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| www.fairchildsemi.com KA431S/KA431SA/KA431SL Programmable Shunt Regulator Features 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 * * * * Description The KA431S/KA431SA/KA431SL 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. SOT-23F 3 1 2 MF- 1.Cathode 2. Ref 3. Anode MF2- 1. Ref 2. Cathode 3. Anode Internal Block Diagram REFERENCE + 2.5 Vref CATHODE ANODE CATHODE (K) REFERENCE (R) ANODE(A) Rev. 1.0.6 (c)2005 Fairchild Semiconductor Corporation KA431S/KA431SA/KA431SL Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Thermal Resistance Junction-Air (Note1,2) MF Suffix Package Power Dissipation (Note3,4) MF Suffix Package Junction Temperature Operating Temperature Range Storage Temperature Range Note : 1. Thermal resistance test board Symbol VKA IKA IREF RJA PD TJ TOPR TSTG Value 37 -100 ~ +150 -0.05 ~ +10 350 350 150 -25 ~ +85 -65 ~ +150 Unit V mA mA C/W mW C C C Size: 76.2mm * 114.3mm * 1.6mm (1S0P) JEDEC Standard: JESD51-3, JESD51-7 2. Assume no ambient airflow. 3. TJMAX = 150C, Ratings apply to ambient temperature at 25C 4. Power dissipation calculation: PD = (TJ - TA)/RJA Recommended Operating Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min. VREF 1.0 Typ. Max. 36 100 Unit V mA 2 KA431S/KA431SA/KA431SL Electrical Characteristics (TA = +25C, unless otherwise specified) Parameter Reference Input Voltage Deviation of Reference Input Voltage OverTemperature Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage Reference Input Current Deviation of Reference Input Current Over Full Temperature Range Minimum Cathode Current for Regulation Off - Stage Cathode Current Dynamic Impedance IREF Symbol VREF VREF/ T Conditions VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA TMINTATMAX VKA=10 V-VREF VKA=36 V-10V KA431S Min. Typ. KA431SA KA431SL Typ. Max. Max. Min. Typ. Max. Min. Unit V 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 - 4.5 17 - 4.5 17 - 4.5 17 mV VREF/ VKA - -1.0 -2.7 - -1.0 -2.7 - -1.0 -2.7 mV/V IKA =10mA - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 IKA=10mA, R1=10k,R2= - 1.5 4 - 1.5 4 - 1.5 4 A IKA=10mA, R1=10k,R2= IREF/T TA =Full Range - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 A IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 mA IKA(OFF) VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA f 1.0kHz - 0.05 1.0 - 0.05 1.0 - 0.05 1.0 A ZKA - 0.15 0.5 - 0.15 0.5 - 0.15 0.5 * TMIN = -25C, TMAX = +85C 3 KA431S/KA431SA/KA431SL Test Circuits KA431S KA431S Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKAVREF KA431S Figure 3. Test Circuit for lKA(OFF) 4 KA431S/KA431SA/KA431SL Typical Performance Characteristics 800 150 VKA = VREF TA = 25 C o VKA = VREF TA = 25 C o 600 100 IKA, CATHODE CURRENT (uA) IK, Cathode Current (mA) 50 400 IKA(MIN) 0 200 -50 0 -100 -2 -1 0 1 2 3 VKA, Cathode Voltage (V) -200 -1 0 1 VKA, CATHODE VOLTAGE (V) 2 3 Figure 4. Cathode Current vs. Cathode Voltage Figure 5. Cathode Current vs. Cathode Voltage 0.100 3.5 3.0 Ioff, Off-State Cathode Current (uA) 0.075 Iref, Reference Input Current (uA) 2.5 2.0 0.050 1.5 0.025 1.0 0.5 0.000 -50 -25 0 25 50 75 o 100 125 0.0 -50 -25 0 25 50 75 o 100 125 TA, Ambient Temperature ( C) TA, Ambient Temperature ( C) Figure 6. OFF-State Cathode Current vs. Ambient Temperature Figure7. Reference Input Current vs. Ambient Temperature 60 TA = 25 C IKA = 10mA o 6 TA=25 C o 50 5 INPUT 40 Open Loop Voltage Gain (dB) 4 30 Voltage Swing (V) 3 OUTPUT 20 2 10 1 0 -10 1k 10k 100k Frequency (Hz) 0 1M 10M 0 4 8 Time (us) 12 16 20 Figure 8. Small Signal Voltage Amplification vs. Frequency Figure 9. Pulse Response 5 KA431S/KA431SA/KA431SL Typical Performance Characteristics (Continued) 5 140 A VKA = Vref B VKA = 5.0 V @ IK = 10mA TA = 25 C o 120 4 IK, CATHODE CURRENT(mA) 100 A 80 60 stable stable Current(mA) 1! 10! 3 2 40 1 20 B 0 100p 1n 10n 100n CL, LOAD CAPACITANCE 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Anode-Ref. Voltage(V) Figure 10. Stability Boundary Conditions 5 Figure 11. Anode-Reference Diode Curve 4 Current(mA) 3 2 1 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Ref.-Cathode Voltage(V) Figure 12. Reference-Cathode Diode Curve 6 KA431S/KA431SA/KA431SL Typical Application R1 V O = 1 + ------ V ref R 2 R1 V O = V ref 1 + ------ R 2 R1 V O = 1 + ------ V ref R 2 KA431S KA431S KA431S Figure 13. Shunt Regulator - Figure 14. Output Control for Figure 15. High Current Shunt Regulator Three-Termianl Fixed Regulator KA431S KA431S Figure 16. Current Limit or Current Source Figure 17. Constant-Current Sink 7 KA431S/KA431SA/KA431SL Mechanical Dimensions Package Dimensions in millimeters SOT-23F 8 KA431S/KA431SA/KA431SL Marking 43A 43B 43C MF2% tolerance 1% tolerance 0.5% tolerance 43D 43E 43F 43A MF22% tolerance 43B 43C 1% tolerance 0.5% tolerance 9 KA431S/KA431SA/KA431SL Ordering Information Product Number KA431SLMF KA431SAMF KA431SMF KA431SLMF2 KA431SAMF2 KA431SMF2 Output Voltage Tolerance 0.5% 1% 2% 0.5% 1% 2% Package SOT-23F SOT-23F SOT-23F SOT-23F SOT-23F SOT-23F -25 ~ +85C Operating Temperature 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. www.fairchildsemi.com 6/8/05 0.0m 001 Stock#DSxxxxxxxx 2005 Fairchild Semiconductor Corporation 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. |
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