DIODES ZR431LF01TA

ZR431L
Adjustable precision shunt regulator
Summary
Description
The ZR431L is a three terminal adjustable shunt regulator offering excellent
temperature stability and output current handling capability up to 25mA.
The output voltage may be set to any chosen voltage between 1.24 and
10 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.
The ZR431L is particularly used in the feedback control loop of switch mode
power supplies. In this application the device 1.24 volt reference enables
the generation of low voltage supplies, typically 3.3 volts or 3 volts.
Features
•
2.5% and 1% tolerance
•
Max. temperature coefficient 50 ppm/°C
•
Temperature compensated for operation over -40 to 85°C
•
100mA to 25mA current sink capability
•
Surface mount SOT23 package
Applications
•
Switch mode power supplies
•
Shunt regulator
•
Series regulator
•
Voltage monitor
•
Over voltage / under voltage protection
Ordering information
Device
Pack
Part mark
Status
Quantity
per reel
Reel size
(inches)
TOL %
ZR431LF01TA
SOT23
43M
Active
3000
7
1
ZR431LF02TA
SOT23
43L
Active
3000
7
2.5
ZR431LC01STOB
TO92
ZR431L01
Obsolete
1500
1
ZR431LC02STOB
TO92
ZR431L02
Obsolete
1500
2.5
ZR431LC01L
TO92
ZR431L01
Obsolete
Loose
1
ZR431LC02L
TO92
ZR431L02
Obsolete
Loose
2.5
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ZR431L
Absolute maximum ratings
Parameter
Symbol
Limit
Unit
VZ
10
V
50
mA
Cathode voltage
Cathode current
Storage temperature
TSTG
-55 to 105
°C
Junction temperature
TJ
-40 to 125
°C
Power dissipation (at Tamb = 25°C unless otherwise stated)
Package
Value
Unit
330
mW
Parameter
Min.
Max.
Cathode voltage
VREF
10V
Cathode current
100␮A
25mA
Operating temperature
-40°C
85°C
SOT23
Recommended operating conditions
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ZR431L
Block diagram
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:
Vref ( ppmIC) =
Vdev x1000000
Vref (T1 − T 2)
The dynamic output impedance, Rz, is defined as:
RZ
=
ΔVZ
ΔI 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:
R' = RZ (1 +
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R1
)
R2
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ZR431L
Electrical characteristics (at Tamb = 25°C unless otherwise stated)
Parameter
Reference Voltage
Symbol
2.5% Vref
1.0% Vref
Min.
1.209
1.228
Typ.
1.24
1.24
Max.
1.271
1.252
Unit
V
V
Conditions
IL = 10mA (Fig1), VZ = Vref
IL = 10mA, VZ = Vref
Ta = full range (Fig 1)
Deviation of Reference
Input Voltage over
Temperature
Ratio of the change in
Reference Voltage to the
change in Cathode
Voltage)
Reference Input Current
Vdev
4.0
8.0
mV
ΔVref
0.5
2.0
mV/V
0.11
0.4
␮A
R1 = 10k, R2 = O/C,
lL = 10mA (fig2)
Deviation of Reference
Input Current over
Temperature
⌬Iref
0.02
0.2
␮A
R1 = 10k, R2 = O/C,
IL = 10mA Ta = full
range (Fig2)
Minimum Cathode
Current for Regulation
Off-state Current
IZmin
30
100
␮A
IZoff
10
30
␮A
0.25
2
Ω
Dynamic Output
Impedance
ΔVZ
Iref
RZ
0.02
VZ from Vref to 10V
IZ = 10mA (Fig2)
VZ = 10V, Vref = 0V
(Fig3)
VZ = Vref(Fig1), f = 0Hz,
IL = 10mA
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
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ZR431L
Change in reference voltage (mV)
Typical characteristics
Reference Current (nA)
140
130
120
110
100
90
80
-40
-25
-10
5
20
35
50
65
80
95
110
125
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
0
Dynamic Impedance (Ω)
Minimum cathode current (µA)
24
22
20
18
-25
-10
5
20
35
50
65
80
95
110
VREF = VKA
IK = 1mA
1
IK = 10mA
0.1
0.1
125
1
1.244
350
1.242
300
1.24
1.238
1.236
1.234
-25
-10
5
20
35
50
65
80
95
110
© Zetex Semiconductors plc 2008
100
250
200
150
100
50
-40
125
-25
-10
-5
20
35
50
65
80
95
110
125
Ambient temperature (°C)
Power dissipation derating
Temperature (°C)
Reference voltage vs Temperature
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10
Frequency (kHz)
Dynamic impedance vs frequency
Power dissipation (mW)
Reference voltage (V)
10
8
10
Temperature (°C)
Minimum cathode current vs temperature
1.232
-42
6
4
100
26
16
-40
2
Cathode voltage (V)
Change in reference voltage vs Cathode voltage
Temperature (°C)
Reference Current v Temperature
5
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ZR431L
Application circuits
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ZR431L
Typical characteristics
Open loop gain (dB)
60
50
40
30
20
10
0
0
1
10
100
2
Repetitive
pulse
VKA
1
Input Voltage swing (V)
Single
pulse
Output voltage swing (V)
Frequency (kHz)
Open loop gain vs frequency
0
5
2.5
VIN
0
-2.5
0
50
100
150
200
250
300
350
400
450
500
Time (μs)
Pulse response
Cathode current (mA)
30
25
20
15
10
5
0
0.01
0.1
1
10
100
1000
10000
Load capacitance (nF)
Stability boundary conditions
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ZR431L
SOT23 Package outline and pad layout details
E
0.95
0.037
e
e1
b
3 leads
2.0
0.079
L1
0.9
0.035
D
E1
L
A1
Dim.
mm
inches
0.8
0.031
A
c
Millimeters
Inches
Dim.
