Datasheet ZHT431F01-7, ZHT431F01TA, ZHT431F02TA, ZHT431FMTA Datasheet (Diodes)

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ZHT431

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

Description

The ZHT431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 100mA. The device offers extended operating temperature rang e working from -55 to +125°C.

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 SOT23 package

• 0.5%, 1% and 2% tolerance

• Maximum temperature coefficient 67ppm/°C

• Temperature compensated for operation over the full temperature range

• Programmable output voltage

• 50μA to 100mA current sink capability

• Low output noise

• Available in “Green” Molding Compound (See page 7)

• Wide temperature range -55 to +125°C

Applications

• Series and shunt regulator

• Voltage monitor

• Over voltage / under voltage protection

• Switch mode power supplies

Pin Assignments

GND

SOT23

(Top View)

V

Z

V

REF

Typical Application Circuit

ZHT431

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Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)

Parameter Rating Unit

V

Cathode Voltage (VZ)

20

Cathode Current 150 mA Operating Temperature -55 to 125 °C Storage Temperature -55 to 150 °C Power Dissipation

(T

= 25°C, T

amb

JMAX

= 150°C)

330 mW

Recommended Operating Conditions

Parameter Min Max Units

Cathode Voltage V

REF

Cathode Current 0.05 100 mA

- 20 V

ZHT431

Electrical Characteristics (Test conditions unless otherwise specified: T

Symbol Parameter

V

REF

Reference Voltage 2% 1%

0.5%

V

DEV

ΔV ΔV

I

REF

ΔI

REF

I

Zmin

I

Zof

RZ

REF

Deviation of reference input voltage over temperature

Ratio of the change in reference voltage to the change in cathode voltage

Z

Reference input current

Deviation of reference input current over temperature

Minimum cathode current for regulation Off-state current Dynamic output impedance

Deviation of reference input voltage, V

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

DEV

Min. Typ. Max.

2.45

2.475

2.4875

temperature range. The average temperature coefficient of the reference input voltage, V

Values

2.50

2.55

2.525

2.5125

10 30 mV

-1.85 -2.7 mV/V

-1.0 -2. mV/V

0.12 1.0 µA

0.04 0.2 µA

35 50 µA

0.1 µA

0.75 V

is defined as:

REF

= 25°C)

amb

Units Conditions

I

=10mA (Fig.1),

L

V

Z=VREF

I

=10mA, VZ=V

L

=full range (Fig1)

T

amb

from V

V

Z

=10mA (Fig.2)

I

Z

VZ from 10V to 20V

=10mA (Fig.2)

I

Z

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

=10mA (Fig.2)

L

R1=10k, R2=O/C, IL=10mA T

(Fig.2) V

Z=VREF

=20V, V

V

Z

V

Z=VREF

=1mA to 100mA

I

C

REF

to 10V

REF

=full range

amb

(Fig.1)

=0V(Fig.3)

REF

(Fig.1), f=0Hz,

The dynamic output impedance, R

, is defined as:

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:

ZHT431

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Typical Operating Conditions

170

160

150

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ZHT431

0

I = 10mA

Z

-5

140

130

120

Reference Current (nA)

110

100

90

-50 125-25 10007525 50

40

38

36

34

32

30

28

Minimum Cathode Current (µA)

26

Temperature (°C)

I vs. Tempe rature

REF

-10

-15

-20

Change in Reference Output Voltage (mV)

-25 02015510

Change in V vs. Ca thode Voltage

100

V = V

REF Z

10

1.0

Dynamic Impedance ( )Ω

Cathode Voltage (V)

REF

1mA

10mA

24

-50 125-25 10007525 50

2.50

2.500

2.498

2.496

2.494

2.492

Reference Voltage (V)

2.490

2.488

2.486

-50 125-25 10007525 50

ZHT431

Document number: DS32157 Rev. 11 - 2

Temperature (°C)

I vs. Temperature

ZMIN

Temperature ( C)°

V vs. Temperature

REF

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0.1 100 1K 10K 100K 1M

Dynamic Im pedance vs. Frequency

0.

0.4

0.3

0.2

Power Dissipation (W)

0.1

0

25 12550 10075

Frequency (Hz)

Ambient Temperature (°C)

Powe r Dissipation Derati n g

150

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Typical Operating Conditions (Cont.)

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ZHT431

60

)Bd(niaGegatloVpooLnepO

40

20

0

100 1k 10k 100k 1M

Frequency (Hz)

Gain v Frequency

3.0

)V(gniwSegatloV

2.0

1.0

0

5.0 0

Repetitive pulse

Single pulse

V

Z

INPUT

I

Z

15k

9μF

+

=10mA,

I

Z

8k25

T

A

=25°C

-

Test Circuit for Open Loop Voltage Gain

220

Input Monitor

Pulse

Generator

50

230

V

Z

V

Z

00.40.60.81.00.2

Time (µs)

Pulse Response

100

80

)Am(tnerruCedohtaC

60

40

20

0

10p

100p 1000p

STABLESTABLE

0.01µ0.1

Load Capacitance (F)

Stability Boundary Conditions

Test Circuit for Pulse Response

Input

µ

1

V

ref<VZ

Test Circuit for Stability Boundary Conditions

TA=25°C

150

I

Z

10k

< 20, IZ=10mA,TA= 25°C

V

Z

ZHT431

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DC Test Circuits

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ZHT431

I

Input Input Input

L

I

ref

V

ref

Fig 1 - Test circu it for VZ=V

V

Z

I

Z

R1

R2

ref

Fig 2 - Test circu it for VZ>V

I

L

I

ref

V

ref

V

Z

I

Z

ref

Fig 3 - Test circuit for

Off state current

I

ZOFF

†

V

ZHT431

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Application Circuits

V+Vout

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ZHT431

V+Vout

R1

Vref

R2

R1

1+

Vout=

+

ZSR***

In

Common

Vout = Vref + Vreg

MIN

Vout= 1 +

R1 R2

R2

Out

Vref

Vout

R1

Vref

R2

Vref

Output control of a

three terminal fixed regulator

V+

Vref

Higher current shunt regulatorShunt regulator

Vref

Vout= 1 +

Series regulator

R1

R2

Vout=

30Ω

0.01µF

R2

R1

1+

R1 R2

Vref

Vout

Vref

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V+

R1A

Vref

R2A

Low limit =

High limit =

R1B

R2B

1+

R1B R2B

R1A R2A

Over voltage / under voltage

protection circuit

Vref

Output

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V+

Output

2V

V

Input

V

TH

=2.5V

on

=V+

V

off

Single supply comparator

with temperature

compensated threshold

ZHT431

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ZHT431

Ordering Information

Ordering

Reference

ZHT431F01TA 1 1 SOT23 43C Active 7 3000 8mm

ZHT431F01-7 2 1 SOT23 43C Active 7 3000 8mm ZHT431FMTA 1 0.5 SOT23 43P Active 7 3000 8mm ZHT431F02TA 1 2 SOT23 43D Active 7 3000 8mm

Notes: 1. A ‘Green’ molding compound is used from date code 1010. For further details, refer to http://www.diodes.com/quality/lead_free.html

2. All date codes of the ‘-7’ option use ‘Green’ molding compound.

Tolerance

(%)

Package Part Mark Status

Reel Size

(inches)

Quantity

per reel

Tape

Width

Package Outline Dimensions

SOT23

ZHT431

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ZHT431

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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 instructions for use 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

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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 against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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IMPORTANT NOTICE

LIFE SUPPORT

ZHT431

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