ZSR***

Common

IN OUT

V+

V

REF

V

OUT

R2

R1

30

Ω

0.01µF

V+ V

OUT

V

REF

R1

R2

V+ V

OUT

R1

R2

V

REF

V+

INPUT

V = 2.5V

TH

OUTPUT

V = V+

OFF

V 2V

ON

≈

V+

V

REF

OUTPUT

V

REF

R1A R1B

R2A R2B

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 7 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Ordering Information

Device Tolerance Package

Code Part Mark Packaging 7” Tape and Reel

Quantity Part Number

Suffix

ZR431F005-7 0.5% F 43R SOT23 3000/Tape & Reel -7

ZR431F005TA 0.5% F 43R SOT23 3000/Tape & Reel TA

ZR431F01-7 1% F 43B SOT23 3000/Tape & Reel -7

ZR431F01TA 1% F 43B SOT23 3000/Tape & Reel TA

ZR431FTA 2% F 43A SOT23 3000/Tape & Reel TA

ZR431GTA 2% G ZR431 SOT223 1000/Tape & Reel TA

Tolerance Packing

-7: Tape & Reel

TA : Tape & Reel

ZR431

X

XXX XX

005 : 0.5%

0.1 : 1%

Blank : 2%

Package

F : SOT23

G : SOT223

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 8 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOT23

(2) Package Type: SOT223

SOT23

Dim Min Max Typ

A 0.37 0.51 0.40

B 1.20 1.40 1.30

C 2.30 2.50 2.40

D 0.89 1.03 0.915

F 0.45 0.60 0.535

G 1.78 2.05 1.83

H 2.80 3.00 2.90

J 0.013 0.10 0.05

K 0.903 1.10 1.00

K1 - - 0.400

L 0.45 0.61 0.55

M 0.085 0.18 0.11

α 0° 8° -

All Dimensions in mm

SOT223

Dim Min Max Typ

A 1.55 1.65 1.60

A1 0.010 0.15 0.05

b1 2.90 3.10 3.00

b2 0.60 0.80 0.70

C 0.20 0.30 0.25

D 6.45 6.55 6.50

E 3.45 3.55 3.50

E1 6.90 7.10 7.00

e — — 4.60

e1 — — 2.30

L 0.85 1.05 0.95

Q 0.84 0.94 0.89

All Dimensions in mm

A

M

JL

D

F

BC

H

K

G

K1

A1

A

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

Document number: DS33255 Rev. 6 - 2 9 of 9

www.diodes.com October 2011

ADVANCE INFORMATION

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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

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changes without furt her notice to this document and any product descri bed herein. Diodes Inc orporated does not assume any liability

arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any

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