Advanced Power Electronics Corp. AP431A ADJUSTABLE PRECISION SHUNT REGULATOR Features • • • • • • • • • • Description Precision reference voltage AP431A : 2.495V ± 0.5% Sink current capability: 200mA Minimum cathode current for regulation: 300μA o Equivalent full-range temp coefficient: 30 ppm/ C Fast turn-on response Low dynamic output impedance: 0.2Ω Programmable output voltage to 36V Low output noise. Packages: TO-92,SOT-23, SOT-25 and SOP-8 SOT-89 RoHS Compliant & Halogen Free Product The AP431A are 3-terminal adjustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V(VREF) up to 36V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.2Ω. Active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for Zener diodes in many applications. The precise (+/-) 1% Reference voltage tolerance of the AP431A make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it. Ordering Information A P 4 3 1 A X Package - X Reference Voltage Tolerance : A : +/- 0.5% B : +/- 1% T : TO-92 N/NR : SOT-23 Y : SOT-25 M : SOP-8 G: SOT-89 Typical Application Circuit VIN VOUT + R1 Cin + Cout AP431A AP431 R2 VOUT = (1+R1/R2)VREF Precision Regulator www.a-power.com.tw 1 20130401V6.2 Advanced Power Electronics Corp. AP431A Symbol Block Diagram Cathode (C) REF (R) + Cathode (C) VREF REF (R) Anode (A) Anode (A) Pin Configuration Order Number Pin Configuration ( Top View ) 3 AP431AT ( TO-92 ) Rthja=160oC/W Cathode 2 Anode 1 REF AP431AN ( SOT-23 ) Pin Configuration ( Top View ) Cathode Cathode 2 Anode 3 1 Rthja=500oC/W Rthjl=60oC/W REF Rthjc=180oC/W Cathode AP431AM ( SO-8 ) 8 REF 7 Anode 3 6 Anode 4 5 NC 1 Anode 2 Anode NC Rthja=208oC/W Rthjc=50oC/W AP431AY ( SOT-23-5L ) NC 1 NC 2 Cathode o Rthja=500 C/W 5 Anode 4 REF 1 3 Rthjc=180oC/W 3 AP431AG ( SOT-89 ) Rthja=250oC/W Cathode Anode 2 1 REF AP431AY5 ( SOT-23-5L ) REF 1 Anode 12 Cathode 3 5 NC 4 NC Rthja=500oC/W 2 o Rthjc=180oC/W Rthjc=110 C/W AP431ANR ( SOT-23 ) Order Number 2 Anode REF 3 1 Cathode Rthja=500oC/W Rthjc=180oC/W www.a-power.com.tw 2 Advanced Power Electronics Corp. AP431A Absolute Maximum Ratings Cathode Voltage ………………………………......….........................…...……………………………...……….36V Continuous Cathode Current ………………………….…….............…................…………….... -10mA ~ 250mA Reference Input Current Range ……………..………..............…….................................………….…....... 10mA o o Operating Temperature Range ………….…………..…….…….....………………...........………......-40 C ~ 85 C o Lead Temperature………………………….………….…….…………....…………………….........…............ 260 C o o Storage Temperature ……………………………......…....….............………………..……...…....... -65 C ~ 150 C Power Dissipation (Notes 1. 2) TO-92 Package ….…………..………………………....………….....… 0.78W SOT-23 Package .…...…………..…………….......…………………… 0.25W SOT-25 Package……………………...…………….………….………..0.25W SOP-8 Package……………….………………………………………… 0.6W o SOP-89 Package............................................................................... 0.5W Note 1: TJ, max =150 C o Note 2: Ratings apply to ambient temperature at 25 C Electrical Characteristics (Ta=25oC , unless otherwise specified.) PARAMETER TEST CONDITIONS VKA = VREF, -B Reference voltage I KA = 10mA (Fig.1) -A Deviation of Reference input voltage VKA = VREF, IKA = 10mA, over temperature (Note 3) Ta = Full range (Fig.1) Ratio of the change in Reference VKA = 10V voltage to the change in Cathode IKA = 10mA (Fig.2) ~VREF voltage VKA= 36V ~10V R1 = 10KΩ,R2 = ∞ IKA= 10mA Reference input current (Fig.2) Deviation of Reference input current R1 = 10KΩ,R2 = ∞ IKA = 10mA over temperature Ta = Full range (Fig.2) Minimum Cathode current for VKA = VREF (Fig.1) regulation Off-state current VKA = 36V, VREF = 0V (Fig.3) V KA = VREF Dynamic output impedance (Note 4) Frequency ≤ 1KHz (Fig.1) SYMBOL MIN. TYP. MAX. UNIT VREF 2.470 2.495 2.520 2.482 2.507 V VREF 8.0 mV ∆VREF -1.4 ∆VKA -1 -2 mV/V IREF 1.4 3.5 µA αIREF 0.4 1.2 µA IKA(MIN) 0.19 0.5 mA IKA(OFF) 0.1 1.0 µA Z KA 0.2 0.5 Ω 20 -2.0 mV/V VMAX VDEV = VMAX - VMIN VMIN TI www.a-power.com.tw TEMPERATURE T2 3 Advanced Power Electronics Corp. AP431A Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference over the full temperature range. The average temperature coefficient of the reference input voltage αVREF is defined as: VDEV ) ⋅ 10 6 VREF (25°C) ……………………..