ZHCSCW5B
August 2014 – September 2017
LM43600
PRODUCTION DATA.
1
特性
2
应用
3
说明
4
简化电路原理图
5
辐射发射图VIN = 12V,VOUT = 3.3V,FSW= 500kHz,IOUT = 0.5A
5
修订历史记录
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Requirements
7.7
Switching Characteristics
7.8
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Fixed Frequency Peak Current Mode Controlled Step-Down Regulator
8.3.2
Light Load Operation
8.3.3
Adjustable Output Voltage
8.3.4
Enable (ENABLE)
8.3.5
VCC, UVLO and BIAS
8.3.6
Soft Start and Voltage Tracking (SS/TRK)
8.3.7
Switching Frequency (RT) and Synchronization (SYNC)
8.3.8
Minimum ON-Time, Minimum OFF-Time and Frequency Foldback at Dropout Conditions
8.3.9
Internal Compensation and CFF
8.3.10
Bootstrap Voltage (BOOT)
8.3.11
Power Good (PGOOD)
8.3.12
Overcurrent and Short-Circuit Protection
8.3.13
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Stand-by Mode
8.4.3
Active Mode
8.4.4
CCM Mode
8.4.5
Light Load Operation
8.4.6
Self-Bias Mode
9
Applications and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Custom Design With WEBENCH® Tools
9.2.2.2
Output Voltage Setpoint
9.2.2.3
Switching Frequency
9.2.2.4
Input Capacitors
9.2.2.5
Inductor Selection
9.2.2.6
Output Capacitor Selection
9.2.2.7
Feedforward Capacitor
9.2.2.8
Bootstrap Capacitors
9.2.2.9
VCC Capacitor
9.2.2.10
BIAS Capacitors
9.2.2.11
Soft-Start Capacitors
9.2.2.12
Undervoltage Lockout Setpoint
9.2.2.13
PGOOD
9.2.3
Application Performance Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.1.1
Compact Layout for EMI Reduction
11.1.2
Ground Plane and Thermal Considerations
11.1.3
Feedback Resistors
11.2
Layout Example
12
器件和文档支持
12.1
开发支持
12.1.1
使用 WEBENCH® 工具创建定制设计
12.2
接收文档更新通知
12.3
社区资源
12.4
商标
12.5
静电放电警告
12.6
Glossary
13
机械、封装和可订购信息
1
特性
33µA 稳压静态电流
可在轻负载条件下实现高效率(DCM 和 PFM)
符合 EN55022/CISPR 22 电磁干扰 (EMI) 标准
集成同步整流
可调频率范围:200kHz 至 2.2MHz(默认值为 500kHz)
与外部时钟频率同步
内部补偿
与几乎任一陶瓷、固态电解、钽和铝质电容器组合一同工作时保持稳定
电源正常状态标志
软启动至预偏置负载
内部软启动:4.1ms
可由外部电容器延长的软启动时间
输出电压跟踪功能
程序系统欠压闭锁 (UVLO) 精确使能
具有断续模式的输出短路保护
过热关断保护
使用 LM43600 并借助
WEBENCH® 电源设计器
创建定制设计
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