Diodes ZR431 User Manual

)

Description

The ZR431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. T he 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.

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

Pin Assignments

V

REF

V

Z

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 capability

• Low output noise

• All package options available in “Green” Molding

ADVANCE INFORMATION

Compound (No Br, Sb) and Lead Free Finish/ RoHS Compliant (Note 1)

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.

Applications

• Shunt regulator

• Series regulator

• Voltage monitor

• Over voltage/ under voltage protection

• Switch mode power supplies

(Top View)

3

2

SOT23

1

GND

(Top View

V

1

Z

GND

2

V

3

REF

SOT223

Pin 4 floating or

connected to pin 2

ZR431

4

GND

Typical Application Circuit

V

ZR431

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

REF

+

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V

Z

GND

October 2011

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

Absolute Maximum Ratings (Note 2)

Symbol Parameter Rating Unit

VZ

IZ

TA

TST

PD

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. T

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

Cathode Voltage 20 V

Cathode Current 150 mA Operating Temperature -40 to +85 Storage Temperature -55 to +125

Power Dissipation (Notes 3, 4)

, max =150°C.

J

SOT23 330 mW SOT223 2 W

Recommended Operating Conditions (T

= 25°C)

A

Symbol Parameter Min Max Unit

VZ

IZ

ADVANCE INFORMATION

Cathode Voltage Cathode Current 0.05 100 mA

V

REF

20 V

Electrical Characteristics (T

= 25°C unless otherwise specified)

A

Symbol Parameter Test Conditions Min Typ. Max Unit

Reference voltage (Note 5) 2%

V

1 %

REF

= 10mA (Fig 1), VZ = V

I

L

REF

0.5%

V

ΔV

I

REF

ΔI

I

Z(MIN)

I

Z(OFF)

RZ

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

Deviation of reference input voltage

DEV

over temperature

Ratio of the change in reference

REF

voltage to the change in cathode

Z

voltage

Reference input current Deviation of reference input current

REF

over temperature Minimum cathode current for

regulation Off-state current Dynamic output impedance

IL = 10mA, VZ = V TA = Full range (Fig 1) V

from V

Z

I

= 10mA (fig 2)

Z

REF

to 10V

VZ from 10V to 20V I

= 10mA (Fig 2)

Z

R1 = 10k, R2 = O/C, IL = 10mA (Fig 2) R1 = 10k, R2 = O/C, I

= Full range (Fig 2)

T

A

= V

V

Z

VZ = 20V, V VZ = V

(Fig 1)

REF

(Fig 1), f = 0Hz

REF

= 10mA

L

= 0V (Fig 3)

2.45

2.475

2.487

2.50

2.55

2.525

2.513

8.0 17 mV

-1.85 -2.7

-1.0 -2.0

0.12 1.0 μA

0.04 0.2 μA

35 50 µA

0.1 μA

0.75

ZR431

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ZR431

°

C

°

C

V

mV/V

Ω

October 2011

DC Test Circuits

Input

I

L

I

REF

V

REF

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

I

REF

V

L

REF

V

Z

I

Z

V

Z

I

Z

Input

R1

R2

Input

I

ZOFF

V

Z

Fig. 1 Test Circuit for V

Z

= V

REF

Fig. 2 Test Circuit for VZ > V

Deviation of reference input voltage, V temperature range.

ADVANCE INFORMATION

The average temperature coefficient of the reference input voltage, V

V

MAX

V = V - V

V

MIN

DEV MAX MIN

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

DEV

REF

is defined as:

REF

Fig.3 Test Circuit for Off State Current

1000000V

ref

o

)C/ppm(V

=

dev

ref

×

−

)2T1T(V

The dynamic output impedance, RZ is defined as:

V

Δ

R

z

=

I

Δ

z

When the device is programmed with two external resistors, R1 and R2, (Fig 2), the dynamic output impedance of the overall circuit, R’, is defined as:

′

1R

)

1(RR

+=

z

2R

T1 T2Temperature

ZR431

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R

F

R

N

CE CUR

REN

T

MINIMUM CATHO

DE CUR

REN

T

R

O

G

P

OWER

PATIO

Typical Characteristics

(nA)

E E E

160

140

130

120

110

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

V = V

Z

REF

I = 10mA

Z

0

I = 10mA

Z

-5

-10

-15

VOLT AGE (mV)

-20

CHANGE in REFERENCE OUTPUT

100

-40 -20

38

36

(µA)

ADVANCE INFORMATION

34

32

30

28

26

24

-40 -20

2.506

2.504

0

20 40 60 80

TEMPERATURE (°C)

Reference Current vs. Temperature

V = V

REF Z

0

20 40 60 80

TEMPERATURE (°C)

Cathod e C ur r ent vs. Temperature

I = 10mA

Z

100

Ω

DYNAMIC IMPEDANCE ( )

2.0

-25

10

1.0

0.1

5101520

CATHODE VOLTAGE (V)

Change in V vs. C athode Voltag e

100

Dynamic I m pedance vs. Frequency

REF

1k 10k 100k 1M

FREQUENCY (Hz)

2.502

E (V)

2.500

LTA

2.498

ENCE V

2.496

2.494

EFE

2.492

2.490

-40 -20 Reference Voltage vs. Temperature

20 40

0

TEMPERATURE (°C)

60 80

N (W)

1.0

DISSI

0

25 50 75 85 100

AMBIENT TEMPERATURE ( C)

Power Dissipation Derating

SOT223

SOT23

°

ZR431

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ZR431

O

P

OOP VOLTAGE G

OLTAG

N

G

CATHO

C

URR

N

T

Typical Characteristics (cont.)

