www.fairchildsemi.com KA431/KA431A/KA431L Programmable Shunt Regulator Features Description • • • • The KA431/KA431A/KA431L are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2Ω. Active output circuitry provides a very sharp turn on characteristic, making these devices excellent replacement for zener diodes in many applications. Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.2Ω Typical Sink Current Capability of 1.0 to 100mA Equivalent Full-Range Temperature Coefficient of 50ppm/°C Typical • Temperature Compensated for Operation Over Full Rated Operating Temperature Range • Low Output Noise Voltage • Fast Turn-on Response TO-92 1 1. Ref 2. Anode 3. Cathode 8-DIP 8-SOP 1 1 1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref 1.Cathode 2.3.6.7.Anode 4.5.NC 8.Ref Internal Block Diagram CATHODE + REFERENCE 2.5 Vref ANODE CATHODE (K) REFERENCE (R) ANODE(A) Rev. 1.0.9 ©2011 Fairchild Semiconductor Corporation KA431/KA431A/KA431L Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Symbol Value Unit Cathode Voltage VKA 37 V Cathode Current Range (Continuous) IKA -100 ~ +150 mA Reference Input Current Range IREF -0.05 ~ +10 mA PD 770 1000 mW mW TOPR -25 ~ +85 °C TJ 150 °C TSTG -65 ~ +150 °C Power Dissipation D, Z Suffix Package DIP Package Operating Temperature Range Junction Temperature Storage Temperature Range Recommended Operating Conditions Parameter 2 Symbol Min. Typ. Max. Unit Cathode Voltage VKA VREF - 36 V Cathode Current IKA 1.0 - 100 mA KA431/KA431A/KA431L Electrical Characteristics (TA = +25°C, unless otherwise specified) Parameter Symbol Reference Input Voltage VREF Deviation of Reference Input Voltage OverTemperature ΔVREF/ ΔT Conditions VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA TMIN≤TA≤TMAX Min. KA431 KA431A KA431L Typ. Max. Min. Typ. Max. Min. Typ. 2.450 2.500 Max. 2.550 2.470 2.495 2.520 2.482 2.495 2.508 - 4.5 17 - 4.5 17 - 4.5 17 ΔVKA=10 V-VREF - -1.0 - 2.7 - -1.0 - 2.7 - -1.0 -2.7 ΔVKA=36 V-10V - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 Unit V mV Ratio of Change in Reference ΔVREF/ Input Voltage to the Change in ΔVKA Cathode Voltage IKA =10mA Reference Input Current IKA=10mA, R1=10kΩ,R2=∞ - 1.5 4 - 1.5 4 - 1.5 4 μA Deviation of Reference Input Current Over Full Temperature Range IKA=10mA, R1=10kΩ,R2=∞ ΔIREF/ΔT TA =Full Range - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 μA Minimum Cathode Current for Regulation IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 mA Off - Stage Cathode Current IKA(OFF) VKA=36V, VREF=0 - 0.05 1.0 - 0.05 1.0 - 0.05 1.0 μA VKA=VREF, IKA=1 to 100mA f ≥1.0kHz - 0.15 0.5 - 0.15 0.5 - 0.15 0.5 Ω Dynamic Impedance IREF ZKA mV/V • TMIN = -25°C, TMAX = +85°C 3 KA431/KA431A/KA431L Test Circuits Figure 1. Test Circuit for VKA=VREF Figure 3. Test Circuit for lKA(OFF) 4 Figure 2. Test Circuit for VKA≥VREF KA431/KA431A/KA431L Typical Performance Characteristics Figure 4. Cathode Current vs. Cathode Voltage Figure 5. Cathode Current vs. Cathode Voltage Figure 6. Change In Reference Input Voltage vs. Cathode Voltage Figure7. Dynamic Impedance Frequency Figure 8. Small Signal Voltage Amplification vs. Frequency Figure 9. Pulse Response 5 KA431/KA431A/KA431L Typical Performance Characteristics (Continued) 140 A IK, CATHODE CURRENT(mA) 120 100 A VKA = Vref B VKA = 5.0 V @ IK = 10mA C VKA = 10 V @ IK = 10mA D VKA = 15 V @ IK = 10mA B C o TA = 25 C 80 stable stable 60 40 D 20 0 100p 1n 10n 100n 1ٛ CL, LOAD CAPACITANCE Figure 10. Stability Boundary Conditions 6 10ٛ KA431/KA431A/KA431L Typical Application R1 V O = ⎛ 1 + -------⎞ V ref ⎝ R 2⎠ Figure 11. Shunt Regulator R1 V O = V ref ⎛⎝ 1 + -------⎞⎠ R2 R1 V O = ⎛ 1 + -------⎞ V ref ⎝ R 2⎠ Figure 12. Output Control for Three--Te r minal Fixed Regulator Figure 13. High Current Shunt Regulator Figure 14. Current Limit or Current Source Figure 15. Constant-Current Sink 7 KA431/KA431A/KA431L Mechanical Dimensions Package Dimensions in millimeters TO-92 Bulk Type +0.25 4.58 ±0.20 4.58 –0.15 14.47 ±0.40 0.46 ±0.10 1.27TYP [1.27 ±0.20] 1.27TYP [1.27 ±0.20] 8 (0.25) +0.10 0.38 –0.05 1.02 ±0.10 3.86MAX 3.60 ±0.20 (R2.29) +0.10 0.38 –0.05 KA431/KA431A/KA431L Mechanical Dimensions (Continued) Package Dimensions in millimeters TO-92 Ammo Type & Tape And Reel Type 9 KA431/KA431A/KA431L Mechanical Dimensions (Continued) Package Dimensions in millimeters #5 1.524 ±0.10 0.060 ±0.004 #4 0.018 ±0.004 #8 2.54 0.100 9.60 MAX 0.378 #1 9.20 ±0.20 0.362 ±0.008 ( 6.40 ±0.20 0.252 ±0.008 0.46 ±0.10 0.79 ) 0.031 8-DIP 5.08 MAX 0.200 7.62 0.300 3.40 ±0.20 0.134 ±0.008 +0.10 0.25 –0.05 +0.004 0~15° 10 0.010 –0.002 3.30 ±0.30 0.130 ±0.012 0.33 0.013 MIN KA431/KA431A/KA431L Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 6.00 ±0.30 0.236 ±0.012 8° 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 1.80 MAX 0.071 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0.41 ±0.10 0.016 ±0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 ±0.20 0.194 ±0.008 ( 0.56 ) 0.022 1.55 ±0.20 0.061 ±0.008 0.1~0.25 0.004~0.001 0.50 ±0.20 0.020 ±0.008 11 KA431/KA431A/KA431L Ordering Information Product Number KA431LZ KA431LD KA431AZ KA431AD Output Voltage Tolerance 0.5% 1% KA431 KA431Z Package Ammo Pack 8-SOP TO-92 8-SOP 2% TO-92 8-SOP 1% KA431AZTF Tape & Reel KA431LZMTA 0.5% KA431LZTF TO-92 Ammo Pack Tape & Reel KA431ZMTA KA431ZTA -25 ~ +85°C TO-92 KA431AZMTA KA431LZTA Shipping 8-DIP KA431D KA431AZTA Operating Temperature 2% KA431ZTF Ammo Pack Tape & Reel • For information on tape & reel and ammo pack specifications, including part orientation and tape sizes, please refer to our tape and reel data, http://www.fairchildsemi.com/products/analog/packaging/to92r.html DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. 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A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 2/22/11 0.0m 001 Stock#DS400029 © 2011 Fairchild Semiconductor Corporation