ZETEX ZHT431C01STOB

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 range 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
Applications
•
Surface mount SOT223 and SOT23
packages
•
Series and shunt regulator
•
Voltage monitor
•
2% and 1% tolerance
•
Over voltage / under voltage protection
•
Maximum temperature coefficient
67 ppm/°C
•
Switch mode power supplies
•
Temperature compensated for operation
over the full temperature range
Pinout information
•
Programmable output voltage
•
50␮A to 100mA current sink capability
•
Low output noise
•
Wide temperature range -55 to +125°C
VZ
VREF
GND
GND
GND
VZ
SOT223
Pinout - Top view
VREF
SOT23
Pinout - Top view
Ordering information
Order reference
ZHT431C01L
ZHT431C01STOB
ZHT431C01STZ
ZHT431C02L
ZHT431C02STOB
ZHT431C02STZ
ZHT431F01TA
ZHT431F02TA
ZHT431G01TA
ZHT431G02TA
Tolerance Package Part mark Status
Reel size Quantity
(%)
(inches)
per reel
1
TO92 ZHT43101 Obsolete
Loose
4000
1
TO92 ZHT43101 Obsolete
12.5
1500
1
TO92 ZHT43101 Obsolete Concertina
1500
2
TO92 ZHT43102 Obsolete
Loose
4000
2
TO92 ZHT43102 Obsolete
12.5
1500
2
TO92 ZHT43102 Obsolete Concertina
1500
1
SOT23
43C
Released
7
3000
2
SOT23
43D
Released
7
3000
1
SOT223 ZHT43101 Released
7
1000
2
SOT223 ZHT43102 Released
7
1000
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© Zetex Semiconductors plc 2006
1
Tape
width
8mm
8mm
12mm
12mm
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ZHT431
Schematic diagram
VZ
VREF
Gnd
Absolute maximum rating
Cathode voltage (VZ)
20V
Power dissipation (Tamb=25°C)
Cathode current
150mA
(Tjmax = 150°C)
Operating temperature
-55 to 125°C
SOT23
330mW
Storage temperature
-55 to 150°C
TO92
780mW
SOT223
2W
Recommended operating conditions
Min.
Max.
Cathode voltage
VREF
20V
Cathode current
50µA
100mA
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ZHT431
Electrical characteristics test conditions (unless otherwise stated):Tamb=25°C
Symbol Parameter
VREF
Reference voltage
Value
Units Conditions
Min.
Typ.
Max.
2.45
2.50
2.55
V
1% 2.475
2.50
2.525
V
10
30
mV
2%
IL=10mA (Fig.1),
VZ=VREF
VDEV
Deviation of reference input
voltage over temperature
IL=10mA, VZ=VREF
Tamb=full range (Fig1)
∆V REF
----------------∆V Z
Ratio of the change in
reference voltage to the
change in cathode voltage
-1.85
-2.7
mV/V VZ from VREF to 10V
IZ=10mA (Fig.2)
-1.0
-2.0
mv/V VZ from 10V to 20V
IZ=10mA (Fig.2)
IREF
Reference input current
0.12
1.0
␮A
R1=10k, R2=O/C,
lL=10mA (Fig.2)
⌬IREF
Deviation of reference input
current over temperature
0.04
0.2
␮A
R1=10k, R2=O/C,
IL=10mA Tamb=full
range (Fig.2)
IZmin
Minimum cathode current
for regulation
35
50
␮A
VZ=VREF (Fig.1)
IZoff
Off-state current
0.1
␮A
VZ=20V, VREF=0V(Fig.3)
RZ
Dynamic output impedance
0.75
⍀
VZ=VREF (Fig.1), f=0Hz,
IC=1mA to 100mA
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:
V DEV x 1000000
ppm
V REF ⎛ ------------- ⎞ = ----------------------------------------⎝ °C ⎠
V REF ( T1 – T2 )
Vmax
The dynamic output impedance, RZ, is defined as:
RZ
∆V
= ---------Z∆ IZ
Vmin
Vdev = Vmax - Vmin
When the device is programmed with two externalresistors, R1
and R2, (fig 2) , the dynamic outputimpedance of the overall
circuit, R’, is defined as:
R′
T1
Temperature
T2
= R Z ( 1 + R1
------- )
R2
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ZHT431
Typical characteristics
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ZHT431
Typical characteristics
Open Loop Voltage Gain (dB)
60
VZ
IZ
230
40
15k
9µF
+
20
8k25
-
0
100
1k
10k
100k
