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| Semiconductor A431X Programmable Voltage Reference Description The A431 series are 3-terminal precision shunt regulators that are programmable over a wide voltage range of 2.495V to 16V with 0.5%, 1.0% tolerance. The A431 series have a low dynamic impedance of 0.15. These features make the A431 series an excellent replacement for zener diodes in numerous applications circuits that require a precision reference voltage. Features * Programmable output voltage from 2.495V to 16V * Voltage reference tolerance : 0.5%, 1.0% * Cathode current capability of 1mA to 100mA Ordering Information Type NO. A431X Marking A431 : Grade => A:1% , B:0.5% Package Code TO-92 Outline Dimensions ( Unit : mm ) 4.40~4.80 4.40~4.80 Symbol 0.50 Max. 13.50~14.50 Functional block diagram Cathode(K) Reference(R) + 1.27 Typ. 1.27 Typ. - V REF =2.495V 1 3.40~3.60 2 3 Anode(A) PIN Connections 1. Reference 2. Anode 3. Cathode 0.45 Max. KSD-I0A003-000 1 A431X Absolute maximum ratings Characteristic Cathode to Anode voltage Cathode current Reference input current Power Dissipation Junction Temperature Operating temperature range Storage temperature range [Ta=25] Symbol VKA IK Iref PD TJ Topr Tstg Rating 18 150 10 625 150 -40 ~ +85 -55 ~ +150 Unit V mA mA mW Recommended operating conditions Characteristic Cathode to Anode voltage Cathode current Symbol VKA IK Rating Min. Vref 1 Max. 16 100 Unit V mA Electrical Characteristics (Ta=25, unless otherwise noted.) Characteristic Reference voltage (Fig.1) Reference input voltage deviation over temperature (Fig.1, Note1,2) Ratio of delta reference input voltage to delta cathode voltage (Fig.2) Reference current (Fig.2) Reference input current deviation over temperature (Fig.2, Note 1,2) Minimum cathode current for regulation Off-state cathode current (Fig.3) Dynamic impedance (Fig.1, Note3) Symbol Vref Vref Vref VKA Iref Iref IK(MIN) IK(off) Condition VKA=Vref, IK=10mA VKA=Vref , IK=10mA @ 0C Ta 70C IK=10mA Vref VKA 16V IK=10mA R1=10K, R2= IK=10mA R1=10K, R2= @ 0C Ta 70C VKA=Vref VKA=16V, Vref=0V VKA=Vref, f 1.0KHz 1.0mA IK 100mA Vref=Vref(16V) -Vref VKA=VKA(16V)-Vref Min. Typ. Max. A431B A431A 2.482 2.470 2.495 2.508 2.520 30 -2.7 4.0 2.5 1.0 1000 Unit V 7 -1.0 1.8 0.4 0.35 2.7 mV mV/V m nA ZKA - 0.15 0.5 KSD-I0A003-000 2 A431X Fig. 1 Test circuit for VKA=Vref Fig. 2 Test circuit for VKA>Vref Fig. 3 Test circuit for IK(off) Input IK VKA Input R1 R2 Vref IK Iref VKA Input VKA IK(off) V KA = V ref x (1 + R1 ) + I ref x R 1 R2 Note. 1. Ambient temperature range: TLOW = 0, THigh = 70 2. The deviation parameters Vref and Iref are defined as the difference between the maximum value and minimum value obtained over the full operating ambient temperature range that applied. Vref = Vref Max - Vref Min Ta = T2 - T1 Ambient Temperature The average temperature coefficient of the reference input voltage, Vref is defined as: V ref x 10 6 ) ppm V ref (T a = 25) V ref ( )= T a ( Vref can be positive or negative depending on whether Vref Min or Vref Max occurs at the lower ambient temperature, refer to Fig. 8 Example : Vref = 30mV and the slope is positive, Vref @ 25 = 2.495V Ta = 70 0.03 ( ) x 10 6 ppm 2.495 Vref ( )= = 171ppm / 70 3. The dynamic impedance ZKA is defined as: KA = VKA I K When the device is operating with two external resistors, R1 and R2, (refer to Fig.2) the total dynamic impedance of the circuit is given by: KA ' = KA x (1 + R1 ) R2 KSD-I0A003-000 3 A431X Electrical Characteristics Curves (Continue) Fig.4 IK vs VKA (1) 150 Fig.5 IK vs VKA (2) 4.0 125 100 75 50 25 0 -25 -50 -75 Cathode current IK [mA] Cathode current IK[mA] VKA=Vref Ta=25C VKA=Vref, Ta=25C 3.0 2.0 1.0 0.0 -0.2 -1 -100 -2 -1 0 1 2 3 0 1 2 3 Cathode Voltage VKA [V] Fig.6 IK(off) vs VKA Ratio of delta reference input voltage to delta Cathode Voltage VKA [V] Fig.7 Vref/VKA vs Ta cathode voltag Vref /VKA [mV/V] 0.0 -0.1 Off-state cathode current IK(off) [A] 2.0 Vref=0V, Ta=25C 1.5 -0.2 1.0 -0.3 I 0.5 0.0 0 4 8 12 16 20 -0.4 -0.5 -15 Vref VKA 16V IK=10mA 0 15 30 45 60 75 Cathode Voltage VKA [V] Fig.8 Vref vs Ta 2.545 1000 Ambient Temperature Ta [C] Fig.9 PD vs Ta Reference input voltage Vref [V] VKA=Vref , Iref=10mA 2.525 Power dissipation PD [mW] Vref(max) Vref(typ) 800 2.505 600 2.485 Vref(min) 400 2.465 200 0 2.445 -15 0 15 30 45 60 75 0 25 50 75 100 125 150 Ambient Temperature Ta [C] Ambient Temperature Ta [C] KSD-I0A003-000 4 A431X Electrical Characteristics Curves Fig.10 Pulse Response 7 Input and output voltage - V 6 5 4 3 2 1 0 -1 0 2 4 Ta=25C Input B 220 Output A Output f=10KHz 50 GND Fig.11 Test circuit for Fig. 10 6 8 10 t - Time [s ] Fig.12 Pulse Response (Magnify A of Fig.10) 7 Fig.13 Pulse Response (Magnify B of Fig.10) 7 Input and output voltage - V 6 5 4 3 2 1 0 -1 0 Input and output voltage - V Ta=25C Input 6 5 4 3 2 1 0 -1 0 Ta=25C Input Output Output 1 2 3 4 5 1 2 3 4 5 t - Time [s ] Fig.14 Stability Boundary Conditions t - Time [s ] Output R1 IK CL R2 GND 0 Unstable Regions A B VKA Vref 10V R1 [K] 0 10 R2 [K] 3.325 Fig.15 Test circuit for Fig. 14 KSD-I0A003-000 5 A431X The AUK Corp. products are intended for the use as components in general electronic equipment (Office and communication equipment, measuring equipment, home appliance, etc.). Please make sure that you consult with us before you use these AUK Corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to the welfare of human life(atomic energy control, airplane, spaceship, transportation, combustion control, all types of safety device, etc.). AUK Corp. cannot accept liability to any damage which may occur in case these AUK Corp. products were used in the mentioned equipments without prior consultation with AUK Corp.. Specifications mentioned in this publication are subject to change without notice. KSD-I0A003-000 6 |
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