LM2577N-12 National Semiconductor, LM2577N-12 Datasheet

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LM2577N-12

Manufacturer Part Number
LM2577N-12
Description
SIMPLE SWITCHER Step-Up Voltage Regulator
Manufacturer
National Semiconductor
Datasheets

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© 1999 National Semiconductor Corporation
−40˚C
−55˚C
LM1577/LM2577 Series
SIMPLE SWITCHER
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.
Typical Application
Note: Pin numbers shown are for TO-220 (T) package.
Ordering Information
SIMPLE SWITCHER
Temperature
Range
T
T
A
A
+125˚C
+150˚C
®
is a registered trademark of National Semiconductor Corporation.
24-Pin Surface Mount
16-Pin Molded DIP
5-Lead Surface Mount
5-Straight Leads
5-Bent Staggered
4-Pin TO-3
Leads
Package
Type
DS011468
®
Step-Up Voltage Regulator
LM1577K-12/883 LM1577K-15/883
LM2577M-12
LM2577N-12
LM2577S-12
LM2577T-12
LM2577T-12
Flow LB03
12V
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
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
Typical Applications
n Simple boost regulator
n Flyback and forward regulators
n Multiple-output regulator
response, line regulation, and current limit
lockout, and thermal shutdown
Output Voltage
LM2577M-15
LM2577N-15
LM2577S-15
LM2577T-15
LM2577T-15
Flow LB03
15V
LM2577M-ADJ
LM2577N-ADJ
LM2577S-ADJ
LM2577T-ADJ
LM2577T-ADJ
Flow LB03
LM1577K-
ADJ/883
ADJ
DS011468-1
Package Package
Drawing
M24B
N16A
TS5B
T05A
T05D
K04A
NSC
www.national.com
June 1999
TO-263
TO-220
TO-220
TO-3
SO
N

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