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ZR431 Datasheet

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

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ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
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.
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)
Pin Assignments
(Top View)
VREF 3
1 GND
VZ 2
SOT23
(Top View)
VZ 1
GND 2
4 GND
VREF 3
SOT223
Pin 4 floating or
connected to pin 2
Applications
Shunt regulator
Series regulator
Voltage monitor
Over voltage/ under voltage protection
Switch mode power supplies
Notes: 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
V  REF
+
ZR431
Document number: DS33255 Rev. 6 - 2
1 of 9
www.diodes.com
GND
October 2011
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

ZR431 Datasheet

ADJUSTABLE PRECISION ZENER SHUNT REGULATOR

No Preview Available !

ZR431
ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Absolute Maximum Ratings (Note 2)
Symbol
Parameter
Rating
Unit
VZ Cathode Voltage
IZ Cathode Current
TA Operating Temperature
TST Storage Temperature
SOT23
PD
Power Dissipation (Notes 3, 4)
SOT223
20
150
-40 to +85
-55 to +125
330
2
V
mA
°C
°C
mW
W
Notes:
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
VZ
IZ
Cathode Voltage
Cathode Current
Parameter
Min
VREF
0.05
Max
20
100
Unit
V
mA
Electrical Characteristics (TA = 25°C unless otherwise specified)
Symbol
Parameter
Test Conditions
Min
Reference voltage (Note 5) 2%
2.45
VREF
1 % IL = 10mA (Fig 1), VZ = VREF
0.5%
2.475
2.487
VDEV
ΔVREF
ΔVZ
IREF
ΔIREF
IZ(MIN)
Deviation of reference input voltage
over temperature
Ratio of the change in reference
voltage to the change in cathode
voltage
Reference input current
Deviation of reference input current
over temperature
Minimum cathode current for
regulation
IL = 10mA, VZ = VREF
TA = Full range (Fig 1)
VZ from VREF to 10V
IZ = 10mA (fig 2)
VZ from 10V to 20V
IZ = 10mA (Fig 2)
R1 = 10k, R2 = O/C, IL = 10mA (Fig 2)
R1 = 10k, R2 = O/C, IL = 10mA
TA = Full range (Fig 2)
VZ = VREF (Fig 1)
IZ(OFF) Off-state current
RZ Dynamic output impedance
VZ = 20V, VREF = 0V (Fig 3)
VZ = VREF (Fig 1), f = 0Hz
Note 5: 0.5% and 1% SOT23 only
Typ.
2.50
2.50
2.50
8.0
-1.85
-1.0
0.12
0.04
35
For definitions of reference voltage temperature coefficient and dynamic output impedance see NOTES following DC TEST CIRCUITS
Max
2.55
2.525
2.513
17
-2.7
-2.0
1.0
0.2
50
0.1
0.75
Unit
V
mV
mV/V
μA
μA
µA
μA
ZR431
Document number: DS33255 Rev. 6 - 2
2 of 9
www.diodes.com
October 2011
© Diodes Incorporated


Part Number ZR431
Description ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Maker Diodes
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ZR431 Datasheet PDF






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