ZHCS547K
January 2010 – February 2018
LM27402
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
典型应用电路
4
修订历史记录
5
Pin Configuration and Functions
Pin Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Switching Characteristics
6.8
Typical Performance Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Wide Input Voltage Range
7.3.2
UVLO
7.3.3
Precision Enable
7.3.4
Soft-Start and Voltage Tracking
7.3.5
Output Voltage Setpoint and Accuracy
7.3.6
Voltage-Mode Control
7.3.7
Power Good
7.3.8
Inductor-DCR-Based Overcurrent Protection
7.3.9
Current Sensing
7.3.10
Power MOSFET Gate Drivers
7.3.11
Pre-Bias Start-up
7.4
Device Functional Modes
7.4.1
Fault Conditions
7.4.1.1
Thermal Protection
7.4.1.2
Current Limit
7.4.1.3
Negative Current Limit
7.4.1.4
Undervoltage Threshold (UVT)
7.4.1.5
Overvoltage Threshold (OVT)
8
Application and Implementation
8.1
Application Information
8.1.1
Converter Design
8.1.2
Inductor Selection (L)
8.1.3
Output Capacitor Selection (COUT)
8.1.4
Input Capacitor Selection (CIN)
8.1.5
Using Precision Enable
8.1.6
Setting the Soft-Start Time
8.1.7
Tracking
8.1.8
Setting the Switching Frequency
8.1.9
Setting the Current Limit Threshold
8.1.10
Control Loop Compensation
8.1.11
MOSFET Gate Drivers
8.1.12
Power Loss and Efficiency Calculations
8.1.12.1
Power MOSFETs
8.1.12.2
High-Side Power MOSFET
8.1.12.3
Low-Side Power MOSFET
8.1.12.4
Gate-Charge Loss
8.1.12.5
Input and Output Capacitor ESR Losses
8.1.12.6
Inductor Losses
8.1.12.7
Controller Losses
8.1.12.8
Overall Efficiency
8.2
Typical Applications
8.2.1
Example Circuit 1
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design With WEBENCH® Tools
8.2.1.3
Application Curves
8.2.2
Example Circuit 2
8.2.3
Example Circuit 3
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.1.1
Power Stage Layout
10.1.2
Gate Drive Layout
10.1.3
Controller Layout
10.1.4
Thermal Design and Layout
10.2
Layout Example
11
器件和文档支持
11.1
器件支持
11.1.1
第三方产品免责声明
11.1.2
开发支持
11.1.2.1
使用 WEBENCH® 工具创建定制设计
11.2
文档支持
11.2.1
相关文档
11.3
接收文档更新通知
11.4
社区资源
11.5
商标
11.6
静电放电警告
11.7
Glossary
12
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
RUM|16
MPQF223A
PWP|16
MPDS371A
散热焊盘机械数据 (封装 | 引脚)
RUM|16
QFND453A
PWP|16
PPTD288A
订购信息
zhcs547k_oa
zhcs547k_pm
1
特性
3V 至 20V 的宽输入电压范围
基于电感直流电阻 (DCR) 或分流电阻的过流保护
0.6V 基准电压,在 –40°C 至 125°C 整个结温范围内的精度为 ±1% FB
200kHz 至 1.2MHz 的开关频率
输出电压高达输入电压的 95%
集成高电流金属氧化物半导体场效应晶体管 (MOSFET) 驱动器
内部 VDD 偏压电源低压降 (LDO) 子稳压器
外部时钟同步
通过外部电容器进行可调软启动
预偏置启动功能
电源跟踪
支持线路前馈的电压模式控制
开漏电源正常指示器
具有迟滞功能的精密使能端
16 引脚 HTSSOP 和 WQFN 封装
使用 LM27402 并借助
WEBENCH® 电源设计器
创建定制设计