欢迎访问ic37.com |
会员登录 免费注册
发布采购

LM2574M-ADJ 参数 Datasheet PDF下载

LM2574M-ADJ图片预览
型号: LM2574M-ADJ
PDF下载: 下载PDF文件 查看货源
内容描述: SIMPLE SWITCHER⑩ 0.5A降压稳压器 [SIMPLE SWITCHER⑩ 0.5A Step-Down Voltage Regulator]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 24 页 / 642 K
品牌: NSC [ NATIONAL SEMICONDUCTOR ]
 浏览型号LM2574M-ADJ的Datasheet PDF文件第2页浏览型号LM2574M-ADJ的Datasheet PDF文件第3页浏览型号LM2574M-ADJ的Datasheet PDF文件第4页浏览型号LM2574M-ADJ的Datasheet PDF文件第5页浏览型号LM2574M-ADJ的Datasheet PDF文件第6页浏览型号LM2574M-ADJ的Datasheet PDF文件第7页浏览型号LM2574M-ADJ的Datasheet PDF文件第8页浏览型号LM2574M-ADJ的Datasheet PDF文件第9页  
LM2574/LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
June 1999
LM2574/LM2574HV
SIMPLE SWITCHER
0.5A Step-Down Voltage Regulator
General Description
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.
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.
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.
Other features include a guaranteed
±
4% tolerance on out-
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.
Features
n
3.3V, 5V, 12V, 15V, and adjustable output versions
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
n
Uses readily available standard inductors
n
Thermal shutdown and current limit protection
Applications
n
n
n
n
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (Buck-Boost)
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
© 1999 National Semiconductor Corporation
DS011394
www.national.com