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参数资料
| 型号： | LX2173CP |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封装： | PLASTIC, TO-220, 5 PIN |
| 文件页数： | 1/6页 |
| 文件大小： | 254K |
| 代理商： | LX2173CP |
P RE LI MIN A R Y D ATA S HEET
T HE
I NFI N ITE
P O W ER
OF
I N NOVATIO N
L IN F IN IT Y M IC ROEL E C TRON IC S I NC .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Copyright 1998
Rev. 0.4a ,2005-03-09
LX2172 / 73
1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR
DESCRI PTI O N
The
LX2172/73
are
fixed-frequency,
current-mode switching regulator integrated
circuits. These ICs contain all necessary
control circuitry plus a 1.25A on-board
transistor to design a complete DC:DC
switching regulator with minimum external
components.
All functions are integrated into a single
IC, available in 8-pin DIP and SOIC or a 5-
pin TO-220 power package, making them
extremely easy to design with and use. The
LX2172/73 are optimized for
boost and flyback applications, but can
also be used in forward and inverting
converter configuations.
The LX2172 can be connected to an
external clock for synchronization, and can
enter micropower operation when the VC
pin is pulled low. The LX2173 has an
enable function, which permits extremely
low micropower operation, consuming
under 10A current when the ENABLE
pin is brought low
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT H I GHLIGHT
SEPIC C ONVER TER U SING THE LX2172
Input 6-24V, Output 7V, 300mA
L1
D1
E
2
V
C
FB
SYNC
GND
V
SW
E
1
V
IN
1mH
1
2
3
4
8
7
6
5
U1
R3
100
R2
3.0k
C4
0.47 F
(See Note 1)
R1
13.7k
C1
22F
VIN
6-24V DC
CDECOUPLE
0.47 F
1N5817
L2
1mH
COUT
220 F
7V
Output
7V
300mA
C3
0.1 F
C2
330 F
Note 1: SYNC Pin Requirements:
A) F
MAX = 200kHz
B) TTL Compatible Level
C) Pulse Width T
P Range - 0.1s < TP < 2.0s
KEY FEATUR ES
1.25A, 65V Internal Power
Switch
3V - 25V Input Voltage Range
Current-Mode Operation
Improved Internal Cycle-By-
Cycle Current Limiting
Thermal Shutdown
Less Than 10A Quiescent
Current In Microprocessor
Shutdown Mode
External Frequency
Synchronization Possible
100kHz Operating Frequency
APPLI CATI ONS
Boost Converter
Laptop / Notebook Computers
Portable Equipment
Small Motor Applications
Flyback Converters
Part #
Pin 4 Connection
LX2172
SYNC Input
LX2173
Low Power Mode
(Hi ENABLE)
PACKAGE ORDER INFO
M
Plastic DIP
8-Pin
DM
Plastic SOIC
8-Pin
P
Plastic TO-220
5-Pin
TA (
°C)
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free
Transition DC: 0440
0 to 70
LX217xCM
LX217xCDM
LX217xCP
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX2172CDM-TR)
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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