LM431BCM [FAIRCHILD]
Programmable Shunt Regulator; 可编程并联稳压器
| 型号： | LM431BCM |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Programmable Shunt Regulator |
| 文件： | 总12页 (文件大小：93K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
LM431A/LM431B/LM431C
Programmable Shunt Regulator
Features
Description
• Programmable Output Voltage to 36 Volts
• Low Dynamic Output Impedance 0.20 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
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
(approximately 2.5 volts) and 36 volts with
REF
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.
• Fast Turn-on Response
TO-92
1
1. Ref 2. Anode 3. Cathode
8-DIP
8-SOP
1
1
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
Internal Block Diagram
CATHODE
REFERENCE
2.5 Vref
ANODE
CATHODE (K)
REFERENCE (R)
ANODE (A)
Rev. 1.0.6
©2002 Fairchild Semiconductor Corporation
LM431A/LM431B/LM431C
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Symbol
Value
37
Unit
V
Cathode Voltage
V
KA
KA
Cathode Current Range (Continuous)
Reference Input Current Range
I
-100 ~ +150
0.05 ~ +10
mA
mA
I
REF
Power Dissipation
M, Z Suffix Package
N Suffix Package
P
770
1000
mW
D
Operating Temperature Range
LM431xC
-25 ~ +85
-40 ~ +85
150
°C
°C
°C
°C
T
T
OPR
LM431xI
Junction Temperature
Storage Temperature Range
T
J
-65 ~ +150
STG
Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Unit
Cathode Voltage
Cathode Current
V
V
-
-
36
V
KA
KA
REF
I
1.0
100
mA
2
LM431A/LM431B/LM431C
Electrical Characteristics
(T = +25°C, unless otherwise specified)
A
LM431A
LM431B
LM431C
Unit
Parameter
Symbol
Conditions
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Reference
Input Voltage
V
V = V
KA
, I =10mA 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
REF KA
V
REF
Deviation of
Reference
Input Voltage
Over-
∆V
∆T
/
/
V
=V
≤T ≤T
, I =10mA
-
-
-
REF
KA REF KA
4.5
17
4.5
17
4.5
17
mV
T
MIN MAX
A
Temperature
Ratio of
∆V =10V-
KA
-
-
-
-1.0 -2.7
-0.5 -2.0
-
-
-
-1.0 -2.7
-0.5 -2.0
-
-
-
-1.0 -2.7
-0.5 -2.0
V
Change in
Reference
Input Voltage
to the Change
in Cathode
Voltage
REF
∆V
REF
∆V
I
KA
=10mA
mV/V
µA
KA
∆V =36V-
KA
10V
Reference
Input Current
I
=10mA,
KA
I
1.5
0.4
4
1.5
0.4
4
1.5
0.4
4
REF
R =10kΩ,R =∞
1
2
Deviation of
Reference
Input Current
Over Full
Temperature
Range
I
=10mA,
KA
R =10kΩ,R =∞
-
-
-
-
-
-
1
2
∆I
/∆T
1.2
1.0
1.2
1.2
µA
REF
T
A
=Full Range
Minimum
Cathode Cur-
rent for
I
V
=V
0.45
0.45 1.0
0.45 1.0
mA
KA(MIN)
KA REF
Regulation
Off - Stage
Cathode
Current
V
V
=36V,
KA
I
-
-
0.05
0.15
1.0
0.5
-
-
0.05 1.0
0.15 0.5
-
-
0.05 1.0
0.15 0.5
µA
KA(OFF)
=0
REF
Dynamic
Impedance
V
=V ,
=1 to 100mA
KA REF
Z
I
Ω
KA
KA
f ≥1.0kHz
Note1
°
°
•
•
LM431 C : T
LM431 I : T
MIN
= -25 C, T
MAX
= +85 C
X
X
MIN
°
°
= -40 C, T
= +85 C
MAX
3
LM431A/LM431B/LM431C
Test Circuits
LM431A/B/C
LM431A/B/C
Figure 2. Test Circuit for V ≥V
KA REF
Figure 1. Test Circuit for V =V
KA REF
LM431A/B/C
Figure 3. Test Circuit for l
KA(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
B
A VKA = Vref
120
100
80
60
40
20
0
B VKA = 5.0 V @ IK = 10mA
C VKA = 10 V @ IK = 10mA
D VKA = 15 V @ IK = 10mA
TA = 25oC
C
D
100p
1n
10n
100n
1µ
10µ
CL, LOAD CAPACITANCE
Figure 10. Stability Boundary Conditions
6
LM431A/LM431B/LM431C
Typical Application
R1
VO = Vref 1 + ------
R2
R1
R1
1 + ------ Vref
R2
VO
=
1 + ------ Vref
VO =
R2
LM7805/MC7805
LM431A/B/C
LM431A/B/C
LM431A/B/C
Figure 12. Output Control for
Figure 13. High Current Shunt Regulator
Figure 11. Shunt Regulator
-
Three--Ter minal Fixed 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
+0.25
–0.15
4.58
0.46 ±0.10
+0.10
–0.05
1.27TYP
1.27TYP
0.38
[1.27 ±0.20
]
[1.27 ±0.20]
3.60 ±0.20
(R2.29)
8
LM431A/LM431B/LM431C
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
8-SOP
0.1~0.25
0.004~0.001
MIN
1.55 ±0.20
0.061 ±0.008
#8
#1
#4
#5
6.00 ±0.30
0.236 ±0.012
1.80
0.071
MAX
3.95 ±0.20
0.156 ±0.008
5.72
0.225
0.50 ±0.20
0.020 ±0.008
9
LM431A/LM431B/LM431C
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
8-DIP
6.40 ±0.20
0.252 ±0.008
#1
#4
#8
#5
3.30 ±0.30
0.130 ±0.012
5.08
0.200
MAX
7.62
3.40 ±0.20
0.134 ±0.008
0.300
0.33
MIN
0.013
0.25 +–00..1005
0.010+–00..000042
10
LM431A/LM431B/LM431C
Ordering Information
Product Number
LM431CCZ
LM431CCM
LM431BCZ
LM431BCM
LM431ACN
LM431ACZ
LM431ACM
LM431CIZ
Output Voltage Tolerance
Package
TO-92
8-SOP
TO-92
8-SOP
8-DIP
Operating Temperature
0.5%
1%
2%
-25 ~ +85°C
TO-92
8-SOP
TO-92
8-SOP
TO-92
8-SOP
TO-92
8-SOP
0.5%
1%
LM431CIM
LM431BIZ
-40 ~ +85°C
LM431BIM
LM431AIZ
2%
LM431AIM
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.
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.
www.fairchildsemi.com
8/20/02 0.0m 001
Stock#DSxxxxxxxx
2002 Fairchild Semiconductor Corporation
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