Datasheet > LM2574N-15

LM2574N-15

更新时间： 2024-11-08 22:22:07

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关光电二极管
页数	文件大小	规格书
24页	642K
描述
SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator

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LM2574N-15 数据手册

June 1999

LM2574/LM2574HV

™

SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator

General Description

Features

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

The LM2574 series of regulators are monolithic integrated

circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 0.5A 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.

n Adjustable version output voltage range, 1.23V to 37V

(57V for HV version) 4% max over line and load

conditions

n Guaranteed 0.5A 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

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation and a fixed-frequency oscillator.

The LM2574 series offers a high-efficiency replacement for

popular three-terminal linear regulators. Because of its high

efficiency, the copper traces on the printed circuit board are

normally the only heat sinking needed.

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

A standard series of inductors optimized for use with the

LM2574 are available from several different manufacturers.

This feature greatly simplifies the design of switch-mode

power supplies.

Applications

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

n Efficient pre-regulator for linear regulators

n On-card switching regulators

Other features include a guaranteed 4% tolerance on out-

n Positive to negative converter (Buck-Boost)

put voltage within specified input voltages and output load

conditions, and 10% on the oscillator frequency. External

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 (Fixed Output Voltage Versions)

DS011394-1

Note: Pin numbers are for 8-pin DIP package.

Patent Pending

™

SIMPLE SWITCHER is a trademark of National Semiconductor Corporation

DS011394

www.national.com

12 3 4 5 6 7...24

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与LM2574N-15相关器件

型号	品牌	获取价格	描述	数据表
LM2574N-15G	ONSEMI	获取价格	0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2574N-3.3	NSC	获取价格	SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regul
LM2574N-3.3	ONSEMI	获取价格	EASY SWITCHER 0.5 A STEP-DOWN VOLTAGE REGULATOR
LM2574N-3.3	TI	获取价格	1.8A SWITCHING REGULATOR, 63kHz SWITCHING FREQ-MAX, PDIP8, DIP-8
LM2574N-3.3/NOPB	TI	获取价格	具有 4 个外部组件的 8V 至 40V、500mA SIMPLE SWITCHER® 降
LM2574N-3.3G	ONSEMI	获取价格	0.5 A, Adjustable Output Voltage, Step−Down Switching Regulator
LM2574N-5	ONSEMI	获取价格	EASY SWITCHER 0.5 A STEP-DOWN VOLTAGE REGULATOR
LM2574N-5.0	NSC	获取价格	SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regul
LM2574N-5.0	TI	获取价格	LM2574/LM2574HV SIMPLE SWITCHERâ¢ 0.5A Step-
LM2574N-5.0/NOPB	TI	获取价格	具有 4 个外部组件的 8V 至 40V、500mA SIMPLE SWITCHER® 降

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