ZR431

ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Description
Pin Assignments
ADVANCE INFORMATION
The ZR431 is a three terminal adjustable shunt regulator
offering excellent temperature stability and output current
handling capability up to 100mA. The output voltage may be
set to any chosen voltage between 2.5 and 20 volts by
selection of two external divider resistors.
(Top View)
(Top View)
VZ 1
VREF 3
1 GND
The devices can be used as a replacement for zener diodes
in many applications requiring an improvement in zener
performance.
VZ
SOT223
Pin 4 floating or
connected to pin 2
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
Compound (No Br, Sb) and Lead Free Finish/ RoHS
Compliant (Note 1)
Notes:
4 GND
VREF 3
2
SOT23
•
•
•
•
•
•
•
•
GND 2
Applications
•
•
•
•
•
Shunt regulator
Series regulator
Voltage monitor
Over voltage/ under voltage protection
Switch mode power supplies
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.
Typical Application Circuit
VZ
VREF
+
GND
ZR431
Document number: DS33255 Rev. 6 - 2
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Absolute Maximum Ratings (Note 2)
Symbol
ADVANCE INFORMATION
VZ
Parameter
IZ
Cathode Current
TA
Operating Temperature
TST
Storage Temperature
PD
Notes:
Rating
Unit
20
V
150
mA
Cathode Voltage
-40 to +85
°
-55 to +125
°
SOT23
SOT223
Power Dissipation (Notes 3, 4)
C
C
330
2
mW
W
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. TJ, max =150°C.
4. Ratings apply to ambient temperature at 25°C.
Recommended Operating Conditions (TA = 25°C)
Symbol
Parameter
Min
Max
Unit
VZ
Cathode Voltage
VREF
20
V
IZ
Cathode Current
0.05
100
mA
Electrical Characteristics (TA = 25°C unless otherwise specified)
Symbol
Parameter
Reference voltage (Note 5)
VREF
Test Conditions
2%
1%
0.5%
IL = 10mA (Fig 1), VZ = VREF
Deviation of reference input voltage IL = 10mA, VZ = VREF
over temperature
TA = Full range (Fig 1)
VDEV
ΔVREF
ΔVZ
Ratio of the change in reference
voltage to the change in cathode
voltage
VZ from VREF to 10V
IZ = 10mA (fig 2)
VZ from 10V to 20V
IZ = 10mA (Fig 2)
IREF
Min
Typ.
Max
Unit
2.45
2.475
2.487
2.50
2.50
2.50
2.55
2.525
2.513
V
8.0
17
mV
-1.85
-2.7
mV/V
-1.0
-2.0
0.12
1.0
μA
0.04
0.2
μA
35
50
µA
Reference input current
R1 = 10k, R2 = O/C, IL = 10mA (Fig 2)
ΔIREF
Deviation of reference input current
over temperature
R1 = 10k, R2 = O/C, IL = 10mA
IZ(MIN)
Minimum cathode current for
regulation
VZ = VREF (Fig 1)
IZ(OFF)
Off-state current
VZ = 20V, VREF = 0V (Fig 3)
0.1
μA
Dynamic output impedance
VZ = VREF (Fig 1), f = 0Hz
0.75
Ω
RZ
Note 5:
TA = Full range (Fig 2)
0.5% and 1% SOT23 only
For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS
ZR431
Document number: DS33255 Rev. 6 - 2
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
DC Test Circuits
IL
IL
VZ
Input
VZ
Input
VZ
Input
ADVANCE INFORMATION
IZOFF
IZ
IREF
R1
R2
VREF
Fig. 1 Test Circuit for VZ = VREF
IZ
IREF
VREF
Fig. 2 Test Circuit for VZ > VREF
Fig.3 Test Circuit for Off State Current
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
Vref (ppm / o C) =
Vdev × 1000000
Vref (T1 − T2)
The dynamic output impedance, RZ is defined as:
Rz =
VDEV = VMAX - VMIN
VMIN
ΔV z
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′ = R z (1 +
T1
Temperature
ZR431
Document number: DS33255 Rev. 6 - 2
R1
)
R2
T2
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Typical Characteristics
160
REFERENCE CURRENT (nA)
ADVANCE INFORMATION
140
140
130
120
110
100
-40
CHANGE in REFERENCE OUTPUT
VOLTAGE (mV)
0
VREF = VZ
IZ = 10mA
-10
-15
-20
5
10
15
CATHODE VOLTAGE (V)
Change in VREF vs. Cathode Voltage
20
100
VREF = VZ
36
DYNAMIC IMPEDANCE (Ω)
MINIMUM CATHODE CURRENT (µA)
-5
-25
0
20
40
60
80
TEMPERATURE (°C)
Reference Current vs. Temperature
-20
38
34
32
30
28
10
1.0
26
24
-40
0.1
100
0
20
40
60
80
TEMPERATURE (°C)
Cathode Current vs. Temperature
-20
1k
10k
100k
FREQUENCY (Hz)
Dynamic Impedance vs. Frequency
1M
2.0
2.506
IZ = 10mA
POWER DISSIPATION (W)
2.504
REFERENCE VOLTAGE (V)
IZ = 10mA
2.502
2.500
2.498
2.496
2.494
SOT223
1.0
SOT23
2.492
2.490
-40
0
25
-20
20
40
0
60
80
TEMPERATURE (°C)
Reference Voltage vs. Temperature
ZR431
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50
75 85
AMBIENT TEMPERATURE (°C)
Power Dissipation Derating
100
October 2011
© Diodes Incorporated
ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Typical Characteristics (cont.)
