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LM431A/LM431B/LM431C
Programmable Shunt Regulator
Features
• • • • Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.2Ω 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 LM431A/LM431B/LM431C are three terminal output adjustable regulators with thermal stability over operating temperature range. The output voltage can be set any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors. These devices have a typical dynamic output impedance of 0.2Ω. Active output circuit provides a sharp turn-on characteristic, making these devices excellent replacement for Zener Diodes in many applications.
TO-92
1
1. Ref 2. Anode 3. Cathode 8-DIP 8-SOP
1
1
1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref
1.Cathode 2.3.6.7.Anode 4.5.NC 8.Ref
Internal Block Diagram
REFERENCE
+ 2.5 Vref
CATHODE
ANODE CATHODE (K)
REFERENCE (R)
ANODE (A)
Rev. 1.0.8
©2011 Fairchild Semiconductor Corporation
LM431A/LM431B/LM431C
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.) Parameter Cathode Voltage Cathode Current Range (Continuous) Reference Input Current Range Power Dissipation M, Z Suffix Package N Suffix Package Operating Temperature Range LM431xC LM431xI Junction Temperature Storage Temperature Range TOPR TJ TSTG -25 ~ +85 -40 ~ +85 150 -65 ~ +150 °C °C °C °C Symbol VKA IKA IREF PD Value 37 -100 ~ +150 -0.05 ~ +10 770 1000 Unit V mA mA mW
Recommended Operating Conditions
Parameter Cathode Voltage Cathode Current Symbol VKA IKA Min VREF 1.0 Typ Max 36 100 Unit V mA
2
LM431A/LM431B/LM431C
Electrical Characteristics
(TA = +25°C, 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
Symbol
VREF
Conditions
VKA = VREF, IKA =10mA
LM431A
LM431B
LM431C
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
Unit
V
ΔVREF/ ΔT
VKA=VREF, IKA=10mA TMIN≤TA≤TMAX
ΔVKA=10VVREF
-
4.5
17
-
4.5
17
-
4.5
17
mV
-
-1.0
-2.7
-
-1.0
-2.7
-
-1.0
-2.7 mV/V
ΔVREF/ ΔVKA
IKA =10mA
ΔVKA=36V10V
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
IREF
IKA=10mA, R1=10kΩ,R2=∞
-
1.5
4
-
1.5
4
-
1.5
4
μA
IKA=10mA, R1=10kΩ,R2=∞ ΔIREF/ΔT TA =Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
μA
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
μA
ZKA
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
Ω
Note1 • LM431XC : TMIN = -25 °C, TMAX = +85°C • LM431XI : TMIN = -40°C, TMAX = +85°C
3
LM431A/LM431B/LM431C
Test Circuits
LM431A/B/C LM431A/B/C
Figure 1. Test Circuit for VKA=VREF
Figure 2. Test Circuit for VKA≥VREF
LM431A/B/C
Figure 3. Test Circuit for lKA(OFF)
4
LM431A/LM431B/LM431C
Typical Performance Characteristics
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
Figure 6. Change In Reference Input Voltage vs.
Cathode Voltage
Figure7. Dynamic Impedance Frequency
Figure 8. Small Signal Voltage Amplification vs. Frequency
Figure 9. Pulse Response
5
LM431A/LM431B/LM431C
Typical Performance Characteristics (Continued)
140
A
120 A VKA = Vref B VKA = 5.0 V @ IK = 10mA C VKA = 10 V @ IK = 10mA D VKA = 15 V @ IK = 10mA TA = 25 C 80
o
B C
IK, CATHODE CURRENT(mA)
100
60
stable
stable
40
20
D
0 100p
1n
10n
100n
1
10
CL, LOAD CAPACITANCE
Figure 10. Stability Boundary Conditions
6
LM431A/LM431B/LM431C
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⎠
LM7805/MC7805
LM431A/B/C
LM431A/B/C LM431A/B/C
Figure 11. Shunt Regulator
Figure 12. Output Control for Three--Te r- minal Fixed Regulator
Figure 13. High Current Shunt Regulator
LM431A/B/C
LM431A/B/C
Figure 14. Current Limit or Current Source
Figure 15. Constant-Current Sink
7
LM431A/LM431B/LM431C
Mechanical Dimensions
Package Dimensions in millimeters
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)
8
(0.25)
LM431A/LM431B/LM431C
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
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
LM431A/LM431B/LM431C
Mechanical Dimensions (Continued)
Package Dimensions in millimeters
8-DIP
1.524 ±0.10 0.018 ±0.004 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 0.013 MIN
0.25 –0.05
0~15°
+0.10
0.010 –0.002
+0.004
10
LM431A/LM431B/LM431C
Ordering Information
Product Number LM431CCZ LM431CCM LM431BCZ LM431BCM LM431ACN LM431ACZ LM431ACM LM431CIZ LM431CIM LM431BIZ LM431BIM LM431AIZ LM431AIM 0.5% 1% 2% 2% Output Voltage Tolerance 0.5% 1% Package TO-92 8-SOP TO-92 8-SOP 8-DIP TO-92 8-SOP TO-92 8-SOP TO-92 8-SOP TO-92 8-SOP -40 ~ +85°C -25 ~ +85°C Operating Temperature
11
LM431A/LM431B/LM431C
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 2/16/11 0.0m 001 Stock#DS400300 © 2011 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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