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LM2576 参数 Datasheet PDF下载

LM2576图片预览
型号: LM2576
PDF下载: 下载PDF文件 查看货源
内容描述: 3A开关型,直流 - 直流降压转换电路稳压压差要求3V ,转换效率: 77-88 %>应用:汽车电子,车载DVD , VCD ,液晶显示器,液晶电视机 [3A 开关型、直流-直流降压转换电路。稳压压差要求3V,转换效率: 77-88% 应用:汽车电子,车载DVD,VCD,液晶显示器,液晶电视机]
分类和应用: 显示器开关电视电子DVD
文件页数/大小: 8 页 / 241 K
品牌: HN [ NANJING HONANO ELECTRONIC CO., LTD. ]
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LM2576/LM2576HV
LM2576/LM2576HV Series
3A Step-Down Switching Regulator
DESCRIPTION
Feb. 2009
The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving 3A 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 LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially
reduces the size of the heat sink, and in some cases no heat sink is required.
A standard series of inductors optimized for use with the LM2576 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 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.
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
Guaranteed 3A 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
APPLICATIONS
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
On-card switching regulators
Positive to negative converter (Buck-Boost)
Negative step-up converters
Power supply for battery chargers
The pin-pin replacement of National Semi. and On
Semi. Lm2576
ORDERING INFORMATION
Temperature
Range
3.3
LM2576S-3.3
LM2576HVS-3.3
LM2576T-3.3
LM2576HVT-3.3
5.0
LM2576S-5.0
LM2576HVS-5.0
LM2576T-5.0
LM2576HVT-5.0
Output Voltage
12
LM2576S-12
LM2576HVS-12
LM2576T-12
LM2576HVT-12
15
LM2576S-15
LM2576HVS-15
LM2576T-15
LM2576HVT-15
ADJ
LM2576S-ADJ
LM2576HVS-ADJ
LM2576T-ADJ
LM2576HVT-ADJ
Package
Type
TO-263
TO-220
PIN CONNECTION
Straight Leads
5-Lead TO-220 (T)
Top View
Bent, Staggered Leads
5-Lead TO-220 (T)
Top View
TO-263 (S)
5-Lead Surface-Mount Package
Top View
LM2576T-XX or LM2576HVT-XX
LM2576T-XX or LM2576HVT-XX
LM2576S-XX or LM2576HVS-XX
地址: 南京市珠江路
88
号,新世界中心
B
4004
室, 邮编:210008
ADD.: RM. 4004,
BLOCK B,
NEW WORLD CENTER,
电话(TEL.):
(86)-25-68853600
NANJING 210008,
CHINA
传真(FAX):
(86)-25-68853600-810
WEB-SITE:
WWW.HN-ELEC.COM
NO. 88 ZHUJIANG ROAD,
1