ZR2431 PDF даташит
Спецификация ZR2431 изготовлена «ETC» и имеет функцию, называемую «ADJUSTABLE PRECISION ZENER SHUNT REGULATOR». |
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Детали детали
Номер произв | ZR2431 |
Описание | ADJUSTABLE PRECISION ZENER SHUNT REGULATOR |
Производители | ETC |
логотип |
7 Pages
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ADJUSTABLE PRECISION
ZENER SHUNT REGULATOR
ISSUE 3 DECEMBER 1997
DEVICE DESCRIPTION
The ZR2431 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 15 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 ZR2431 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.
SCHEMATIC DIAGRAM
Vref
ZR2431
FEATURES
• Surface mount SOT23, SOT223, SOT89
and SO8 packages
• TO92 package
• 2.5% and 1% tolerance
• Maximum temperature coefficient 52
ppm/°C
• Temperature compensated for
operation over the full temperature
range
• Programmable output voltage
• 100µA to 25mA current sink capability
• Low output noise
APPLICATIONS
• Shunt regulator
• Series regulator
• Voltage monitor
• Over voltage/ under voltage protection
• Switch mode power supplies
VZ
4-154
Gnd
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ZR2431
ABSOLUTE MAXIMUM RATING
Cathode Voltage (VZ)
Cathode Current
15V
50mA
Operating Temperature -40 to 85°C
Storage Temperature
-55 to 125°C
Recommended Operating Conditions
Min Max
Cathode Voltage
Cathode Current
VREF 15V
100µA 25mA
Power Dissipation (Tamb=25°C,
Tjmax=150°C)
SOT23
330mW
SOT223
2W
SO8
780mW
TO92
780mW
SOT89
1.5W
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated):Tamb=25°C
PARAMETER
VALUE
SYMBOL MIN TYP MAX UNITS CONDITIONS
Reference Voltage 2.5% Vref
1.0%
1.209 1.24 1.271 V
1.228 1.24 1.252
IL=10mA (Fig1), VZ=Vref
Deviation of Reference Input Vdev
Voltage over Temperature
Ratio of the change in
∆Vref
Reference Voltage to the ∆VZ
Change in Cathode Voltage
4.0 8.0
0.5 2.0
mV
mV/V
IL=10mA, VZ=Vref
Ta=full range (Fig1)
VZ from Vref to 10V
IZ=10mA (Fig2)
Reference Input Current Iref
Deviation of Reference Input ∆Iref
Current over Temperature
Minimum Cathode
Current for Regulation
IZmin
0.02 0.11 0.4
0.02 0.2
µA
µA
30 100 µA
R1=10k, R2=O/C, lL=10mA (Fig2)
R1=10k, R2=O/C, IL=10mA
Ta=full range (Fig2)
†
Off-state Current
IZoff
10 30 µA
VZ=15V, Vref =0V (Fig3)
Dynamic Output Impedance RZ
0.25 2
Ω
VZ=Vref (Fig1), f=0Hz, IL=10mA
Deviation of reference input voltage, Vdev, is defined as the maximum variation of the
reference input voltage over the full temperature range.
Vmax
The average temperature coefficient of the
reference input voltage, Vref is defined as:
Vref
(ppm⁄
°C)=
Vdev x 1000000
Vref (T1−T2)
Vmin
Vdev = Vmax - Vmin
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)
† With a capacitance of greater than 100pF
between cathode and anode, minimum
cathode current must be 0.2mA.
T1 Temperature
T2
4-155
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ZR2431
TYPICAL CHARACTERISTICS
TYPICAL CHARACTERISTICS
140
130
Vref = Vz
Iz=10mA
120
110
100
90
80
-40
-20
0 20 40 60 80
Temperature (°C)
Reference Current v Temperature
26
Vref = Vz
24
22
20
18
16
14
-40
-20
0 20 40 60
Temperature (°C)
Cathode Current v Temperature
80
2
Iz = 10mA
1
0
-1
-2
-3
-4
-5
0
5 10
Cathode Voltage (V)
15
Change in Vref v Cathode Voltage
10 Vref = Vz
1mA
10mA
1
0.1
100
1k
10k 100k
Frequency (Hz)
Dynamic Impedance v Frequency
1.244
1.242
Iz=10mA
1.240
1.238
1.236
1.234
1.232
-40
-20
0 20 40 60
Temperature (°C)
Reference Voltage v Temperature
80
2.0
SOT 89
SOT 223
1.0
SO8/TO92
SOT23
0
25 50 75 85
Ambient Temprature (°C)
Power Dissipation Derating
100
4-156
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Номер в каталоге | Описание | Производители |
ZR2431 | ADJUSTABLE PRECISION ZENER SHUNT REGULATOR | ETC |
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ZR2431C02 | ADJUSTABLE PRECISION ZENER SHUNT REGULATOR | ETC |
ZR2431F01 | ADJUSTABLE PRECISION ZENER SHUNT REGULATOR | ETC |
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