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| TL1431 PROGRAMMABLE VOLTAGE REFERENCE . . . . ADJUSTABLE OUTPUT VOLTAGE : Vref to 36V SINK CURRENT CAPABILITY : 1 to 100mA TYPICAL OUTPUT IMPEDANCE : 0.2 0.4% AND 0.25% VOLTAGE PRECISION Z TO92 (Plastic Package) D SO8 (Batwing Plastic Micropackage) DESCRIPTION The TL1431 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 TL1431 operates with a wide current range from 1 to 100mAwith a typical dynamic impedance of 0.2. PIN CONNECTIONS TO92 (Top view) 8 ORDER CODES Part number TL1431C/AC TL1431I/AI Temperature Range -20 C, +70 C -40 C, +105 C o o o o Package Z * * D * * SO8 (Top view) 7 6 5 Ca thode Ano de Reference 1 2 3 1 2 3 4 1 2 3 4 5 6 7 8 - Cathode - Anode - Anode - N.C. - N.C. - Anode - Anode - Reference March 1998 1/8 TL1431 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 TL1431C/AC TL1431I/AI Storage Temperature Range Value 37 -100 to +150 -0.05 to +10 -20 to +70 -40 to +105 -65 to +150 Unit V mA mA o C o C OPERATING CONDITIONS Symbol VKA IK Parameter Cathode to Anode Voltage Cathode Current Value Vref to 36 1 to 100 Unit V mA ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified) Symbol Vref Vref Vref T Vref VKA Iref Parameter Reference Input Voltage - (figure 1) o Tamb = 25 C VKA = Vref, IK = 10mA Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Temperature Coefficient of Reference Input Voltage - (note 2) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) IK = 10mA, VKA = 36V to 3V Reference Input Current - (figure 2) IK = 10mA, R1 = 10k, R 2 = Tamb = 25oC Tmin. Tamb Tmax. Reference Input Current Deviation Over Temperature Range - (figure 2) IK = 10mA, R1 = 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 3) VKA = Vref, IK = 1 to 100mA, f 1kHz Min. 2.490 TL1431C Typ. Max. Min. TL1431AC Typ. Max. 2.500 2.507 mV 3 13 -2 -1.1 20 90 -2 3 13 -1.1 A 1.5 2.5 3 1.5 2.5 3 A 0.2 1.2 0.2 1.2 mA 0.5 180 0.2 1 500 0.5 0.5 180 0.2 0.6 500 0.5 nA 20 ppm/ oC 90 mV/V Unit V 2.500 2.510 2.493 Iref Imin Ioff |ZKA| Notes : 1. Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. V ref ma x. Vref = Vref max. - Vref min V re fmin. T1 T2 Tempe ra tur e 2. The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin which the reference voltage is guaranteed. -n p pm / C /C ppm +n max 2.5V min 25 C Te m pe ra ture 3. VKA The dynamic Impedance is defined as |ZKA| = IK 2/8 TL1431 ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified) Symbol Vref Vref Vref T Vref VKA Iref Parameter Reference Input Voltage - (figure 1) o Tamb = 25 C VKA = Vref, IK = 10mA Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Temperature Coefficient of Reference Input Voltage - (note 2) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) IK = 10mA, VKA = 36 to 3V Reference Input Current - (figure 2) IK = 10mA, R1 = 10k, R 2 = Tamb = 25oC Tmin. Tamb Tmax. Reference Input Current Deviation Over Temperature Range - (figure 2) IK = 10mA, R1 = 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 3) VKA = Vref, IK = 1 to 100mA, f 1kHz TL1431I Min. 2.490 Typ. Max. Min. TL1431AI Typ. 2.500 Max. 2.507 mV 7 22 30 100 7 22 30 ppm/ oC 100 mV/V -1.1 -2 -1.1 -2 A 1.5 2.5 3 1.5 2.5 3 A 0.5 1 0.8 1.2 mA 0.5 180 0.2 1 500 0.5 0.5 180 0.2 0.7 500 0.5 nA Unit V 2.500 2.510 2.493 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 re fma x. V ref min. T1 T2 Tempera ture 2. The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin which the reference voltage is guaranteed. -n pp m / C max 2.5V min /C p pm +n 3. VKA The dynamic Impedance is defined as |ZKA| = IK 25 C Te m pe ra ture 3/8 TL1431 Figure 1 : Test Circuit for VKA = Vref Figure 2 : Test Circuit for VKA > Vref Input I V KA Input IK I re f VKA K R1 R2 V ref Vre f VKA = Vref (1 + R1 ) + Iref . R1 R2 Figure 3 : Test Circuit for Ioff Figure 4 : Test Circuit for Phase Margin and Voltage Gain Input I off VKA = 36V Vka Ik=10mA 15K 10F 10F Output 230 Iref Input 8.25K Vref 4/8 TL1431 DRIFT (mV) vs TEMPERATURE (oC) Ik = 10mA Vka = Vre f = 2.5V Vref drift (mV) 0 -2 -4 -6 -8 -10 -12 -14 -40 -20 0 20 40 60 80 100 120 CATHODE CURRENT vs CATHODE VOLTAGE Vka = Vref Temperature (C) CATHODE CURRENT vs CATHODE VOLTAGE (detailed version) Vka = Vref REFERENCE CURRENT vs TEMPERATURE Ik = 10mA Vka = Vref Iref (A) 2 1,8 1,6 1,4 1,2 1 -40 -20 0 20 40 60 Temperature (C) 80 100 120 OFF-STATE CATHODE CURRENT vs TEMPERATURE RATIO OF CHANGE IN Vref TO CHANGE IN VKA vs TEMPERATURE Ik = 10mA Vka = Vref = 2.5V Ioff (A) 0,1 0,08 d(Vref) / d(Vka ) (mV/V) -0,9 -1 -1,1 0,06 0,04 0,02 0 -1,2 -1,3 -1,4 -1,5 -40 -20 0 20 40 60 80 100 120 -1,6 -40 -20 0 Temperature (C) 20 40 60 Temperature (C) 80 100 120 5/8 TL1431 DRIFT OF RKA vs TEMPERATURE Ik = 10mA Vka = Vref = 2.5V Drift (Ohms) 0 Imin (mA) 0,52 0,5 0,48 MINIMUM OPERATING CURRENT vs TEMPERATURE Ik = Ikmin. Vka = Vref -0,01 -0,02 0,46 0,44 -0,03 0,42 0,4 -0,04 -40 -20 0 20 40 60 80 100 120 -40 -20 0 Temperature (C) 20 40 60 Temperature (C) 80 100 120 PHASE MARGIN vs FREQUENCY Ik = 10mA Phase () 200 STABILITY FOR CAPACITIVE LOADS Gain (dB) 60 Current (mA) 120 100 Gain 100 50 40 Phase 30 20 80 60 40 20 0 1E-10 0 10 0 -10 -1 00 -20 -30 -2 00 1 3 10 30 1 00 3 00 1,000 3,000 -40 10,000 1E-9 1E-8 1E-7 0,000001 0,00001 Capacitive loads (F) 2.5V 5.0V 10 V 15 V 20 V 28 V Frequency (KHz) 6/8 TL1431 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 8 (max.) o 0.050 0.150 0.150 0.016 0.157 0.050 0.024 7/8 TL1431 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, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information 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 SGS-THOMSON Microelectronics. Specification mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. (c) 1998 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOM SON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 8/8 |
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