@vic AV431LT1 Adjustable Reference Source FEATURES The output voltage can be adjusted to 36V Low dynamic output impedance ,its typical value is 0.2Ω Trapping current capability is 1 to 100mA The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/℃ The effective temperature compensation in the working range of full temperature Low output noise voltage Fast on -state response 0.5% and 1% precision ABSOLUTE MAXIMUM RATINGS （ Operating temperature range applies unless otherwise specified） Parameter SYMBOL VALUE UNITS Cathode Voltage Cathode Current Range (Continuous) Reference lnput Current Range Power Dissipation VKA IKA Iref PD 37 -100-+150 0.05-+10 770 V mA mA mW Operating temperature Storage temperature Range Topr Tstg 0-70 -65-+150℃ ℃ ℃ ELECTRICAL CHARACTERISTICS（Tamb=25℃ unless otherwise specified） Parameter Symbol Reference lnput Voltage Deviation of reference input Voltage Over temperature (note) Ratio Of Change in Reference lnput Voltage to the change in Cathode Voltage Test conditions Vref VKA=VREF, IKA=10mA VKA =VREF, IKA =10mA Tmin Ta Tmax △Vref/△T △Vref/△VKA Reference lnput Current lref △VKA =10V〜 VREF △VKA =36V〜 10V MIN TYP MAX 2.440 2.495 2.550 4.5 17 UNIT V mV -1.0 -2.7 -0.5 -2.0 IKA= 10mA,R1=10KΩ R2=∞ 1.5 4 μA IKA=10m A m V/V Deviation Of Reference lnput Current Over Full Temperature Range △lref/△T lKA=10mA, R1=10KΩ R2=∞ TA=full Temperature 0.4 1.2 μA Minimum cathode current for Regulation IKA(min) VKA=VREF 0.45 1.0 mA Off-state cathode Current IKA(OFF) 0.05 1.0 μA Dynamic impedance ZKA VKA=36V ,VREF=0 VKA=VREF,lKA=1 to 100mA f 1.0KHz 0.15 0.5 Ω Note:TMIN=0℃ ,TMAX=+70℃ Copyright © Avic Electronics Corp. 1 Website: http://www.avictek.com @vic AV431LT1 3.0 2600 2580 VKA = Vref IK = 10mA 2560 2540 Vref = 2550mV 2520 2500 Vref = 2495mV Iref–REFERENCE INPUT CURRENT – (µA) Vref–REFERENCE INPUT VOLTAGE – (mV) TYPICAL APPLICATIONS 2480 2460 Vref = 2440mV 2440 2420 2400 R1 = 10k 2.5 R2 = ∞ K = 10mA 2.0 1.5 1.0 0.5 0 -50 -25 0 25 50 100 75 -75 125 -50 C – TEMPERATURE – (°C) Ioff–OFF-STATE CATHODE CURRENT – (nA) CATHODE CURRENT – (mA) 50 25 0 -1 0 2 1 90 80 70 40 30 20 10 0 -75 -50 d(Vref)/d(Vka) – (mV/V) IK–CATHODE CURRENT – ( µ A) 0 25 50 75 100 125 Figure 4.Off-State Cathode Current vs. Temperature 200 0 -200 1 -25 C – TEMPERATURE – (°C) 400 0 100 125 50 3 VKA = Vref Tamb = -1 70 60 Figure 3.Cathode Current vs. Cathode Voltage 600 50 VKA = 36V Vref = 0V CATHODE VOLTAGE – (V) 800 25 Figure 2.Reference Input Current vs. Temperature 150 125 VKA = Vref Tamb = 25°C 100 75 -2 0 C – TEMPERATURE – (°C) Figure 1.Reference Input Voltage vs. Temperature -25 -50 -75 -100 -25 2 3 VKA = 3V TO 36V -0.4 -0.5 -0.6 -0.7 -0.8 -0.9 -1 -75 VKA-CATHODE VOLTAGE – (V) -50 -25 0 25 50 75 100 125 C – TEMPERATURE – (°C) Figure 5.Cathode Current vs. Cathode Voltage Copyright © Avic Electronics Corp. 0 -0.1 -0.2 -0.3 Figure 6.Ratio of Delta Reference Voltage to Delta Cathode Voltage over Temperature 2 Website: http://www.avictek.com INPUT AND OUTPUT VOLTAGE -V @vic AV431LT1 7 6 5 220Ω 4 OUTPUT 3 PULSE GENERATOR F=100KHz 2 50Ω 1 GND 0 0 1 2 3 4 5 6 7 Test Circuit t – TIME –µS Figure 7. Pulse Response |ZKA| – REFERENCE IMPEDANCE –Ω 100 IK=10mA Tamb=25°C 1KΩ OUTPUT 10 IK 50Ω 1 GND 0.1 1K 10K 100K 1M 10M Test Circuit for Reference Impedance f – FREQUENCY – Hz Av – VOLTAGE AMPLIFICATION – dB Figure 8.Reference Impedance vs. Frequency 70 I =10mA K 60 Tamb=25°C OUTPUT 50 IK 15KΩ 40 230Ω 9µF 30 20 8.25KΩ GND 10 0 1K 10K 100K 1M 10M Test Circuit for Voltage Amplification FREQUENCY IN Hz Figure 9.Small-Signal Voltage Amplification vs. Frequency Copyright © Avic Electronics Corp. 3 Website: http://www.avictek.com @vic AV431LT1 TYPICAL APPLICATIONS Figure 10.Shunt Regulator Figure 11.Series Pass Regulator Figure 13.Constant Current Source Figure 12.Single-Supply Comparator with Temperature-Compensated Threshold Figure 15.Constant Current Sink Figure 14.High Current Shunt Copyright © Avic Electronics Corp. 4 Website: http://www.avictek.com