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 AZ431 Adjustable Accurate Reference Source

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The AZ431 is a three-terminal a djustable shunt regulator offering
excellent temperature stability . This device has a typical dynamic output 1. REFERENCE
impedance of 0.2ȍ. The device can be used as a replacement for zener
diodes in many applications. 2. CATHODE

)($785(6 3. ANODE
z The output voltage can be adjusted to 36V
z Low dynamic output impedance, its typical value is 0.2ȍ
z Trapping current capability is 1 to 100mA
z Low output noise voltage
z Fast on -state response
z The effective temperature compensation in the working range of full temperature
z The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/Я

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z Shunt Regulator
z High-Current Shunt Regulator
z Precision Current Limiter

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Cathode Voltage VKA 37 V
Cathode Current Range (Continuous) IKA -100~+150 mA
Reference lnput Current Range Iref 0.05~+10 mA
Power Dissipation PD  300 mW
Thermal Resistance from Junction
RșJA  Я/W
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 Operating
 Junction Temperature Tj 150 Я
Operating Ambient Temperature Range TRSU  0~70 Я
Storage temperature Range Tstg -65~+150 Я













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Parameter Symbol Test conditionV Min Typ Max Unit

Reference Lnput Yoltage (Fig.1) VrefVKA=VREF, IKA=10mA 2.450 2.5 2.550 V
Deviation of reference input Yoltage VKA =VREF, IKA =10mA
ƸVref /ƸT 4.5 17 mV
Rver temperature (note) (Fig.1) Tmin”Ta”Tmax
ƸVKA
Ratio Rf Fhange in Ueference Lnput -1.0 -2.7 mV/V
=10V~VREF
Yoltage to the change in Fathode ƸVref /ƸVKA IKA=10mA
ƸVKA
Yoltage (Fig.2) -0.5 -2.0 mV/V
=36V~ 10V
IKA= 10mA,R1=10Nȍ
Reference Lnput Furrent (Fig.2) lref 1.5 4 ȝA
R2=’
lKA=10mA, R1=10Nȍ
Deviation Of Ueference Lnput Furrent
Ƹlref /ƸT R2=’ 0.4 1.2 ȝA
Rver Iull Wemperature Uange (Fig.2)
Ta=full Temperature
Minimum cathode current for
IKA(min) VKA=VREF 0.45 1.0 mA
Uegulation (Fig.1)
Off-state cathode Current (Fig.3) IKA(OFF) VKA=36V,VREF=0 0.05 1.0 ȝA
VKA=VREF, lKA=1 to 100mA
Dynamic Lmpedance ZKA 0.15 0.5 ȍ
f”1.0NHz
note: TMIN=0Я ,TMAX=+70Я

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 AZ431
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0
IK=10mA
(mV)

Ta=25ć

-4
ƸVref, REFERENCE INPUT VOLTAGE

-8

-12

-16

-20
0 5 10 15 20 25 30 35 40
Test Circuit for VKA=Vref(1+R1/R2)+R1*Iref
VKA, CATHODE VOLTAGE (V)

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700
(nA)

600
Iref, REFERENCE INPUT CURRENT

500

400

300

200

100
IK=10mA
R1=10Kȍ
0
-40 -20 0 20 40 60 80 100
Test Circuit for Iref
Ta, AMBIENT TEMPERATURE (ć)

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50
(nA)

45

40
Ioff, OFF-STATE CATHODE CURRENT

35

30

25

20

15

10

VKA=36V
5
Vref=0V
0
-40 -20 0 20 40 60 80 100
Test Circuit for Ioff
Ta, AMBIENT TEMPERATURE (ć)