描述 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.

特性 Features

? 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