LM2577S-12 National Semiconductor, LM2577S-12 Datasheet

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LM2577S-12

Manufacturer Part Number
LM2577S-12
Description
IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR,SIP,5PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheets

Specifications of LM2577S-12

Rohs Compliant
NO

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© 2005 National Semiconductor Corporation
LM1577/LM2577
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
versions: 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.
Connection Diagrams
SIMPLE SWITCHER
Order Number LM2577T-12, LM2577T-15,
See NS Package Number T05A
®
is a registered trademark of National Semiconductor Corporation.
5-Lead TO-220 (T)
or LM2577T-ADJ
Straight Leads
Top View
DS011468
®
Step-Up Voltage Regulator
01146804
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
Order Number LM2577T-12 Flow LB03, LM2577T-15
response, line regulation, and current limit
lockout, and thermal shutdown
Flow LB03, or LM2577T-ADJ Flow LB03
See NS Package Number T05D
Bent, Staggered Leads
5-Lead TO-220 (T)
Top View
www.national.com
01146805
April 2005

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