SC431CZ-5 [SEMTECH]
ADJUSTABLE SHUNT REGULATOR; 可调并联稳压器
| 型号： | SC431CZ-5 |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | ADJUSTABLE SHUNT REGULATOR |
| 文件： | 总6页 (文件大小：114K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
The SC431 is a three terminal adjustable shunt regula-
tor with thermal stability guaranteed over temperature.
The output voltage can be adjusted to any value from
2.5V (VREF) to 36V with two external resistors. The
SC431 has a typical dynamic output impedance of
0.25Ω. Active output circuitry provides a very sharp
turn on characteristic, making the SC431 an excellent
replacement for zener diodes.
•
•
•
•
Wide operating current range 100µA to 150mA
Low dynamic output impedance 0.25 Ω typ.
Trimmed bandgap design + 0.5%
Alternate for TL431, LM431 & AS431
APPLICATIONS
•
•
•
•
•
•
Linear Regulators
The SC431 shunt regulator is available in three voltage
tolerances (0.5%, 1.0% and 2.0%) and three package
options (SOT-23-3, SO-8 and TO-92). The three volt-
age tolerances allow the designer the opportunity to
select the proper cost/tolerance for their application.
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
PIN CONFIGURATIONS
BLOCK DIAGRAM
SOT-23 -3 Lead (Top View)
SOIC 8 Lead (Top View)
SYMBOL DIAGRAM
TO-92 (Top View)
1
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
VZ
Maximum
37
Units
Cathode Voltage
V
Continous Cathode Current
Reference Input Current
IZ
150
mA
mA
°C
IREF
TJ
10
Operating Junction Temperature Range
Storage Temperature Range
-40 to +150
-65 to +150
TSTG
°C
Thermal Resistance
TO-92
SO-8
160
175
410
°C/W
θJA
SOT-23
Power Dissipation at TA = 25°C
TO-92
SO-8
SOT-23
PD
0.78
0.71
0.30
W
Lead Temperature (Soldering) 10 seconds
TLEAD
260
°C
ORDERING INFORMATION
PACKAGE
TOLERANCE
0.5%
1.0%
2.0%
T/R Quantity
2.5K
SO-8 (1)
SOT-23 (1)
TO-92 (1)(2)
SC431CS - .5
SC431CSK - .5
SC431CZ - .5
SC431CS - 1
SC431CSK - 1
SC431CZ - 1
SC431CS - 2
SC431CSK - 2
SC431CZ - 2
3K
TR=3K, TA=2K
Notes:
(1) Add suffix ‘TR’ for Tape & Reel.
(2) Add suffix ‘TA’ for Tape Ammo.
2
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C
SC431 0.5%
SC431 1%
SC431 2%
TYP MAX UNITS
Parameter
Symbol
Condition
VZ = VREF TA = 25°C
MIN TYP MAX MIN TYP MAX MIN
2.482 2.495 2.507 2.470 2.495 2.520 2.445 2.495 2.545
V
Reference Voltage
VREF
VDEV
IZ = 10mA
(test circuit 1)
VREF Temp Deviation
TA = -40 to +85°C, VZ = VREF
(test circuit 1) IZ = 10mA
8
17
8
25
15
30
mV
Ratio of Change in
VREF to Change in
Cathode Voltage
∆VREF
∆VZ
-0.5
-1.0
0.5
-2.7
-2.0
4
-0.5
-1.0
0.5
-2.7
-2.0
4
-0.5
-1.0
0.5
-2.7
-2.0
4
IZ = 10mA, ∆VZ = 10V to VREF
IZ = 10mA, ∆VZ = 36V to 10V
mV/V
µA
Reference Input
Current
IREF
R1 = 10kΩ, R2 = ∞,
IZ = 10mA
(test circuit 2)
IREF Temp Deviation IREF(DEV)
TA = -40 to +85°C,
0.4
1.2
0.5
0.4
1.2
0.5
0.4
1.2
0.5
µA
µA
R1 = 10kΩ, R2 = ∞, IZ =10mA
(test circuit 2)
Off State Cathode
Current
IZ (off)
rZ
VREF = 0V, VZ = 36V
(test circuit 3)
0.04
0.04
0.04
Dynamic Output
Impedance
f < 1kHz, VZ = VREF
IZ = 100uA to 100mA
(test circuit 1)
0.25
0.5
0.25
0.5
0.25
0.5
Ω
Minimum Operating
Current
IZ (min)
VZ = VREF
(test circuit 1)
100
100
100
µA
TEST CIRCUITS
Test Circuit 1:
VZ = VREF
Test Circuit 2:
VZ > VREF
Test Circuit 3:
Off State Current
RECOMMENDED OPERATING CONDITIONS
Min
VREF
0.1
Max
36
Symbol
V
Cathode Voltage, VZ
Cathode Current, IZ
150
mA
3
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
TYPICAL CHARACTERISTICS
Cathode Current vs. Cathode Voltage
Cathode Current vs. Cathode Voltage
300
150
100
50
VZ = VREF
VZ = VREF
TA = 25 o
C
TA = 25 o
C
200
100
0
0
-100
-200
-300
-50
-100
-150
-2
-1
0
1
2
3
-2
-1
0
1
2
3
V
Z (V)
VZ (V)
Reference Voltage vs.
Junction Temperature
Reference Input Current vs.
Junction Temperature
2.515
2.510
2.505
2.500
2.495
2.490
2.485
100
IZ = 10mA
R1 = 10kΩ
R2 = ∞
VZ = VREF
IZ = 10mA
80
60
40
20
0
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ (°C)
TJ (°C)
Ratio of Delta Reference Voltage to Delta
Cathode Voltage vs. Junction Temperature
Off-State Cathode Current
vs. Junction Temperature
0.5
0.4
0.3
0.2
0.1
0
100
IZ = 10mA
VZ = 36V
VREF = 0V
∆VZ = 3V to 36V
10
1
0.1
0.01
0.001
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ (°C)
T
J (°C)
4
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
TYPICAL CHARACTERISTICS (Cont.)
Small-Signal Gain and Phase Shift
vs. Frequency
Test Circuit For Small-Signal
Gain and Phase Shift
80
-180
-225
-270
-315
-360
IZ = 10mA
TA = 25°C
70
60
50
40
30
20
10
0
-10
-20
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
f (Hz)
Reference Impedance
vs. Frequency
100
IZ = 10mA
TA = 25°C
10
1
0.1
Notes for Application Circuit:
0.01
1) Set VOUT according to the following equation:
R1
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
f (Hz)
VOUT = VREF 1+
+ IREF R1
R2
APPLICATION CIRCUIT
2) Choose the value for R as follows:
•
•
The maximum limit for R should be such that the
cathode current, IZ, is greater than the minimum
operating current (100µA) at VIN(min)
.
The minimum limit for R should be such that IZ
does not exceed 150mA under all load conditions,
and the instantaneous turn-on value for IZ does not
exceed 200mA. Both of the following conditions
must be met:
VIN(max)
(to limit instantaneous turn-on IZ)
Rmin
Rmin
≥
≥
200mA
VIN(max) − VOUT
IOUT (min) +150 mA
(to limit IZ under normal
operating conditions)
5
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
ADJUSTABLE SHUNT REGULATOR
SC431
April 13, 1998
OUTLINE DRAWING SOT-23
OUTLINE DRAWING SO-8
OUTLINE DRAWING TO-92
6
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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