Zetex ZR431C, ZR431C01, ZR431F, ZR431F005, ZR431F01 Datasheet
...
ADJUSTABLE PRECISION
ZENER SHUNT REGULATOR
ISSUE 4 – SEPTEMBER 2000
ZR431
DEVICE DESCRIPTION
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.
The devices can be used as a replacement
for zener diodes in many applications
requiring an improvement in zener
performance.
SCHEMATIC DIAGRAM
ref
V
FEATURES
Surface mount SO8, SOT223 and
SOT23 packages
TO92 package
2%, 1 % and 0.5% tolerance
Max. temperature coefficient 55 ppm/°C
Temperature compensated for operation
over the full temperature range
Programmable output voltage
50A to 100mA current sink capability
Low output noise
APPLICATIONS
Shunt regulator
Series regulator
Voltage monitor
Over voltage/ under voltage protection
Switch mode power supplies
V
Z
4-189
78
G
nd
ZR431
ABSOLUTE MAXIMUM RATING
Cathode Voltage (VZ) 20V
Cathode Current 150mA
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Recommended Operating Conditions
Min Max
Cathode Voltage Vref 20V
Cathode Current 50
A 100mA
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):T
ref
V
Z
ref
VALUE
MIN TYP MAX
2.45
2.475
2.489
(1)
0.5%
SYMBOL
V
ref
V
dev
PARAMETER
Reference Voltage 2%
1%
Deviation of Reference Input
Voltage over Temperature
Ratio of the change in
Reference Voltage to the
V
Change in Cathode
Voltage
Reference Input Current I
Deviation of Reference
ref
I
Input Current over
Temperature
Minimum Cathode
I
Zmin
Current for Regulation
Off-state Current I
Dynamic Output Impedance R
(1)
0.5% SOT23 only.
Zoff
Z
For definitions of reference voltage temperature coefficient and dynamic output impedance see
NOTES following DC TEST CIRCUITS
Power Dissipation (T
amb
=25°C,T
SOT23 330mW
TO92 780mW
SOT223 2W
SO8 780mW
UNITS CONDITIONS
2.50
2.50
2.50
2.55
VI
2.525
2.513
=10mA (Fig1), VZ=V
L
8.0 17 mV IL=10mA, VZ=V
Ta=full range (Fig1)
-1.85 -2.7 mV/V VZ from V
=10mA (Fig2)
I
Z
-1.0 -2.0 mV/V V
0.12 1.0
A
from 10V to 20V
Z
=10mA (Fig2)
I
Z
R1=10k, R2=O/C, l
to 10V
ref
(Fig2)
0.04 0.2
35 50
0.1
0.75
R1=10k, R2=O/C, I
A
T
a
V
A
A
Z=Vref
V
Z
VZ=V
=full range (Fig2)
(Fig1)
=20V, V
ref
(Fig1), f=0Hz
ref
=0V (Fig3)
ref
=10mA
L
=150°C)
jmax
=25°C
amb
ref
=10mA
L
4-190
78
TYPICAL CHARACTERISTICS
160
150
140
130
120
110
Reference Current (nA)
100
-40 0 20 40 60-20 80
Temperature (°C)
Reference Current v Temperature
Vref=VZ
IZ=10mA
0
-5
-10
-15
-20
-25
0
5101520
Change in Reference Output Voltage (mV)
Cathode Voltage (V)
Change in Vrefv Cathode Voltage
ZR431
IZ=10mA
38
A)
36
34
32
30
28
26
Minimum Cathode Current(
24
-40 0 20 40 60-20 80
Temperature (°C)
Cathode Current v Temperature
2.506
2.504
2.502
2.500
2.498
2.496
2.494
Reference Voltage (V)
2.492
2.490
-40 0 20 40 60-20 80
Temperature (°C)
Reference Voltage v Temperature
Vref=VZ
IZ=10mA
100
ref=VZ
V
)
10
1.0
Dynamic Impedance (
0.1
100 1k 10k 100k 1M
Frequency (Hz)
Dynamic Impedance v Frequency
SOT223
SO8/TO92
SOT23
1mA
10mA
4-191
78
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