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參數資料
| 型號： | LM1577-ADJ |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | SIMPLE SWITCHER Step-Up Voltage Regulator |
| 中文描述： | SIMPLE SWITCHER系列升壓穩壓器 |
| 文件頁數： | 1/27頁 |
| 文件大小： | 907K |
| 代理商： | LM1577-ADJ |
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LM1577/LM2577 Series
SIMPLE SWITCHER
Step-Up Voltage Regulator
General Description
The LM1577/LM2577 are monolithic integrated circuits that
provide all of the power and control functions for step-up
(boost), flyback, and forward converter switching regulators.
The device is available in three different output voltage ver-
sions: 12V, 15V, and adjustable.
Requiring a minimum number of external components, these
regulators are cost effective, and simple to use. Listed in this
data sheet are a family of standard inductors and flyback
transformers designed to work with these switching regula-
tors.
Included on the chip is a 3.0A NPN switch and its associated
protection circuitry, consisting of current and thermal limiting,
and undervoltage lockout. Other features include a 52 kHz
fixed-frequency oscillator that requires no external compo-
nents, a soft start mode to reduce in-rush current during
start-up, and current mode control for improved rejection of
input voltage and output load transients.
Features
n
Requires few external components
n
NPN output switches 3.0A, can stand off 65V
n
Wide input voltage range: 3.5V to 40V
n
Current-mode operation for improved transient
response, line regulation, and current limit
n
52 kHz internal oscillator
n
Soft-start function reduces in-rush current during start-up
n
Output switch protected by current limit, under-voltage
lockout, and thermal shutdown
Typical Applications
n
Simple boost regulator
n
Flyback and forward regulators
n
Multiple-output regulator
Typical Application
Ordering Information
Temperature
Range
Package
Type
Output Voltage
15V
NSC
Package Package
Drawing
M24B
N16A
TS5B
T05A
T05D
12V
ADJ
40C
≤
T
A
≤
+125C
24-Pin Surface Mount
16-Pin Molded DIP
5-Lead Surface Mount
5-Straight Leads
5-Bent Staggered
Leads
4-Pin TO-3
LM2577M-12
LM2577N-12
LM2577S-12
LM2577T-12
LM2577T-12
Flow LB03
LM1577K-12/883 LM1577K-15/883
LM2577M-15
LM2577N-15
LM2577S-15
LM2577T-15
LM2577T-15
Flow LB03
LM2577M-ADJ
LM2577N-ADJ
LM2577S-ADJ
LM2577T-ADJ
LM2577T-ADJ
Flow LB03
LM1577K-
ADJ/883
SO
N
TO-263
TO-220
TO-220
55C
≤
T
A
≤
+150C
K04A
TO-3
SIMPLE SWITCHER
is a registered trademark of National Semiconductor Corporation.
DS011468-1
Note:
Pin numbers shown are for TO-220 (T) package.
June 1999
L
1999 National Semiconductor Corporation
DS011468
www.national.com
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| LM1577K-12 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator |
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| LM1577K-15 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER-R Step-Up Voltage Regulator |
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