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| www.fairchildsemi.com TL431/TL431A 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 TL431/TL431Aare 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 excel lent replacement for zener diodes in many applications. TO-92 1 1. Ref 2. Anode 3. Cathode 8-DIP 1 1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref 8-SOP 1 1. Cathode 2. 3. 6. 7. Anode 8. Ref 4. 5. NC Rev. 1.0.3 (c)2003 Fairchild Semiconductor Corporation TL431/TL431A Internal Block Diagram Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation D, LP Suffix Package P Suffix Package Operating Temperature Range Junction Temperature Storage Temperature Range Symbol VKA IKA IREF PD TOPR TJ TSTG Value 37 -100 ~ +150 -0.05 ~ +10 770 1000 -25 ~ +85 150 -65 ~ +150 Unit V mA mA mW mW C C C Recommended Operating Conditions Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min VREF 1.0 Typ Max 36 100 Unit V mA 2 TL431/TL431A Electrical Characteristics (TA = +25C, unless otherwise specified) Parameter Reference Input Voltage Deviation of Reference Input Voltage OverTemperature (Note 1) 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 (Note 2) IREF Symbol VREF VREF/ T VREF/ VKA Conditions VKA=VREF, IKA=10mA VKA=VREF, IKA=10mA TMINTATMAX IKA =10mA VKA=10VVREF VKA=36V10V TL431 Min. Typ. TL431A Max. Min. Typ. Max. Unit V 2.440 2.495 2.550 2.470 2.495 2.520 - 4.5 - 10 -0.5 1.5 17 -2.7 -2.0 4 4.5 -1.0 -0.5 1.5 17 -2.7 mV - - mV/V -2.0 4 A IKA=10mA, R1=10K,R2= IKA=10mA, R1=10K,R2= TA =Full Range VKA=VREF VKA=36V, VREF=0 VKA=VREF, IKA=1 to 100mA f 1.0KHz IREF/T IKA(MIN) IKA(OFF) - 0.4 0.45 0.05 1.2 1.0 1.0 - 0.4 0.45 0.05 1.2 1.0 1.0 A mA A - - ZKA - 0.15 0.5 - 0.15 0.5 * TMIN= -25 C, TMAX= +85 C 3 TL431/TL431A Test Circuits TL431/A TL431/A Figure 1. Test Circuit for VKA=VREF Figure 2. Test Circuit for VKAVREF TL431/A Figure 3. Test Circuit for lKA(OFF) 4 TL431/TL431A Typical Perfomance Characteristics Figure 1. Cathode Current vs. Cathode Voltage Figure 2. Cathode Current vs. Cathode Voltage Figure 3. Change In Reference Input Voltage vs. Cathode Voltage Figure 4. Dynamic Impedance Frequency Figure 5. Small Signal Voltage Amplification vs. Frequency Figure 6. Pulse Response 5 TL431/TL431A 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 MC7805/LM7805 TL431/A TL431/A TL431/A Figure 10. Shunt Regulator Figure 11. Output Control for ThreeTermianl Fixed Regulator Figure 12. High Current Shunt Regulator TL431/A TL431/A Figure 13. Current Limit or Current Source Figure 14. Constant-Current Sink 6 TL431/TL431A Mechanical Dimensions Package TO-92 4.58 -0.15 +0.25 14.47 0.40 0.46 0.10 4.58 0.20 1.27TYP [1.27 0.20] 3.60 0.20 1.27TYP [1.27 0.20] 0.38 -0.05 +0.10 3.86MAX 1.02 0.10 0.38 -0.05 +0.10 (R2.29) (0.25) 7 TL431/TL431A Mechanical Dimensions (Continued) Package 8-DIP 0.018 0.004 1.524 0.10 0.060 0.004 0.46 0.10 6.40 0.20 0.252 0.008 #1 #8 9.20 0.20 0.362 0.008 9.60 MAX 0.378 #4 #5 2.54 0.100 ( 0.79 ) 0.031 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 MIN 0.013 0.25 -0.05 0~15 +0.10 0.010 -0.002 +0.004 8 TL431/TL431A Mechanical Dimensions (Continued) Package 8-SOP MIN 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 #1 #8 4.92 0.20 0.194 0.008 5.13 MAX 0.202 ( 0.56 ) 0.022 #4 #5 6.00 0.30 0.236 0.012 +0.10 0.15 -0.05 +0.004 0.006 -0.002 1.80 MAX 0.071 MAX0.10 MAX0.004 3.95 0.20 0.156 0.008 5.72 0.225 0.50 0.20 0.020 0.008 0~ 8 1.27 0.050 0.41 0.10 0.016 0.004 9 TL431/TL431A Ordering Information Product Number TL431ACLP TL431ACD TL431CLP TL431CP TL431CD 2% Output Voltage Tolerance 1% Package TO-92 8-SOP TO-92 8-DIP 8-SOP -25 ~ + 85oC 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 8/4/03 0.0m 001 Stock#DSxxxxxxxx 2003 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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