Millimeters
Min.
Max.
Min.
Max.
A
-
1.12
-
0.044
e1
A1
0.01
0.10
0.0004
0.004
E
2.10
2.64
0.083
0.104
b
0.30
0.50
0.012
0.020
E1
1.20
1.40
0.047
0.055
c
0.085
0.20
0.003
0.008
L
0.25
0.60
0.0098
0.0236
D
2.80
3.04
0.110
0.120
L1
0.45
0.62
0.018
0.024
-
-
-
-
-
e
0.95 NOM
Min.
0.037 NOM
Max.
Inches
1.90 NOM
Min.
Max.
0.075 NOM
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches.
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ZR431L
TO92 Package outline
VZ
1
GND
2
Vref
3
Underside view
Dim.
Millimeters
Inches
Min.
Max.
Min.
Max.
A
4.32
4.95
0.170
0.195
b
0.36
0.51
0.014
0.020
E
3.30
3.94
0.130
0.155
e
2.41
2.67
0.095
0.105
e1
1.14
1.40
0.045
0.055
L
12.70
15.49
0.500
0.610
R
2.16
2.41
0.085
0.095
S1
1.14
1.52
0.045
0.060
W
0.41
0.56
0.016
0.022
D
4.45
4.95
0.175
0.195
*°
4°
6°
4°
6°
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZR431L
Definitions
Product change
Zetex Semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or
service. Customers are solely responsible for obtaining the latest relevant information before placing orders.
Applications disclaimer
The circuits in this design/application note are offered as design ideas. It is the responsibility of the user to ensure that the circuit is fit for
the user’s application and meets with the user’s requirements. No representation or warranty is given and no liability whatsoever is
assumed by Zetex with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights
arising from such use or otherwise. Zetex does not assume any legal responsibility or will not be held legally liable (whether in contract,
tort (including negligence), breach of statutory duty, restriction or otherwise) for any damages, loss of profit, business, contract,
opportunity or consequential loss in the use of these circuit applications, under any circumstances.
Life support
Zetex 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 Zetex Semiconductors plc. As used herein:
A. Life support devices or systems are devices or systems which:
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 failure of the life support device or to affect its safety or effectiveness.
Reproduction
The product specifications contained in this publication are issued to provide outline information only which (unless agreed by the
company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a
representation relating to the products or services concerned.
Terms and Conditions
All products are sold subjects to Zetex’ terms and conditions of sale, and this disclaimer (save in the event of a conflict between the two
when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement.
For the latest information on technology, delivery terms and conditions and prices, please contact your nearest Zetex sales office.
Quality of product
Zetex is an ISO 9001 and TS16949 certified semiconductor manufacturer.
To ensure quality of service and products we strongly advise the purchase of parts directly from Zetex Semiconductors or one of our
regionally authorized distributors. For a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork
Zetex Semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels.
ESD (Electrostatic discharge)
Semiconductor devices are susceptible to damage by ESD. Suitable precautions should be taken when handling and transporting devices.
The possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. The extent
of damage can vary from immediate functional or parametric malfunction to degradation of function or performance in use over time.
Devices suspected of being affected should be replaced.
Green compliance
Zetex Semiconductors is committed to environmental excellence in all aspects of its operations which includes meeting or exceeding regulatory requirements with respect to the use of hazardous substances. Numerous successful programs have been implemented to reduce
the use of hazardous substances and/or emissions.
All Zetex components are compliant with the RoHS directive, and through this it is supporting its customers in their compliance with
WEEE and ELV directives.
Product status key:
“Preview”
Future device intended for production at some point. Samples may be available
“Active”
Product status recommended for new designs
“Last time buy (LTB)”
Device will be discontinued and last time buy period and delivery is in effect
“Not recommended for new designs” Device is still in production to support existing designs and production
“Obsolete”
Production has been discontinued
Datasheet status key:
“Draft version”
This term denotes a very early datasheet version and contains highly provisional information, which
may change in any manner without notice.
“Provisional version”
This term denotes a pre-release datasheet. It provides a clear indication of anticipated performance.
However, changes to the test conditions and specifications may occur, at any time and without notice.
“Issue”
This term denotes an issued datasheet containing finalized specifications. However, changes to
specifications may occur, at any time and without notice.
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© 2008 Published by Zetex Semiconductors plc
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