ADVANCE INFORMATION

ZR431

Document number: DS33255 Rev. 6 - 2

60

AIN (dB)

40

20

EN L

0

100 1k 10k 100k 1M

FREQUENCY (Hz)

Gain vs. Frequency

3.0

2.0

(V)

1.0

E SWI

0

V

5.0 0

0 0.2 0.4 0.6 0.8 1.0

100

80

(mA) E

60

40

DE

20

0

10p 100p 1000p 0.01µ 0.1µ 1µ

Repetitive Pulse

Single Pulse

TIME (µs)

Pulse Response

STABLE

LOAD CAPACITANCE (F)

Stability Boundary Conditions

STABLE

V

INPUT

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

I

Z

15k

9µF

8k25

= 10mA, TA = 25°C

I

Z

Test Circuit for Open Loop Voltage Gain

Input Monitor

220

Z

Pulse

Generator

50

= 25°C

T

A

Test Circuit for Pulse Response

Input

150

I

Z

10k

< VZ < 20, IZ = 10mA, TA = 25°C

V

REF

Test Circuit for Stability Boundary Conditions

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230

+

-

V

Z

V

Z

V

Z

October 2011

Application Characteristics

V+ V

V

REF

V

OUT

SHUNT REGULATOR

ZSR***

V+

ADVANCE INFORMATION

IN OUT

R1

R2

⎛ ⎜

⎝

Common

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

OUT

V+

V

REF

1R

⎞

1

+=

⎟

2R

⎠

V

REF

V

OUT

HIGHER CURRENT SHUNT REGULATOR

V

OUT

R1

V+

R1

R2

V

OUT

1R

⎛ ⎜

⎝

⎞

1

+=

⎟

2R

⎠

V

REF

30

Ω

V

REF

R2

V

OUT(MIN)

V

OUT

= V

REF

⎛

1

⎜ ⎝

+=

+ V

1R

2R

⎞ ⎟

⎠

REG

V

REF

OUTPUT CONTROL OF A THREE TERMINAL

FIXED REGULATOR

V+

OUTPUT

V 2V

≈

ON

V = V+

OFF

INPUT

V = 2.5V

TH

SINGLE SUPPLY COMPARATOR WITH

TEMPERATURE COMPENSATED THRESHOLD

ZR431

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0.01µF

R1

V

REF

R2

V

OUT

1R

V

OUT

⎛ ⎜

⎝

⎞

1

+=

⎟

2R

⎠

V

REF

SERIES REGULATOR

V+

R1A

R1B

V

REF

V

REF

R2A

R2B

B1R

⎛

1itlimLow

⎜ ⎝

⎛

1itlimHigh

⎜ ⎝

⎞

++

⎟

B2R

⎠

A1R

⎞

++

⎟

A2R

⎠

V

REF

OVER VOLTAGE/UNDER VOLTAGE

PROTECTION CIRCUIT

OUTPUT

October 2011

X

Ordering Information

ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

ZR431

XXX XX

Package

F : SOT23

G : SOT223

Device Tolerance

ZR431F005-7

ZR431F005TA

ZR431F01-7

ZR431F01TA

ZR431FTA

ADVANCE INFORMATION

ZR431GTA

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

0.5% F 43R SOT23 3000/Tape & Reel TA 1% F 43B SOT23 3000/Tape & Reel -7

1% F 43B SOT23 3000/Tape & Reel TA 2% F 43A SOT23 3000/Tape & Reel TA 2% G ZR431 SOT223 1000/Tape & Reel TA

Package

Code

Tolerance

005 : 0.5%

0.1 : 1%

Packing

-7: Tape & Reel

TA : Tape & Reel

Blank : 2%

Part Mark Packaging

7” Tape and Reel

Quantity

Part Number

Suffix

ZR431

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ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SOT23

(2) Package Type: SOT223

ADVANCE INFORMATION

K

J

A

H

F

G

C

B

K1

D

L

A

A1

ZR431

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

M

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

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

SOT23

0° 8° -

All Dimensions in mm

SOT223

ZR431

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ZR431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY A ND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporat ed 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 license under its patent or trademark rights, nor the rights of others. A ny Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harml ess ag ai nst all damages.

Diodes Incorporated does not warrant or acc ept any liability whatsoever in respec t of any products purchas ed through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless agai nst all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death ass ociated with such unintended or unauthorized application.

Products described herein may be covered by one or more United Stat es, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herei n:

A. Life support devices or systems are devices or systems which:

ADVANCE INFORMATION

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructi ons for us e provided in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness .

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives agai nst any damages arising out of the use of Diodes Incorporated products in such safety-critic al, l ife support devic es or syst ems .

www.diodes.com

IMPORTANT NOTICE

LIFE SUPPORT

ZR431

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Diodes ZR431 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual