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LM2576-12BT PDF预览

LM2576-12BT

更新时间： 2024-11-25 05:42:03
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关局域网
页数 文件大小 规格书
8页 92K
描述
52kHz Simple 3A Buck Voltage Regulator

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中文翻译

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LM2576-12BT 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：TO-220, SIP5,.1,67TBReach Compliance Code：not_compliant
风险等级：5.83模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
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-PSFM-T5
JESD-609代码：e0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
标称输出电压：12 V封装主体材料：PLASTIC/EPOXY
封装代码：TO-220封装等效代码：SIP5,.1,67TB
封装形状：RECTANGULAR封装形式：FLANGE MOUNT
峰值回流温度（摄氏度）：240认证状态：Not Qualified
子类别：Switching Regulator or Controllers最大供电电流 (Isup)：10 mA
表面贴装：NO切换器配置：BUCK
最大切换频率：63 kHz技术：BIPOLAR
温度等级：INDUSTRIAL端子面层：Tin/Lead (Sn85Pb15)
端子形式：THROUGH-HOLE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：30
Base Number Matches：1

LM2576-12BT 数据手册

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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

中文翻译

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