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LM1577K-883 Datasheet

  • LM1577K-883

  • SIMPLE SWITCHER Step-Up Voltage Regulator

  • 891.35KB

  • 27頁(yè)

  • NSC

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LM1577/LM2577 Series SIMPLE SWITCHER Step-Up Voltage Regulator
June 1999
LM1577/LM2577 Series
SIMPLE SWITCHER
廬
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
Requires few external components
NPN output switches 3.0A, can stand off 65V
Wide input voltage range: 3.5V to 40V
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
n
n
n
n
Typical Applications
n
Simple boost regulator
n
Flyback and forward regulators
n
Multiple-output regulator
Typical Application
DS011468-1
Note:
Pin numbers shown are for TO-220 (T) package.
Ordering Information
Temperature
Range
鈭?0藲C
鈮?/div>
T
A
鈮?/div>
+125藲C
Package
Type
24-Pin Surface Mount
16-Pin Molded DIP
5-Lead Surface Mount
5-Straight Leads
5-Bent Staggered
Leads
鈭?5藲C
鈮?/div>
T
A
鈮?/div>
+150藲C
4-Pin TO-3
Output Voltage
12V
LM2577M-12
LM2577N-12
LM2577S-12
LM2577T-12
LM2577T-12
Flow LB03
15V
LM2577M-15
LM2577N-15
LM2577S-15
LM2577T-15
LM2577T-15
Flow LB03
ADJ
LM2577M-ADJ
LM2577N-ADJ
LM2577S-ADJ
LM2577T-ADJ
LM2577T-ADJ
Flow LB03
LM1577K-
ADJ/883
K04A
TO-3
NSC
Package Package
Drawing
M24B
N16A
TS5B
T05A
T05D
SO
N
TO-263
TO-220
TO-220
LM1577K-12/883 LM1577K-15/883
SIMPLE SWITCHER
廬
is a registered trademark of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS011468
www.national.com

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