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PDF ZHT2431C02 Data sheet ( Hoja de datos )

Número de pieza ZHT2431C02
Descripción HIGH TEMPERATURE ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
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HIGH TEMPERATURE ADJUSTABLE
PRECISION ZENER SHUNT REGULATOR
ZHT2431
ISSUE 1 JULY 1997
DEVICE DESCRIPTION
FEATURES
The ZHT2431 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 ZHT2431 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.
The ZHT2431 is intended for use over the
extended operating range of -55°C to 125°C.
Surface mount SOT23 package
TO92 package
2.5% tolerance
Average temperature coefficient 50 ppm/°C
Temperature compensated for operation
over the full temperature range
Programmable output voltage
100µA to 25mA current sink capability
Low output noise
-55° to 125° C operation
APPLICATIONS
Shunt regulator
Series regulator
Voltage monitor
Over voltage/ under voltage protection
Switch mode power supplies
SCHEMATIC DIAGRAM
Vref
VZ
Gnd

1 page




ZHT2431C02 pdf
APPLICATION CIRCUITS
ZHT2431
V+
R1
Vref
R2
Vout
Vout =
1+
R1
R2
Vref
SHUNT REGULATOR
V+
R1
Vref
R2
Vout
Vout = 1 + R1 Vref
R2
HIGHER CURRENT SHUNT REGULATOR
V+ ZSR***
Vout
In Out
Common
R1
Vref
R2
Vout MIN = Vref + Vreg
Vout = 1 + R1 Vref
R2
OUTPUT CONTROL OF A
THREE TERMINAL FIXED REGULATOR
V+
INPUT
VTH = 2.5V
OUTPUT
Von 2V
Voff = V+
SINGLE SUPPLY COMPARATOR
WITH TEMPERATURE
COMPENSATED THRESHOLD
V+
30
0.01µF
R1
Vref
R2
Vout
Vout = 1 + R1 Vref
R2
SERIES REGULATOR
V+
R1A
Vref
R2A
R1B
R2B
Vref OUTPUT
Low limit = 1 + R1B
R2B
Vref
High limit = 1 + R1A
R2A
Vref
OVER VOLTAGE / UNDER VOLTAGE
PROTECTION CIRCUIT

5 Page










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