Switching Regulator SIMPLE SWITCHER 1A Step-Down Voltage Regulator 5-TO-220 -40 to 125

Features of the LM2575-N

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

52kHz 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

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Description of LM2575-N

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.