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| (R) TL431 PROGRAMMABLE VOLTAGE REFERENCE . . . . ADJUSTABLE OUTPUT VOLTAGE : 2.5 to 36V SINK CURRENT CAPABILITY : 1 to 100mA TYPICAL OUTPUT IMPEDANCE : 0.22 1% AND 2% VOLTAGE PRECISION Z TO92 (Plastic Package) N DIP8 (Plastic Package) DESCRIPTION The TL431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire temperature range of operation. The output voltage may be set to any value between Vref (approximately 2.5V) and 36V with two external resistors. The TL431 operates with a wide current range from 1 to 100mA with a typical dynamic impedance of 0.22. PIN CONNECTIONS TO92 (Top view) 8 D SO8 (Batwing Plastic Micropackage) ORDER CODES Part number Temperature Range TL431C/AC TL431I/AI 0oC, +70oC -40oC, +105oC Package Z * * N * * D * * DIP8 (Top view) 7 6 5 8 SO8 (Top view) 7 6 5 Cathode Anode Refere nce 1 2 3 1 2 3 4 5 6 7 8 1 2 3 4 - Cathode - N.C. - N.C. - N.C. - N.C. - Anode - N.C. - Reference 1 2 3 4 1 2 3 4 5 6 7 8 - Cathode - Anode - Anode - N.C. - N.C. - Anode - Anode - Reference November 1998 1/9 TL431 ABSOLUTE MAXIMUM RATINGS Symbol VKA IK Iref Toper Tstg Parameter Cathode to Anode Voltage Continuous Cathode Current Range Reference Input Current Range Operating Free-air Temperature Range TL431C/AC TL431I/AI Storage Temperature Range Value 37 -100 to +150 -0.05 to +10 0 to +70 -40 to +105 -65 to +150 Unit V mA mA o C C o OPERATING CONDITIONS Symbol VKA IK Cathode Current Parameter Cathode to Anode Voltage Value Vref to 36 1 to 100 Unit V mA ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified) Symbol Vref Vref Vref VKA Iref Parameter TL431C Min. Typ. Max. Min. 2.47 2.453 TL431AC Typ. 2.495 Max. 2.52 2.537 mV 3 17 3 15 mV/V -1.4 -1 -2.7 -2 -1.4 -1 -2.7 -2 A 1.8 4 5.2 1.8 4 5.2 A 0.4 1.2 0.4 1.2 mA 0.5 2.6 0.22 1 1000 0.5 0.5 2.6 0.22 0.6 1000 0.5 nA Unit V Reference Input Voltage - (figure 1) o Tamb = 25 C 2.44 2.495 2.55 VKA = Vref, IK = 10mA Tmin. Tamb Tmax. 2.423 2.567 Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA = Vref, IK = 10mA, T min. Tamb T max. Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) VKA = 10V to Vref IK = 10mA VKA = 36V to 10V Reference Input Current - (figure 2) IK = 10mA, R 1 = 10k, R 2 = Tamb = 25oC Tmin. Tamb Tmax. Reference Input Current Deviation Over Temperature Range - (figure 2) IK = 10mA, R 1 = 10k, R 2 = Tmin. Tamb Tmax. Minimum Cathode Current for Regulation - (figure 1) VKA = Vref Off-State Cathode Current - (figure 3) Dynamic Impedance - (figure 1, note 2) VKA = Vref, IK = 1 to 100mA, f 1kHz Iref Imin Ioff |ZKA| Notes : 1. Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. Vref = Vref max. - Vref min V ref ma x. V re fmin. T1 T2 Tempe ra tur e 2. The dynamic Impedance is defined as |ZKA| = VKA IK 2/9 TL431 ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified) Symbol Vref Vref Vref VKA Iref Parameter Reference Input Voltage - (figure 1) o Tamb = 25 C VKA = Vref, IK = 10mA Tmin. Tamb Tmax. Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA = Vref, IK = 10mA, T min. Tamb T max. Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) VKA = 10V to Vref IK = 10mA VKA = 36V to 10V Reference Input Current - (figure 2) IK = 10mA, R 1 = 10k, R 2 = Tamb = 25oC Tmin. Tamb Tmax. Reference Input Current Deviation Over Temperature Range - (figure 2) IK = 10mA, R 1 = 10k, R 2 = Tmin. Tamb Tmax. Minimum Cathode Current for Regulation - (figure 1) VKA = Vref Off-State Cathode Current - (figure 3) Dynamic Impedance - (figure 1, note 2) VKA = Vref, IK = 1 to 100mA, f 1kHz TL431I Min. 2.44 2.41 Typ. 2.495 Max. 2.55 2.58 Min. 2.47 2.44 TL431AI Typ. 2.495 Max. 2.52 2.55 mV 7 30 7 30 mV/V -1.4 -1 -2.7 -2 -1.4 -1 -2.7 -2 A 1.8 4 6.5 1.8 4 6.5 A 0.8 2.5 0.8 1.2 mA 0.5 2.6 0.22 1 1000 0.5 0.5 2.6 0.22 0.7 1000 0.5 nA Unit V Iref Imin Ioff |ZKA| Notes : 1. Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. Vref = Vrefmax. - Vref min V ref ma x. V re fmin. T1 T2 Tempe ra tur e 2. The dynamic Impedance is defined as |ZKA| = VKA IK 3/9 TL431 Reference voltage vs Temperature 2,58 Average 2,56 2% range 2,54 Referencevoltage (V) 1% range 2,52 Test circuit for Vka=Vref Input Ik=10mA Output 2,5 2,48 2,46 2,44 2,42 -40 -30 -20 -10 0 10 20 30 40 50 Temperature(C) 60 70 80 90 100 Vka=Vref Ik=10mA Vka Vref Cathode current vs Cathode voltage 100 90 80 70 Ika Cathode current (mA) 60 50 40 30 20 10 0 -10 -20 -30 -40 -50 -2 -1 0 1 Vka Cathode voltage(V) 2 3 -2 -1 -1,5 1,5 2 Cathode current vs Cathode voltage Vka=Vref Ta=25C Vka=Vref Ta=25C Ika CathodeCurrent (mA) 1 0,5 0 -0,5 -1 0 1 Vka Cathode voltage(V) 2 3 Reference input current vs temperature 1,2 Rka (Ohms) 0,24 1,1 Iref Referenceinput current (A) Rka - Static impedance vs Temperature Ika=10mA R1=10K R2=inf 0,235 Vka=Vref Ika =1 to 100mA 1 0,23 0,9 0,225 0,8 0,7 0,22 0,6 -40 -30 -20 -10 0 10 20 30 40 50 Temperature(C) 60 70 80 90 100 0,215 -40 -30 -20 -10 0 10 20 30 40 50 Temperature (C) 60 70 80 90 100 4/9 TL431 Off State cathode current vs temperature 1,4 Test circuit for Off-state current measurement Input Ioff Vka=36V Ioff Off State cathode current(A) 1,2 Vka=36V Vref=0V 1 0,8 0,6 0,4 0,2 0 -40 -30 -20 -10 0 10 20 30 40 50 Temperature(C) 60 70 80 90 100 Phase & Gain vs Frequency Gain(dB) 60 Phase () 180 160 50 140 10F Test circuit for Phase & Gain measurements 40 Gain 30 Phase 120 100 10F 6.8K Output Ik=10mA 80 20 60 10 40 0 1 2 5 10 20 50 Frequency (KHz) 100 200 500 20 1,000 Input 4.3K Vref Pulse response for Ik=1mA 6 Input 5 Input & Outputvoltage (V) Vka=Vref Ik=1mA Ta=25C Test circuit for pulse response at Ik=1mA 2.5K 4 3 Output Ik=1mA 50 1 0 -1 0 1 2 3 4 5 Time (s) 6 7 8 9 10 Output Intput 2 Pulse Generator 5/9 TL431 Pulse response for Ik=10mA 6 Test circuit for pulse response at Ik=10mA Input Vka=Vref Ik=10mA Ta=25C 250 5 Input & Output voltage(V) 4 3 Ik=10mA Output 50 1 0 -1 0 1 2 3 4 5 Time (s) 6 7 8 9 10 Stability conditions vs C apacitive loads 110 100 90 80 Cathode current(A) 70 60 50 Test circuit for Vka > Vref Vka=Vref Stable area Vka=5V Unstable area Input Stable area Vka Ik R1 Vka=12V Iref 40 30 20 10 0 1E-10 1E-9 1E-8 1E-7 Capacitive load (F) 0,000001 0,00001 Vka = Vref . (1+R 1/R2 ) + Iref . R1 Vka=24V R2 Vref 6/9 Output 2 Intput Pulse Generator TL431 PACKAGE MECHANICAL DATA 8 PINS - PLASTIC DIP Dim. A a1 B b b1 D E e e3 e4 F i L Z Millimeters Min. 0.51 1.15 0.356 0.204 7.95 2.54 7.62 7.62 6.6 5.08 3.18 3.81 1.52 0.125 1.65 0.55 0.304 10.92 9.75 0.313 Typ. 3.32 0.020 0.045 0.014 0.008 Max. Min. Inches Typ. 0.131 0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0260 0.200 0.150 0.060 Max. 7/9 TL431 PACKAGE MECHANICAL DATA 8 PINS - BATWING PLASTIC MICROPACKAGE (SO) Dimensions A a1 a2 a3 b b1 C c1 D E e e3 F L M S Min. 0.1 0.65 0.35 0.19 0.25 4.8 5.8 Millimeters Typ. Max. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 5.0 6.2 o Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228 Inches Typ. Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244 1.27 3.81 3.8 0.4 4.0 1.27 0.6 8o (max.) 0.150 0.016 0.050 0.150 0.157 0.050 0.024 8/9 TL431 PACKAGE MECHANICAL DATA 3 PINS - PLASTIC PACKAGE TO92 Dimensions L B O1 C K O2 a Min. 3.2 4.45 4.58 12.7 0.407 0.35 Millimeters Typ. 1.27 3.7 5.00 5.03 0.5 Max. 4.2 5.2 5.33 0.508 Min. 0.126 0.1752 0.1803 0.5 0.016 0.0138 Inches Typ. 0.05 0.1457 0.1969 0.198 0.0197 Max. 0.1654 0.2047 0.2098 0.02 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such info rmation nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publi cation are subject to change without notice. This publ ication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for useas critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a trademark of STMicroelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. (c) http://www.st.com 9/9 |
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