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| SEMICONDUCTOR AS432 Reference 1.24V Precision Adjustable Shunt Description The AS432 is a three terminal adjustable shunt regulator utilizing an accurate 1.24V bandgap reference. The AS432 is functionally similar to an AS431 except for its lower reference voltage, making it usable in a wide variety of low voltage applications. Because of its robust bipolar technology, the AS432 handles a wide range of current, and holds off more than 18V so its use is not limited to low power, low voltage systems. Significant care has been taken to provide adequate AC bandwidth to allow the AS432 as an amplifier in control systems and power electronics. Features * * * * * * Temperature-compensated: 50 ppm/C 0.25% to 2.0% bandgap offered Internal amplifier with 150 mA capability Multiple temperature ranges Low frequency dynamic output impedance: < 150 m Low output noise Top view Pin Configuration -- TO-92 (LP) CATHODE CATHODE ANODE ANODE REFERENCE ANODE N/C 2 3 4 1 8L SOIC (8D) 8 7 6 5 REFERENCE ANODE ANODE N/C 5L SOT-23 (5VS) N/C N/C CATHODE REFERENCE ANODE SOT-89 (S) CATHODE ANODE REFERENCE ANODE 3L SOT-23 (3VS) CATHODE REFERENCE Ordering Information AS432 A C 8D N Circuit Type: 1.24V Precision Adjustable Shunt Regulator Bandgap Tolerance: A = 0.25% C = 0.5% D = 1.0% E = 2.0% Temperature Range: A = 0C to 70C B = 0C to 105C C = -40C to 85C F = -55C to 125C Packaging Option: A = Ammo Pack B = Bulk T = Tube M = Tape and Reel (7" Reel Dia, SOT-23 Only) N = Tape and Reel (13" Reel Dia) Package Style: 8D = 8 Pin, Plastic SOIC 5VS = 5 Pin, SOT-23 3VS = 3 Pin, SOT-23 = SOT-89 S LP = TO-92 www.ptcc.com.tw 25 AS432 Functional Block Diagram 1.24V Precision Adjustable Shunt Reference CATHODE (K) REFERENCE (R) + - + - 1.24 V ANODE (A) Absolute Maximum Ratings Parameter Cathode-Anode Reverse Breakdown Anode-Cathode Forward Current Operating Cathode Current Reference Input Current Continuous Power at 25C TO-92 8L SOIC SOT-89 SOT-23/3L/5L Junction Temperature Storage Temperature Lead Temperature (Soldering 10 sec.) TJ TSTG TL Symbol VKA IAK IKA IREF PD 775 750 1000 200 150 -65 to 150 300 mW mW mW mW C C C Rating 18 1 100 1 Units V A mA mA Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IK Rating VREF to 18 10 Unit V mA Typical Thermal Resistances Package TO-92 SOIC SOT-89 JA 160C/W 175C/W 110C/W JC 80C/W 45C/W 8C/W 150C/W Typical Derating 6.3 mW/C 5.7 mW/C 9.1 mW/C 1.7 mW/C SOT-23/5L 575C/W www.ptcc.com.tw 26 AS432 Typical Performance Curves 1.24V Precision Adjustable Shunt Reference * Calculating Average Temperature Coefficient (TC) ppm mV VREF (mV) TA VREF 2000 0.2 -5 * TC in %/C = VREF at 25C TA VREF -10 0 15 30 45 60 75 Temperature (C) 90 105 * TC in ppm/C = VREF at 25C TA % 0 0 T VREF 0 * TC in mV/C = X 100 X 106 0.021 mV/C 0.008%/C 8.0 ppm/C Test Circuits VIN VKA = VREF VIN VKA VIN VKA IREF IK IK R1 IREF (VREF) R2 IK (OFF) Figure 1a. Test Circuit 1 Figure 1b. Test Circuit 2 Figure 1c. Test Circuit 3 www.ptcc.com.tw 28 1.24V Precision Adjustable Shunt Reference Typical Performance Curves AS432 Low Current Operating Characteristics 900 800 700 IK - Cathode Current (mA) IK - Cathode Current (A) 600 500 400 300 200 100 0 -55C -100 -200 -0.5 0 0.5 VKA - Cathode Voltage (V) 1.0 25C 1.5 -75 -100 -2 125C 175 150 125 100 75 50 25 0 -25 -50 High Current Operating Characteristics VKA = VREF Temperature Range -55 to 125C -1 0 VKA - Cathode Voltage (V) 1 2 Figure 2 Figure 3 Off State Leakage 100 VKA = 15 V VREF = 0 V IZ off - Off State Cathode Current (nA) VREF - Reference Voltage (V) 10 1.27 1.26 1.25 1.24 Reference Voltage vs Ambient Temperature VKA = VREF IK = 10 mA VREF = 1.240 V at 25C 1.23 1.22 1.21 1.20 1 0.1 0.01 -60 -30 0 30 60 90 120 1.19 -60 -30 0 30 60 90 120 TA - Ambient Temperature (C) TA - Ambient Temperature (C) Figure 4 Figure 5 www.ptcc.com.tw 29 AS432 Typical Performance Curves 1.24V Precision Adjustable Shunt Reference Reference Input Current 2.4 R1 = 10 k R2 = IK = 10 mA 2.3 0 Reference Voltage Line Regulation VREF - Change in Reference Voltage (mV) IREF - Reference Input Current (A) -10 -40C -20 25C -30 75C 2.2 2.1 -40 IK = 10 mA Temperature Range: -55 to 125C 125C 2.0 -60 -50 -30 0 30 60 90 120 TA - Ambient Temperature (C) 0 3 6 9 12 15 18 VKA - Cathode Voltage (V) Figure 6 Figure 7 Noise Voltage 70 60 VKA = VREF IK = 10 mA TA = 25C ZKA - Dynamic Impedance (m) 30 40 Low Frequency Dynamic Output Impedance VKA = VREF VKA = 1 to 100 mA f 1kHz 50 Noise Voltage nV/Hz 40 30 20 10 0 10 20 10 100 1k f - Frequency (Hz) 10 k 100 k 0 -60 -30 0 30 60 90 120 TA - Free Air Temperature (C) Figure 8 Figure 9 www.ptcc.com.tw 30 1.24V Precision Adjustable Shunt Reference Typical Performance Curves AS432 Dynamic Output Impedance 100 TA = 25C IK = 1 to 100 mA ZKA - Dynamic Impedance () 10 1.0 0.1 0.01 1k 10 k 100 k f - Frequency (Hz) 1M 10 M Figure 10 Small Signal Voltage Gain vs. Frequency 80 Temperature Range: -55 to 125C 70 AV - Small Signal Voltage Gain (dB) 60 50 40 8.25 k 30 20 10 0 1k GND IK = 10 mA 9 F 15 k IK OUT 230 10 k 100 k f - Frequency (Hz) 1M 10 M Figure 11 www.ptcc.com.tw 31 AS432 Typical Performance Curves 1.24V Precision Adjustable Shunt Reference Pulse Response 4 INPUT MONITOR Input and Output Votages (V) 3 Input 220 OUT 2 Output 1 fP = 100 kHz 50 0 GND -1 0 1 2 3 4 5678 t - Time (s) 9 10 11 12 Figure 12 www.ptcc.com.tw 32 |
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