LM431A_11 FAIRCHILD [Fairchild Semiconductor], LM431A_11 Datasheet

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LM431A_11

Manufacturer Part Number
LM431A_11
Description
Programmable Shunt Regulator
Manufacturer
FAIRCHILD [Fairchild Semiconductor]
Datasheet
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
• Temperature Compensated for Operation Over Full Rated
• Low Output Noise Voltage
• Fast Turn-on Response
Internal Block Diagram
©2011 Fairchild Semiconductor Corporation
LM431A/LM431B/LM431C
Programmable Shunt Regulator
50ppm/°C Typical
Operating Temperature Range
REFERENCE (R)
REFERENCE
2.5 Vref
CATHODE (K)
ANODE (A)
+
-
ANODE
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 V
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
8-DIP
1.Cathode 2.3.4.5.7.NC
1. Ref 2. Anode 3. Cathode
6.Anode 8.Ref
1
1
REF
(approximately 2.5 volts) and 36 volts with
CATHODE
www.fairchildsemi.com
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
8-SOP
1
Rev. 1.0.8

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LM431A_11 Summary of contents

Page 1

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 ...

Page 2

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 ...

Page 3

Electrical Characteristics (T = +25°C, unless otherwise specified) A Parameter Symbol Reference REF KA Input Voltage Deviation of Reference ΔV Input Voltage / V =V REF KA ΔT ≤T Over- T MIN Temperature Ratio of Change ...

Page 4

LM431A/LM431B/LM431C Test Circuits LM431A/B/C Figure 1. Test Circuit for V Figure 3. Test Circuit for REF LM431A/B/C KA(OFF) LM431A/B/C ≥V Figure 2. Test Circuit for V KA REF ...

Page 5

Typical Performance Characteristics Figure 4. Cathode Current vs. Cathode Voltage Figure 6. Change In Reference Input Voltage vs. Cathode Voltage Figure 8. Small Signal Voltage Amplification vs. Frequency LM431A/LM431B/LM431C Figure 5. Cathode Current vs. Cathode Voltage Figure7. Dynamic Impedance Frequency ...

Page 6

LM431A/LM431B/LM431C Typical Performance Characteristics 140 Vref 120 5 100 ...

Page 7

Typical Application R ⎛ ⎞ ------ - ⎝ ⎠ O ref R 2 LM431A/B/C . Figure 11 Shunt Regulator LM431A/B/C Figure 14. Current Limit or Current Source R ⎛ ⎞ 1 ------ - V ...

Page 8

LM431A/LM431B/LM431C Mechanical Dimensions Package +0.25 4.58 –0.15 ±0.10 0.46 1.27TYP ±0.20 [1.27 ] ±0.20 3.60 8 TO-92 1.27TYP ±0.20 [1.27 ] (R2.29) Dimensions in millimeters +0.10 0.38 –0.05 ...

Page 9

Mechanical Dimensions Package #1 #4 0.236 3.95 0.156 0.50 ±0.20 ±0.008 0.020 (Continued) 8-SOP 1.55 ±0.20 ±0.008 0.061 #8 #5 ±0.30 6.00 1.80 MAX ±0.012 0.071 ±0.20 ±0.008 5.72 0.225 LM431A/LM431B/LM431C Dimensions in millimeters 0.1~0.25 MIN 0.004~0.001 9 ...

Page 10

LM431A/LM431B/LM431C Mechanical Dimensions Package ±0.20 6.40 ±0.008 0.252 #1 #4 7.62 0.300 10 (Continued) 8-DIP #8 #5 5.08 MAX 0.200 ±0.20 3.40 ±0.008 0.134 Dimensions in millimeters ±0.30 3.30 ±0.012 0.130 0.33 MIN 0.013 ...

Page 11

Ordering Information Product Number Output Voltage Tolerance LM431CCZ LM431CCM LM431BCZ LM431BCM LM431ACN LM431ACZ LM431ACM LM431CIZ LM431CIM LM431BIZ LM431BIM LM431AIZ LM431AIM Package TO-92 0.5% 8-SOP TO-92 1% 8-SOP 8-DIP 2% TO-92 8-SOP TO-92 0.5% 8-SOP TO-92 1% 8-SOP TO-92 2% 8-SOP ...

Page 12

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 ...

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