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LM2576BT

更新时间： 2024-02-03 20:54:34
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关式稳压器或控制器电源电路开关式控制器局域网
页数 文件大小 规格书
8页 92K
描述
52kHz Simple 3A Buck Voltage Regulator

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LM2576BT 技术参数

是否Rohs认证： 符合生命周期：Active
包装说明：TO-263,Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
Factory Lead Time：7 weeks风险等级：1.58
其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 1.23V TO 37V模拟集成电路 - 其他类型：SWITCHING REGULATOR
最大输入电压：40 V最小输入电压：4 V
标称输入电压：12 VJESD-30 代码：R-PSSO-G5
JESD-609代码：e3长度：10.287 mm
湿度敏感等级：1功能数量：1
端子数量：5最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：7.5 A
封装主体材料：PLASTIC/EPOXY封装代码：TO-263
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：245认证状态：Not Qualified
座面最大高度：4.59 mm表面贴装：YES
切换器配置：BUCK最大切换频率：63 kHz
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn) - annealed
端子形式：GULL WING端子节距：1.7 mm
端子位置：SINGLE处于峰值回流温度下的最长时间：40
宽度：9.144 mmBase Number Matches：1

LM2576BT 数据手册

 浏览型号LM2576BT的Datasheet PDF文件第2页浏览型号LM2576BT的Datasheet PDF文件第3页浏览型号LM2576BT的Datasheet PDF文件第4页浏览型号LM2576BT的Datasheet PDF文件第5页浏览型号LM2576BT的Datasheet PDF文件第6页浏览型号LM2576BT的Datasheet PDF文件第7页 
LM2576  
52kHz Simple 3A Buck Voltage Regulator  
General Description  
Features  
The LM2576 series of monolithic integrated circuits provide  
all the active functions for a step-down (buck) switching  
regulator.Fixedversionsareavailablewitha3.3V,5V,or12V  
fixed output. Adjustable versions have an output voltage  
rangefrom1.23Vto37V. Bothversionsarecapableofdriving  
a 3A load with excellent line and load regulation.  
• 3.3V, 5V, 12V, and adjustable output versions  
• Voltage over specified line and load conditions:  
Fixed version: ±3% max. output voltage  
Adjustable version: ±2% max. feedback voltage  
• Guaranteed 3A output current  
• Wide input voltage range:  
4V to 40V  
• Wide output voltage range  
1.23V to 37V  
These regulators are simple to use because they require a  
minimumnumberofexternalcomponentsandincludeinternal  
frequency compensation and a fixed-frequency oscillator.  
The LM2576 series offers a high efficiency replacement for  
popular three-terminal adjustable linear regulators. It  
substantially reduces the size of the heat sink, and in many  
cases no heat sink is required.  
• Requires only 4 external components  
• 52kHz fixed frequency internal oscillator  
• Low power standby mode I typically < 200µA  
Q
• 80% efficiency (adjustable version typically > 80%)  
• Uses readily available standard inductors  
• Thermal shutdown and current limit protection  
• 100% electrical thermal limit burn-in  
Astandardseriesofinductorsavailablefromseveraldifferent  
manufacturers are ideal for use with the LM2576 series. This  
feature greatly simplifies the design of switch-mode power  
supplies.  
The feedback voltage is guaranteed to ±2% tolerance for  
adjustable versions, and the output voltage is guaranteed to  
±3% for fixed versions, within specified input voltages and  
outputloadconditions.Theoscillatorfrequencyisguaranteed  
to ±10%. External shutdown is included, featuring less than  
200µA standby current. The output switch includes cycle-by-  
cycle current limiting and thermal shutdown for full protection  
under fault conditions.  
Applications  
• Simple high-efficiency step-down (buck) regulator  
• Efficient pre-regulator for linear regulators  
• On-card switching regulators  
• Positive to negative converter (inverting Buck-Boost)  
• Isolated Flyback Converter using minimum number of  
external components  
• Negative Boost Converter  
Typical Applications  
7V–40V  
Unregulated  
DC Input  
7V–40V  
Unregulated  
DC Input  
+5V, 3A  
Regulated  
Output  
+5V, 3A  
Regulated  
Output  
4
4
Feedback  
L1  
Feedback  
L1  
1
1
LM2576-5.0  
LM2576  
3 5  
Output  
2
Output  
2
+VIN  
+VIN  
100µH  
100µH  
+
+
+
+
R2 3.09k  
R1 1k  
3
5
CIN  
CIN  
100µF  
Gnd On/Off  
Gnd On/Off  
D1  
1N5822  
D1  
1N5822  
COUT  
1000µF  
COUT  
1000µF  
100µF  
Note: Pin numbers are for TO-220 Package  
Note: Pin numbers are for TO-220 Package  
R2  
V
OUT = 1.23 1 +  
( )  
R1  
Fixed Regulator in Typical Application  
Adjustable Regulator in Fixed Output Application  
4-120  
October 1998  
12345678

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