60
ADVANCE INFORMATION
OPEN LOOP VOLTAGE GAIN (dB)
VZ
IZ
230
15k
40
9µF
+
20
0
100
-
8k25
1k
10k
100k
FREQUENCY (Hz)
Gain vs. Frequency
1M
IZ = 10mA, TA = 25°C
Test Circuit for Open Loop Voltage Gain
220
Input Monitor
3.0
VZ
VOLTAGE SWING (V)
Repetitive Pulse
2.0
Single Pulse
VZ
Pulse
Generator
1.0
50
0
5.0
INPUT
0
TA = 25°C
0
0.2
0.4
0.6
TIME (µs)
Pulse Response
0.8
1.0
Test Circuit for Pulse Response
CATHODE CURRENT (mA)
100
Input
80
150
VZ
IZ
10k
STABLE
STABLE
60
40
20
0
10p
100p
1000p 0.01µ
0.1µ
LOAD CAPACITANCE (F)
Stability Boundary Conditions
ZR431
Document number: DS33255 Rev. 6 - 2
VREF < VZ < 20, IZ = 10mA, TA = 25°C
1µ
Test Circuit for Stability Boundary Conditions
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Application Characteristics
V+
V+
VOUT
VOUT
R1
R1
ADVANCE INFORMATION
VREF
VREF
R2
R2
R1 ⎞
⎛
⎟V
V OUT = ⎜1 +
R2 ⎠ REF
⎝
R1 ⎞
⎛
⎟V
V OUT = ⎜ 1 +
R2 ⎠ REF
⎝
SHUNT REGULATOR
HIGHER CURRENT SHUNT REGULATOR
V+
ZSR***
V+
IN
VOUT
OUT
30Ω
Common
R1
0.01µF
VREF
R1
R2
VOUT
VREF
R2
VOUT(MIN) = VREF + VREG
R1 ⎞
⎛
⎟V
V OUT = ⎜1 +
R
2 ⎠ REF
⎝
R1 ⎞
⎛
⎟V
V OUT = ⎜ 1 +
R2 ⎠ REF
⎝
OUTPUT CONTROL OF A THREE TERMINAL
FIXED REGULATOR
SERIES REGULATOR
V+
V+
R1A
R1B
VREF
OUTPUT
OUTPUT
VREF
INPUT
VON ≈ 2V
VOFF = V+
R2A
R2B
VTH = 2.5V
SINGLE SUPPLY COMPARATOR WITH
TEMPERATURE COMPENSATED THRESHOLD
R1B ⎞
⎛
Low lim it + ⎜ 1 +
⎟ V REF
⎝ R2B ⎠
R1A ⎞
⎛
High lim it + ⎜ 1 +
⎟ V REF
⎝ R2 A ⎠
OVER VOLTAGE/UNDER VOLTAGE
PROTECTION CIRCUIT
ZR431
Document number: DS33255 Rev. 6 - 2
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Ordering Information
ADVANCE INFORMATION
ZR431 X XXX XX
Package
Tolerance
Packing
F : SOT23
G : SOT223
005 : 0.5%
0.1 : 1%
Blank : 2%
-7: Tape & Reel
TA : Tape & Reel
7” Tape and Reel
Part Number
Quantity
Suffix
Tolerance
Package
Code
Part Mark
Packaging
ZR431F005-7
0.5%
F
43R
SOT23
3000/Tape & Reel
-7
ZR431F005TA
0.5%
F
43R
SOT23
3000/Tape & Reel
TA
ZR431F01-7
1%
F
43B
SOT23
3000/Tape & Reel
-7
ZR431F01TA
1%
F
43B
SOT23
3000/Tape & Reel
TA
ZR431FTA
2%
F
43A
SOT23
3000/Tape & Reel
TA
ZR431GTA
2%
G
ZR431
SOT223
1000/Tape & Reel
TA
Device
ZR431
Document number: DS33255 Rev. 6 - 2
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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Package Outline Dimensions (All Dimensions in mm)
(1) Package Type: SOT23
ADVANCE INFORMATION
A
B C
H
K
M
K1
D
J
F
G
L
SOT23
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
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
0°
8°
α
All Dimensions in mm
(2) Package Type: SOT223
SOT223
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
A
A1
ZR431
Document number: DS33255 Rev. 6 - 2
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© Diodes Incorporated
ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
IMPORTANT NOTICE
ADVANCE INFORMATION
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 AND 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 Incorporated 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
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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, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
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Products described herein may be covered by one or more United States, international or foreign patents pending. Product names
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LIFE SUPPORT
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 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.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
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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.
Copyright © 2011, Diodes Incorporated
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ZR431
Document number: DS33255 Rev. 6 - 2
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