zr2431 Zetex Semiconductors plc., zr2431 Datasheet

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zr2431

Manufacturer Part Number
zr2431
Description
Adjustable Precision Zener Shunt Regulator
Manufacturer
Zetex Semiconductors plc.
Datasheet

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zr2431F01TA
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zr2431F02TA
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ADJUSTABLE PRECISION
ZENER SHUNT REGULATOR
ISSUE 3 DECEMBER 1997
DEVICE DESCRIPTION
The ZR2431 is a three terminal adjustable
s hu n t r e g u l a t or o f f e r i n g e xc el l e nt
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
r e qu i r i n g a n i mpr o ve me nt i n z e ner
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
V
ref
4-154
FEATURES
APPLICATIONS
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
100 A to 25mA current sink capability
Low output noise
Shunt regulator
Series regulator
Voltage monitor
Over voltage/ under voltage protection
Switch mode power supplies
V
G
ZR2431
Z
nd

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zr2431 Summary of contents

Page 1

... ADJUSTABLE PRECISION ZENER SHUNT REGULATOR ISSUE 3 DECEMBER 1997 DEVICE DESCRIPTION The ZR2431 is a three terminal adjustable temperature stability and output current handling capability up to 25mA. The output voltage may be set to any chosen voltage between 1 ...

Page 2

... Current for Regulation Off-state Current I Zoff Dynamic Output Impedance R Z Deviation of reference input voltage, V reference input voltage over the full temperature range. Vmax Vmin Vdev = Vmax - Vmin T1 Temperature ZR2431 Power Dissipation (T amb T =150°C) jmax SOT23 SOT223 SO8 TO92 SOT89 =25°C amb ...

Page 3

... ZR2431 TYPICAL CHARACTERISTICS TYPICAL CHARACTERISTICS TYPICAL CHARACTERISTICS 140 Vref = Vz Iz=10mA 130 120 110 100 90 80 -40 - Temperature (°C) Reference Current v Temperature 26 Vref = -40 - Temperature (°C) Cathode Current v Temperature 1.244 1.242 Iz=10mA 1.240 1.238 1.236 1 ...

Page 4

... STABLE 20 15 STABLE UNSTABLE 10p 100p 1n 10n .1µ 1µ 10µ Load Capacitance(F) Stablity Boundary Conditions ZR2431 I Z 47k 10 F 47k 10mA 25° Test Circuit for Open Loop Voltage Gain 120 Input Monitor Pulse 50 Generator T = 25°C ...

Page 5

... ZR2431 DC TEST CIRCUITS I L Input V Input ref ref Fig 1 – Test Circuit for V =V Fig 2 – Test Circuit for V z ref Input ref ref Fig 3 – Test Circuit for Off >V z ref 4-158 ...

Page 6

... MIN R1 Vout = 1 + Vref R2 OUTPUT CONTROL OF A THREE TERMINAL FIXED REGULATOR V+ OUTPUT INPUT off = 2. SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD 4-159 ZR2431 V+ Vout R1 Vref R2 R1 Vout = 1 + Vref R2 HIGHER CURRENT SHUNT REGULATOR V+ 30 0.01µF R1 Vout Vref R2 R1 Vout = 1 + Vref R2 ...

Page 7

... Bottom View ORDERING INFORMATION Part Number Package Tol % ZR2431N802 SO8 2.5 ZR2431N801 SO8 1 ZR2431G02 SOT223 2.5 ZR2431G01 SOT223 1 ZR2431F02 SOT23 2.5 ZR2431F01 SOT23 1 ZR2431Z02 SOT89 2.5 ZR2431Z01 SOT89 1 ZR2431C02 TO92 2.5 ZR2431C01 TO92 1 4-160 Part Mark ZR243102 ZR243101 ZR243102 ZR243101 24D 24E 24D 24E ZR243102 ZR243101 ...

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