LM1575 National Semiconductor, LM1575 Datasheet

LM1575

Manufacturer Part Number

LM1575

Description

SIMPLE SWITCHER 1A Step-Down Voltage Regulator

Manufacturer

National Semiconductor

Datasheet

1.LM1575.pdf (25 pages)

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LM1575/LM2575/LM2575HV Series

SIMPLE SWITCHER

General 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 avail-

able 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 re-

duces 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 guaranteed

put voltage within specified input voltages and output load

conditions, and

shutdown is included, featuring 50 µA (typical) standby cur-

rent. The output switch includes cycle-by-cycle current limit-

ing, as well as thermal shutdown for full protection under

fault conditions.

Typical Application

Note: Pin numbers are for the TO-220 package.

SIMPLE SWITCHER

is a registered trademark of National Semiconductor Corporation.

10% on the oscillator frequency. External

(Fixed Output Voltage Versions)

4% tolerance on out-

DS011475

1A Step-Down Voltage Regulator

Features

n 3.3V, 5V, 12V, 15V, and adjustable output versions

n Adjustable version output voltage range,

n Guaranteed 1A output current

n Wide input voltage range, 40V up to 60V for HV version

n Requires only 4 external components

n 52 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n High efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

n P

Applications

n Simple high-efficiency step-down (buck) regulator

n Efficient pre-regualtor for linear regulators

n On-card switching regulators

n Positive to negative converter (Buck-Boost)

1.23V to 37V (57V for HV version)

line and load conditions

Product Enhancement tested

DS011475-1

4% max over

www.national.com

May 1999

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