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LM2574HVM-ADJ датащи(PDF) 1 Page - Texas Instruments

номер детали LM2574HVM-ADJ
подробное описание детали  LM2574/LM2574HV SIMPLE SWITCHER??0.5A Step-Down Voltage Regulator
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LM2574HVM-ADJ датащи(HTML) 1 Page - Texas Instruments

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LM2574, LM2574HV
www.ti.com
SNVS104C – JUNE 1999 – REVISED APRIL 2013
LM2574/LM2574HV SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator
Check for Samples: LM2574, LM2574HV
1
FEATURES
DESCRIPTION
The LM2574 series of regulators are monolithic
23
3.3V, 5V, 12V, 15V, and Adjustable Output
integrated circuits that provide all the active functions
Versions
for a step-down (buck) switching regulator, capable of
Adjustable Version Output Voltage Range,
driving a 0.5A load with excellent line and load
1.23V to 37V (57V for HV version) ±4% Max
regulation. These devices are available in fixed output
Over Line and Load Conditions
voltages of 3.3V, 5V, 12V, 15V, and an adjustable
output version.
Specified 0.5A Output Current
Wide Input Voltage Range, 40V, up to 60V for
Requiring
a
minimum
number
of
external
HV Version
components, these regulators are simple to use and
include internal frequency compensation and a fixed-
Requires Only 4 External Components
frequency oscillator.
52 kHz Fixed Frequency Internal Oscillator
The
LM2574
series
offers
a
high-efficiency
TTL Shutdown Capability, Low Power Standby
replacement
for
popular
three-terminal
linear
Mode
regulators. Because of its high efficiency, the copper
High Efficiency
traces on the printed circuit board are normally the
only heat sinking needed.
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit
A standard series of inductors optimized for use with
Protection
the LM2574 are available from several different
manufacturers. This feature greatly simplifies the
design of switch-mode power supplies.
APPLICATIONS
Other features include a specified ±4% tolerance on
Simple High-Efficiency Step-Down (Buck)
output voltage within specified input voltages and
Regulator
output load conditions, and ±10% on the oscillator
Efficient Pre-Regulator for Linear Regulators
frequency. External shutdown is included, featuring
On-Card Switching Regulators
50
μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
Positive to Negative Converter (Buck-Boost)
thermal shutdown for full protection under fault
conditions.
Typical Application (Fixed Output Voltage Versions)
Note: Pin numbers are for 8-pin PDIP package.
Figure 1.
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 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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