ZHCSGG8F
July 2011 – March 2018
LM25118
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
简化原理图
效率与输入电压和输出电流(输出电压 = 12V)
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
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
UVLO
7.3.2
Oscillator and Sync Capability
7.3.3
Error Amplifier and PWM Comparator
7.3.4
Ramp Generator
7.3.5
Current Limit
7.3.6
Maximum Duty Cycle
7.3.7
Soft Start
7.3.8
HO Output
7.3.9
Thermal Protection
7.4
Device Functional Modes
7.4.1
Buck Mode Operation: VIN > VOUT
7.4.2
Buck-Boost Mode Operation: VIN ≊ VOUT
7.4.3
High Voltage Start-Up Regulator
7.4.4
Enable
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Design Requirements
8.2.2
Detailed Design Procedure
8.2.2.1
Custom Design With WEBENCH® Tools
8.2.2.2
R7 = RT
8.2.2.3
Inductor Selection – L1
8.2.2.4
R13 = RSENSE
8.2.2.5
C15 = CRAMP
8.2.2.6
Inductor Current Limit Calculation
8.2.2.7
C9 - C12 = Output Capacitors
8.2.2.8
D1
8.2.2.9
D4
8.2.2.10
C1 – C5 = Input Capacitors
8.2.2.11
C20
8.2.2.12
C8
8.2.2.13
C16 = CSS
8.2.2.14
R8, R9
8.2.2.15
R1, R3, C21
8.2.2.16
R2
8.2.2.17
Snubber
8.2.2.18
Error Amplifier Configuration
8.2.2.18.1
R4, C18, C17
8.2.3
Application Curves
9
Power Supply Recommendations
9.1
Bias Power Dissipation Reduction
9.2
Thermal Considerations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
器件和文档支持
11.1
器件支持
11.1.1
开发支持
11.1.1.1
使用 WEBENCH® 工具创建定制设计
11.2
接收文档更新通知
11.3
社区资源
11.4
商标
11.5
静电放电警告
11.6
Glossary
12
机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
PWP|20
MHTS001G
散热焊盘机械数据 (封装 | 引脚)
PWP|20
PPTD289
订购信息
zhcsgg8f_oa
zhcsgg8f_pm
Device Images
简化原理图
效率与输入电压
和输出电流
(输出电压
= 12V)