LM1575/LM2575/LM2575HV Simple Switcher 1A Step Down Voltage Regulator LM2575SX-ADJ/NOPB
diode rectifier circuit
,bridge rectifier circuit
FEATURES Connection Diagrams
(XX indicates output voltage option.)
• 3.3V, 5V, 12V, 15V, and Adjustable Output
Versions
• Adjustable Version Output Voltage Range,
– 1.23V to 37V (57V for HV Version) ±4%
Max Over
– Line and Load Conditions
• Specified 1A Output Current
• Wide Input Voltage Range, 40V up to 60V for
HV Version
• Requires Only 4 External Components
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby
Mode
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit
Protection
• P + Product Enhancement Tested
APPLICATIONS
• Simple High-Efficiency Step-Down (Buck)
Regulator
• Efficient Pre-Regulator for Linear Regulators
• On-Card Switching Regulators
• Positive to Negative Converter (Buck-Boost)
DESCRIPTION
The LM2575 series of regulators are monolithic
integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
driving a 1A load with excellent line and load
regulation. These devices are available in fixed output
voltages of 3.3V, 5V, 12V, 15V, and an adjustable
output version.
Requiring a minimum number of external
components, these regulators are simple to use and
include internal frequency compensation and a fixed-
frequency oscillator.
The LM2575 series offers a high-efficiency
replacement for popular three-terminal linear
regulators. It substantially reduces the size of the
heat sink, and in many cases no heat sink is
required.
A standard series of inductors optimized for use with
the LM2575 are available from several different
manufacturers. This feature greatly simplifies the
design of switch-mode power supplies.
Other features include a specified ±4% tolerance on
output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator
frequency. External shutdown is included, featuring
50 μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions.
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