……………….. ( ppm ) = °C T2 − T1 ( α VREF Where: T2 – T1 = full temperature change. αVREF can be positive or negative depending on whether the slope is positive or negative. Note 4. The dynamic output impedance, RZ, is defined as: Z KA = ∆ VKA ∆ IKA When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output impedance of the overall circuit, is defined as: ' Z KA = Test Circuits ∆v ≈ Z KA ∆i Input (1 + R1 ) R2 IN VKA IKA IKA VKA R1 VREF IN R2 VKA IREF VREF IZ(OFF) Note:VKA=VREF(1+R1/R2)+IREF× R1 Fig1. Test Circuit for V KA= VREF www.a-power.com.tw Fig2. Test circuit for V KA＞VREF Fig3. Test Circuit for off-state Current 4 Advanced Power Electronics Corp. AP431A Typical Performance Characteristics Cathode current Vs Cathode Voltage Cathode current (uA) Vs Cathode Voltage 600 VKA=Vref Ta=25oC Cathode current(uA) Cathode current(mA) 100 0 -100 0.5 -0.5 Cathode Voltage(v) -1.5 1.5 2500 Reference Voltage(mV) 200 0 -0.5 0 0.5 1.5 1 Cathode Voltage(v) 2 2.5 Reference input current Vs free Temperature Reference input current (uA) Reference Voltage Vs Free-Air Temperature 400 -200 -1 2.5 VKA=Vref Ta=25oC 2495 2490 2485 2480 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 Free-Air Tempeture (oC) 2 1.8 R1=10K IKA=10mA 1.6 1.4 1.2 1 -50 -25 0 25 50 75 Free-Air Temperature(oC) 100 125 Change in Reference Voltage (mv) Change in Reference Voltage vs Cathode Voltage 0 -2 IKA=10mA Ta=25oC -4 -6 -8 -10 -12 0 5 www.a-power.com.tw 10 15 20 Cathode Voltage (V) 25 30 5 Advanced Power Electronics Corp. AP431A Typical Performance Characteristics(Continued) SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY IKA=10mA TA=25oC 50 Output IKA 15KΩ 40 + 9µF 30 232Ω + - AV-Small Signal Voltage Amplification (dB) 60 - 8.25KΩ GND 20 TEST CIRCUIT FOR VOLTAGE AMPLIFICATION 10 0 1K 10K 100K f-Frequency-Hz 1M 10M REFERENCE IMPEDANCE vs. FREQUENCY ∣ZKA∣—Reference Impedance —Ω 100 IKA=10mA TA=25oC 1KΩ Output I KA 10 50Ω + GND 1 TEST CIRCUIT FOR REFERENCE IMPEDANCE 0.1 1K 10K 100K 1M 10M f-Frequency-Hz www.a-power.com.tw 6 Advanced Power Electronics Corp. AP431A PULSE RESPONSE 6 TA=25oC Input Input and Output Voltage-V 5 220Ω 4 Pulse Generator f=100kHz 3 Output 50Ω Output GND 2 TEST CIRCUIT FOR PULSE RESPONSE 1 0 -1 0 1 2 3 4 5 6 7 t-Time-µ S STABILITY BOUNDARY CONDITIONS † 100 90 IKA-Cathode Current-mA 80 150Ω TA=25 oC A VKA=Vref I KA B VKA=5V C VKA=10V D VKA=15V B Stable 70 60 - VBATT C Stable 50 CL + TEST CIRCUIT FOR CURVE A A 40 30 D I KA 20 10 CL 0 0.001 R2 0.01 0.1 1 C L-Load Capacitance-µF 10 The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, R2 and V+ were adjusted to establish the initial V KA and I KA conditions with C L =0.V BATT and CL were then adjusted to determine the ranges of stability. www.a-power.com.tw 150Ω R1=10KΩ + - VBATT TEST CIRCUIT FOR CURVE B, C, AND D 7 Advanced Power Electronics Corp. AP431A Application Examples VIN VIN RCL R R1A VIN R1B ON R2A R2B + OFF LED on when Low Limit＜VIN＜High Limit Low Limit ≈ VREF (1+R1B/R2B) High Limit ≈ VREF (1+R1A/R2A) V IN Delay = RC x ln( ) VIN -VREF Fig.5 Delay Timer Fig.4 Voltage Monitor VIN IOUT IOUT VIN IOUT = VREF / RCL Fig.6 Current Limiter or Current Source VOUT VIN R1 R1 R2 R2 RS LIMIT VOUT = (1 + R1/R2) x VREF IOUT = VREF / RS Fig.7 Constant-Current Sink VOUT PUSE Fig.8 Higher-Current Shunt Regulator (1 + R1/R2) x VREF Fig.9 Crow Bar VIN R1A R1B + R2A Low Limit High Limit R2B Output ON when Low Limint < VIN< High Limit VBE VREF (1 + R1B/R2B) +VBE VREF(1 + R1A/R2A) Fig.10 Over-Voltage / Under-Voltage Protection Circuit www.a-power.com.tw 8 Advanced Power Electronics Corp. AP431A MARKING INFORMATION SO-8 Part Number Package Code 431AM YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence SOT-23-5L R6&XX Part Number : AP431AY : R6 AP431AY5 : R65 ID Code : Internal SOT-23 R6&XX Part Number : AP431AN : R6 AP431ANR : R6R ID Code : Internal SOT-89 Part Number 431A YWWS Date Code (YWWS) Y:Year WW：Week S：Sequence 9 Advanced Power Electronics Corp. AP431A MARKING INFORMATION TO-92 Part Number 431A YWWS Date Code (YWWS) Y:Year WW：Week S：Sequence 10