LM2576 45V输入 5V3A输出车充方案( The LM2576 series of regulators ar

　　一,目录
1.产品概述         2.产品特点
3.应用范围                       4.产品封装图
5.电路原理图             6.产品PCB
7.产品BOM                       8.产品PDF文档
9.产品设计概述

二,产品概述(General Description)
    The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step–down switching regulator (buck converter). All circuits of this series are capable of driving a 3.0 A load with excellent line and load regulation.
     These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version.
    These regulators were designed to minimize the number of external components to simplify the power supply design.Standard series of inductors optimized for use with the   2576 are offered by several different inductor manufacturers. Since the LM2576 converter is a switch–mode power supply, its efficiency is significantly higher in comparison with popular
three–terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced
dramatically.
       A standard series of inductors optimized for use with the 2576 are available from several different manufacturers.
      This feature greatly simplifies the design of switch–mode power supplies. The LM2576 features include a guaranteed ±4% tolerance on output voltage within specified input
voltages and output load conditions, and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80 ㎂ (typical) standby current.
     The output switch includes cycle–by–cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

三,.产品特点(Features)
1.)3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
2.)Adjustable Version Output Voltage Range,1.23 to 37 V ±4%
3.)Maximum Over Line and Load Conditions
4.)Guaranteed 3.0 A Output Current
5.)Wide Input Voltage Range
6.)Requires Only 4 External Components
7.)52 kHz Fixed Frequency Internal Oscillator
8.)TTL Shutdown Capability, Low Power Standby Mode
9.)High Efficiency
10.)Uses Readily Available Standard Inductors
11.)Thermal Shutdown and Current Limit Protection

四,应用范围 (Applications)
1.)Simple High–Efficiency Step–Down (Buck) Regulator
2.)Efficient Pre–Regulator for Linear Regulators
3.)On–Card Switching Regulators
4.)Positive to Negative Converter (Buck–Boost)
5.)Negative Step–Up Converters
6.)Power Supply for Battery Chargers

五,产品封装图 (Package)
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六,电路原理图

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七, 产品PCB
(略)

八.产品BOM

编号	型号描述	位号	用量	单位
1	贴片电感68UH D8*8mm	L1	1	PCS
2	电解电容680UF/50V	C1	1	PCS
3	电解电容220UF/16V	C3	1	PCS
4	贴片电容104/50V SMD0805	C4	1	PCS
5	贴片电容104/50V SMD0805	C2	1	PCS
6	3PIN排针间距2.54mm COM3	CON1	1	PCS
7	肖特基二极管IN5822 40V3A	D1	1	PCS
8	降压芯片 LM2596 TO263-5	U1	1	PCS
9	贴片电阻31K SMD0805	R1	1	PCS
10	贴片电阻10K SMD0805	R2	1	PCS
11	PCB板 30501.6mm玻纤板		1	PCS

LM2576 45V输入 5V3A输出 车充方案( The LM2576 series of regulators ar

LM2576 45V输入 5V3A输出车充方案( The LM2576 series of regulators ar