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LM1577 データシート(PDF) 1 Page - Texas Instruments

部品番号 LM1577
部品情報  LM1577/LM2577 SIMPLE SWITCHER짰 Step-Up Voltage Regulator
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM1577 データシート(HTML) 1 Page - Texas Instruments

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LM1577, LM2577
www.ti.com
SNOS658D – JUNE 1999 – REVISED APRIL 2013
LM1577/LM2577 SIMPLE SWITCHER® Step-Up Voltage Regulator
Check for Samples: LM1577, LM2577
1
FEATURES
DESCRIPTION
The
LM1577/LM2577
are
monolithic
integrated
23
Requires Few External Components
circuits that provide all of the power and control
NPN Output Switches 3.0A, can Stand off 65V
functions for step-up (boost), flyback, and forward
Wide Input Voltage Range: 3.5V to 40V
converter
switching
regulators.
The
device
is
available in three different output voltage versions:
Current-mode Operation for Improved
12V, 15V, and adjustable.
Transient Response, Line Regulation, and
Current Limit
Requiring
a
minimum
number
of
external
components, these regulators are cost effective, and
52 kHz Internal Oscillator
simple to use. Listed in this data sheet are a family of
Soft-start Function Reduces In-rush Current
standard inductors and flyback transformers designed
During Start-up
to work with these switching regulators.
Output Switch Protected by Current Limit,
Included on the chip is a 3.0A NPN switch and its
Under-voltage Lockout, and Thermal
associated protection circuitry, consisting of current
Shutdown
and thermal limiting, and undervoltage lockout. Other
features include a 52 kHz fixed-frequency oscillator
TYPICAL APPLICATIONS
that requires no external components, a soft start
mode to reduce in-rush current during start-up, and
Simple Boost Regulator
current mode control for improved rejection of input
Flyback and Forward Regulators
voltage and output load transients.
Multiple-output Regulator
Connection Diagrams
Figure 1. 5-Lead (Straight Leads) TO-220 (T) – Top
Figure 2. 5-Lead (Bent, Staggered Leads) TO-220
View
(T) – Top View
See Package Number KC
See Package Number NDH0005D
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1999–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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