LM2578A, LM3578A
www.ti.com
SNVS767E –AUGUST 2000–REVISED APRIL 2013
LM2578A/LM3578A Switching Regulator
Check for Samples: LM2578A, LM3578A
1
FEATURES
DESCRIPTION
The LM2578A is a switching regulator which can
2
• Inverting and Non-Inverting Feedback Inputs
easily be set up for such DC-to-DC voltage
• 1.0V Reference at Inputs
conversion circuits as the buck, boost, and inverting
• Operates from Supply Voltages of 2V to 40V
configurations. The LM2578A features a unique
comparator input stage which not only has separate
• Output Current up to 750 mA, Saturation Less
pins for both the inverting and non-inverting inputs,
than 0.9V
but also provides an internal 1.0V reference to each
• Current Limit and Thermal Shut Down
input, thereby simplifying circuit design and p.c. board
• Duty Cycle up to 90%
layout. The output can switch up to 750 mA and has
output pins for its collector and emitter to promote
design flexibility. An external current limit terminal
APPLICATIONS
may be referenced to either the ground or the V
in
• Switching Regulators in Buck, Boost,
terminal, depending upon the application. In addition,
Inverting, and Single-Ended Transformer
the LM2578A has an on board oscillator, which sets
Configurations
the switching frequency with a single external
capacitor from <1 Hz to 100 kHz (typical).
• Motor Speed Control
• Lamp Flasher
The LM2578A is an improved version of the LM2578,
offering higher maximum ratings for the total supply
voltage and output transistor emitter and collector
voltages.
Connection Diagram
Figure 1. PDIP/SOIC Package
See Package Number D0008A or P0008E
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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, 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.
剩余31页未读，继续阅读
资源评论
