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 0.2W 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 0.20 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. 1.0.6 ©2002 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 IREF 0.05 ~ +10 mA Power Dissipation D, Z Suffix Package DIP Package PD 770 1000 mW mW Junction Temperature TJ 150 °C Reference Input Current Range Operating Temperature Range TOPR -25 ~ +85 °C Storage Temperature Range TSTG -65 ~ +150 °C 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 Ratio of Change in Reference Input Voltage ∆VREF/ ∆T ∆VREF/ ∆VKA to the Change in Cathode Voltage Conditions VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA TMIN≤TA≤TMAX IKA =10mA ∆VKA=10 V-VREF 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 -1.0 - 2.7 - - 4.5 17 -1.0 - 2.7 - - 4.5 17 -1.0 -2.7 Unit V mV mV/V ∆VKA=36 V-10V - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 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=∞ ∆IREF/∆T 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 Reference Input Current Dynamic Impedance IREF ZKA - - • 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 60 40 D 20 0 100p 1n 10n 100n 1µ CL, LOAD CAPACITANCE Figure 10. Stability Boundary Conditions 6 10µ KA431/KA431A/KA431L Typical Application R V O = 1 + ------1- V ref R 2 Figure 11. Shunt Regulator R V O = V ref 1 + ------1- R2 R V O = 1 + ------1- V ref R Figure 12. Output Control for Three--Te r minal Fixed Regulator Figure 13. High Current Shunt Regulator Figure 14. Current Limit or Current Source 2 Figure 15. Constant-Current Sink 7 KA431/KA431A/KA431L Mechanical Dimensions Package Dimensions in millimeters TO-92 +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 1.524 ±0.10 #5 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 3.30 ±0.30 0.130 ±0.012 0.33 0.013 MIN +0.10 0.25 –0.05 +0.004 0~15° 0.010 –0.002 9 KA431/KA431A/KA431L Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 10 0~ 8° +0.10 0.15 -0.05 +0.004 0.006 -0.002 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0.50 ±0.20 0.020 ±0.008 1.80 MAX 0.071 MAX0.10 MAX0.004 6.00 ±0.30 0.236 ±0.012 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 KA431/KA431A/KA431L Ordering Information Product Number KA431LZ KA431LD KA431AZ KA431AD Output Voltage Tolerance 0.5% 1% KA431 KA431Z KA431D Package Operating Temperature TO-92 8-SOP TO-92 8-SOP -25 ~ +85°C 8-DIP 2% TO-92 8-SOP 11 KA431/KA431A/KA431L DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. 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 8/20/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation