Zetex (Now Diodes) ZH431C01, ZH431C02, ZH431F01, ZH431F02, ZH431G01, ZH431G02, ZH431N801, ZH431N802, ZH431Z01, ZH431Z02 Schematic [ru]

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ADJUSTABLE PRECISION

 

ZH431

ZENER SHUNT REGULATOR

 

Issue 2 - February 1998

 

 

 

 

 

 

 

DEVICE DESCRIPTION

FEATURES

The ZH431 is a three terminal adjustable shunt regulator offering excellent temperature stability and output current handling capability up to 30mA. The output voltage may be set to any chosen voltage between 2.5 and 36 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.They are also ideal for use in the feedback circuits of off line SMPUs as well as many general purpose regulator and reference applications where initial accuracy and low temperature coefficient are key requirements.

Note:

ZH431 is not recommended for new designs. Refer to ZR431

Surface mount SO8, SOT223,SOT23 and SOT89 packages

TO92 package

2% and 1% tolerance

Maximum temperature coefficient 55 ppm/°C

Temperature compensated for operation over the full temperature range

Programmable output voltage

50μA to 30mA current sink capability

Low output noise

APPLICATIONS

Shunt regulator

Series regulator

Voltage monitor

Over voltage/ under voltage protection

Switch mode power supplies

SCHEMATIC DIAGRAM

VZ

V ref

G

nd

4-15

ZH431

ABSOLUTE MAXIMUM RATING

Cathode Voltage (VZ)

40V

 

Power Dissipation (Tamb=25°C, Tjmax=150°C)

Cathode Current

50mA

 

SOT23

330mW

Operating Temperature

-40 to 85°C

TO92

780mW

Storage Temperature

-55 to 125°C

SOT223

2W

Recommended Operating Conditions

SO8

780mW

 

Min

Max

SOT89

1.5W

Cathode Voltage

Vref

36V

 

 

Cathode Current

50μA

30mA

 

 

ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25°C

 

 

 

SYMBOL

 

VALUE

 

 

 

PARAMETER

 

 

 

 

 

UNITS

CONDITIONS

 

MIN

TYP

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference Voltage

2%

 

Vref

2.45

2.50

2.55

V

IL=10mA (Fig1), VZ=Vref

 

1%

 

 

 

2.475

2.50

2.525

 

 

 

 

 

 

 

 

 

 

 

 

 

Deviation of Reference

 

Vdev

 

8.0

17

mV

IL=10mA, VZ=Vref

Input Voltage over

 

 

 

 

 

 

 

 

Ta=full range (Fig1)

Temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ratio of the change in

 

 

Vref

 

 

-0.7

-2.7

mV/V

VZ from Vref to 10V

Reference Voltage to the

 

VZ

 

 

 

 

IZ=10mA (Fig2)

Change in Cathode

 

 

 

 

 

-0.6

-2.0

mV/V

VZ from 10V to 36V

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

IZ=10mA (Fig2)

 

 

 

 

 

 

 

 

 

Reference Input Current

 

Iref

 

0.15

1.0

μA

R1=10k, R2=O/C, lL=10mA (Fig2)

Deviation of Reference

 

 

Iref

 

0.06

0.2

μA

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

Input Current over

 

 

 

 

 

 

 

 

Ta=full range (Fig2)

Temperature

 

 

 

 

 

 

 

 

 

 

Minimum Cathode

 

 

IZmin

 

21

50

μA

VZ=Vref

(Fig1)

Current for Regulation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dynamic Output Impedance

 

RZ

 

 

0.75

Ω

VZ=Vref

(Fig1), f=0Hz

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 defined as:

Vmax

 

 

Vmin

 

 

 

Vdev = Vmax - Vmin

 

T1

Temperature

T2

 

 

( ¤ )=Vdev x 1000000

Vref ppm °C Vref (T1T2)

The dynamic output impedance, Rz, is defined as:

RZ = VZ IZ

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:

R’=Rz (1+RR12)

4-16

ZH431

TYPICAL CHARACTERISTICS

 

200

 

 

 

 

 

 

VoltageReferenceinChange(mV)

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vref= Vz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Iz= 10mA

 

0

 

 

 

 

 

 

 

 

CurrentReference(nA)

180

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

160

 

 

 

 

 

 

-5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-10

 

 

 

 

 

 

 

 

 

140

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-15

 

 

 

 

 

 

 

 

 

120

 

 

 

 

 

 

 

-20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

-25

 

 

 

 

 

 

 

 

 

-40

-20

0

20

40

60

80

 

0

5

10

15

20

25

30

35

40

 

 

 

Temperature (°C)

 

 

 

 

 

Cathode Voltage (V)

 

 

 

Reference Current v Temperature

Change in Vref v Cathode Voltage

Minimum Cathode Current (uA)

26

 

 

 

 

Vref= Vz

 

Dynamic Impedance (Ohms)

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1mA

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

 

 

 

22

 

 

 

 

 

 

10

Vref=Vz

 

 

 

10mA

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

 

 

 

 

 

 

 

 

 

 

 

 

16

 

 

 

 

 

 

0.1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

0.01

 

 

 

 

 

-40

-20

0

20

40

60

80

100

1k

10k

100k

1M

Temperature (°C)

Frequency (Hz)

Cathode Current v Temperature

Dynamic Impedance v Frequency

 

2.52

 

 

 

 

 

Iz= 10mA

2.0

 

 

 

 

 

 

 

 

 

 

 

 

 

2.51

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SOT223

 

2.50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.0

 

 

 

2.49

 

 

 

 

 

 

PowerDissipation(W)

 

SOT89

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S08/T092

 

2.48

 

 

 

 

 

 

 

 

 

VoltageReference(V)

 

 

 

 

 

 

 

SOT23

 

 

 

 

 

 

 

 

 

 

2.47

 

 

 

 

 

 

0

 

 

 

-40

-20

0

20

40

60

80

25

50

75

100

Temperature (°C)

Ambient Temperature (°C)

Power Dissipation Derating

Reference Voltage v Temperature

4-17

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