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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
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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
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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
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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
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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
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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.
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