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ADJUSTABLE PRECISION ZENER SHUNT REGULATOR
Issue 2 - February 1998 DEVICE DESCRIPTION
The ZH431 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 30mA. The output voltage may be set to any chosen voltage between 2.5 and 36 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.They are also ideal for use in the feedback circuits of off line SMPUs as well as many general purpose regulator and reference applications where initial accuracy and low temperature coefficient are key requirements. Note: ZH431 is not recommended for new designs. Refer to ZR431
ZH431
FEATURES
* * * * * * * * * * * * *
Surface mount SO8, SOT223,SOT23 and SOT89 packages TO92 package 2% and 1% tolerance Maximum temperature coefficient 55 ppm/C Temperature compensated for operation over the full temperature range Programmable output voltage 50A to 30mA current sink capability Low output noise
APPLICATIONS
Shunt regulator Series regulator Voltage monitor Over voltage/ under voltage protection Switch mode power supplies
SCHEMATIC DIAGRAM
VZ V ref
Gnd
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ZH431
ABSOLUTE MAXIMUM RATING
Cathode Voltage (VZ) 40V Cathode Current 50mA Operating Temperature -40 to 85C Storage Temperature -55 to 125C Recommended Operating Conditions Min Max Cathode Voltage Vref 36V Cathode Current 50A 30mA Power Dissipation (Tamb=25C, Tjmax=150C) SOT23 330mW TO92 780mW SOT223 2W SO8 780mW SOT89 1.5W
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated):Tamb=25C
PARAMETER Reference Voltage 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
SYMBOL
VALUE MIN TYP MAX UNITS CONDITIONS IL=10mA (Fig1), VZ=Vref IL=10mA, VZ=Vref Ta=full range (Fig1) VZ from Vref to 10V IZ=10mA (Fig2) VZ from 10V to 36V IZ=10mA (Fig2) R1=10k, R2=O/C, lL=10mA (Fig2) R1=10k, R2=O/C, IL=10mA Ta=full range (Fig2) VZ=Vref (Fig1) VZ=Vref (Fig1), f=0Hz 2.45 2.50 2.55 V 2.475 2.50 2.525 8.0 17 mV
2% Vref 1% Vdev
Vref VZ
-0.7 -0.6
-2.7 -2.0
mV/V mV/V A A
Iref Iref
0.15 1.0 0.06 0.2
IZmin
21
50 0.75
A
Dynamic Output Impedance RZ
Deviation of reference input voltage, Vdev, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, Vref is defined as:
Vmax
Vmin
Vdev = Vmax - Vmin
Vdev x 1000000 Vref (T1-T2) The dynamic output impedance, Rz, is defined as: VZ RZ = 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: R1 R'=Rz (1+ ) R2 Vref (ppm C)=
T2
T1
Temperature
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ZH431
TYPICAL CHARACTERISTICS
200
Vref= Vz Iz= 10mA
5
Change in Reference Voltage (mV)
Reference Current (nA)
180 160 140
0 -5 -10 -15 -20 -25 0 5 10 15 20 25 30 35 40
120 100 -40
-20
0
20
40
60
80
Temperature (C)
Cathode Voltage (V)
Reference Current v Temperature
26
Vref= Vz
Change in Vref v Cathode Voltage
100
1mA
Minimum Cathode Current (uA)
24 22 20 18 16 14 12 -40
Dynamic Impedance (Ohms)
10
Vref=Vz
10mA
1
0.1
-20
0
20
40
60
80
0.01 100
1k
10k
100k
1M
Temperature (C)
Frequency (Hz)
Cathode Current v Temperature
2.52
Iz= 10mA
Dynamic Impedance v Frequency
2.0
2.51
Reference Voltage (V)
Power Dissipation (W)
SOT223
2.50 2.49
1.0
SOT89 S08/T092 SOT23
2.48 2.47 -40
-20
0
20
40
60
80
0 25
50
75
100
Temperature (C)
Ambient Temperature (C)
Reference Voltage v Temperature
Power Dissipation Derating
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ZH431
TYPICAL CHARACTERISTICS
70 60 50
VZ 15k 9F IZ 230
Open Loop Gain (dB)
40
+
30 20 10 0 100
8k25
-
1k
10k
100k
1M
Frequency (Hz)
IZ = 10mA, TA = 25C
Gain v Frequency
Test Circuit for Open Loop Voltage Gain
220
VZ
Input Monitor
3.0
REPETITIVE PULSE
2.0
Voltage Swing (V)
SINGLE PULSE
1.0
Pulse Generator
50
0 5
INPUT
0 0 0.05 0.1 0.15 0.2 0.25
TA = 25C
Time (s)
Pulse Response
Test Circuit for Pulse Response
Input 150 VZ
30 25
IZ
Unstable
Cathode Current (mA)
20
Stable
10k
15 10 5
Stable
0 10p
100p
1000p
0.01
0.1
1
Load Capacitance (F)
Stability Boundary Conditions
Vref < VZ < 40, IZ = 10mA, TA = 25C
Test Circuit for Stability Boundary Conditions
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ZH431
DC TEST CIRCUITS
IL
Input
Fig 1 - Test Circuit for Vz=Vref
Fig 2 - Test Circuit for Vz>Vref
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ZH431
APPLICATION CIRCUITS
V+
Vout
V+
Vout
R1 Vref Vref R2
R1
R2
Vout =
1+
R1 R2
Vref
Vout =
1+
R1 R2
Vref
SHUNT REGULATOR
HIGHER CURRENT SHUNT REGULATOR
V+ ZSR*** In Common Out
V+
Vout
30
R1 0.01F Vref R1 R2 Vref R2 Vout
Vout MIN = Vref + Vreg Vout = 1+ R1 R2 OUTPUT CONTROL OF A THREE TERMINAL FIXED REGULATOR Vref Vout = 1+ R1 R2 SERIES REGULATOR Vref
V+
V+
OUTPUT INPUT V on V TH = 2.5V 2V
R1A
R1B Vref OUTPUT
Vref R2A R2B
V off = V+
Low limit =
1+
R1B R2B
Vref
High limit =
1+
R1A R2A
Vref
SINGLE SUPPLY COMPARATOR WITH TEMPERATURE COMPENSATED THRESHOLD
OVER VOLTAGE / UNDER VOLTAGE PROTECTION CIRCUIT
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ZH431
CONNECTION DIAGRAMS
SO8 Package Suffix - N8 SOT223 Package Suffix - G
Top View
Top View - Pin 4 floating or connected to pin 2
SOT23 Package Suffix - F
TO92 Package Suffix - C
Top View
Bottom View
ORDERING INFORMATION
Part Number ZH431C01 ZH431C02 ZH431G01 ZH431G02 ZH431F01 ZH431F02 ZH431Z01 ZH431Z02 ZH431N801 ZH431N802 Package TO92 TO92 SOT223 SOT223 SOT23 SOT23 SOT89 SOT89 SO8 SO8 Tol. % 1.0 2.0 1.0 2.0 1.0 2.0 1.0 2.0 1.0 2.0 Part Mark ZH43101 ZH43102 ZH43101 ZH43102 43H 43G 43H 43G ZH43101 ZH43102
SOT89
Package Suffix - Z
Top View - Pin 4 floating or connected to pin 2
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