1M
IZ = 10mA, TA = 25°C
Frequency (Hz)
Gain v Frequency
Test Circuit for Open Loop Voltage Gain
220
Input Monitor
3.0
VZ
Voltage Swing (V)
Repetitive pulse
2.0
Single pulse
VZ
1.0
Pulse
Generator
0
5.0
INPUT
0
0
0.2
0.4
0.6
0.8
1.0
Time (µs)
TA = 25°C
Test Circuit for Pulse Response
Pulse Response
100
Input
Cathode Current (mA)
50
80
150
VZ
IZ
STABLE
STABLE
10k
60
40
20
0
10p
100p
1000p
0.01µ
0.1µ
1µ
Load Capacitance (F)
Stability Boundary Conditions
Vref < VZ < 20, IZ = 10mA, TA = 25°C
Test Circuit for Stability Boundary Conditions
4-31
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ZHT431
DC test circuits
IL
VZ
Input
IZ
IL
IZ
Iref
R1
Iref
Vref
R2
Vref
Fig 1 - Test circuit for VZ = Vref
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© Zetex Semiconductors plc 2006
VZ
Input
Fig 2 - Test circuit for VZ > Vref
6
Input
IZOFF
Fig 3 - Test circuit for for Of
state current†
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ZHT431
Application circuits
V+Vout
V+Vout
R1
R1
Vref
Vref
R2
R2
Vout=
1+
R1
Vref
Vout=
R2
1+
R1
Vref
R2
Shunt regulator
Higher current shunt regulator
V+
ZSR***
+
Vout
Out
In
30⍀
Common
R1
0.01µF
Vref
R1
R2
Vref
Vout
R2
Vout MIN = Vref + Vreg
Vout=
1+
R1
Vref
R2
Vout=
1+
R1
Series regulator
V+
V+
R1B
R1A
Output
Input
Vref
R2
Output control of a
three terminal fixed regulator
V on
2V
Vref
Output
Vref
V off = V+
V TH = 2.5V
R2A
R2B
Low limit =
Single supply comparator
with temperature
compensated threshold
Issue 5 - October 2006
© Zetex Semiconductors plc 2006
1+
High limit = 1 +
R1B
Vref
R2B
R1A
Vref
R2A
Over voltage / under voltage
protection circuit
7
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ZHT431
Package outline - TO92
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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ZHT431
Package outline - SOT23
E
e
e1
b
3 leads
L1
D
E1
A
L
A1
Dim.
c
Millimeters
Inches
Min.
Max.
Min.
Max.
A
2.67
3.05
0.105
0.120
B
1.20
1.40
0.047
C
-
1.10
D
0.37
F
0.085
G
Dim.
Millimeters
Inches
Min.
Max.
Max.
Max.
H
0.33
0.51
0.013
0.020
0.055
K
0.01
0.10
0.0004
0.004
-
0.043
L
2.10
2.50
0.083
0.0985
0.53
0.015
0.021
M
0.45
0.64
0.018
0.025
0.15
0.0034
0.0059
N
0.95 NOM
-
-
1.90 NOM
0.075 NOM
0.0375 NOM
-
-
-
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZHT431
Package outline - SOT223
DIM
Millimeters
Inches
DIM
Millimeters
Min
Max
Inches
Min
Max
Min
Max
Min
Max
A
-
1.80
-
0.071
e
2.30 BSC
0.0905 BSC
A1
0.02
0.10
0.0008
0.004
e1
4.60 BSC
0.181 BSC
b
0.66
0.84
0.026
0.033
E
6.70
7.30
0.264
0.287
b2
2.90
3.10
0.114
0.122
E1
3.30
3.70
0.130
0.146
C
0.23
0.33
0.009
0.013
L
0.90
-
0.355
-
D
6.30
6.70
0.248
0.264
-
-
-
-
-
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches
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ZHT431
Intentionally left blank
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ZHT431
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 or visit: www.zetex.com
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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Zetex Semiconductors plc
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Oldham, OL9 9LL
United Kingdom
Telephone: (1) 631 360 2222
Fax: (1) 631 360 8222
[email protected]
Telephone: (852) 26100 611
Fax: (852) 24250 494
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Fax: (44) 161 622 4446
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© 2006 Published by Zetex Semiconductors plc
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