ZHCSD58G
June 2012 – November 2017
LM34925
PRODUCTION DATA.
1
特性
2
应用
3
说明
Device Images
典型应用原理图
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
Switching Characteristics
6.7
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Control Overview
7.3.2
VCC Regulator
7.3.3
Regulation Comparator
7.3.4
Overvoltage Comparator
7.3.5
On-Time Generator
7.3.6
Current Limit
7.3.7
N-Channel Buck Switch and Driver
7.3.8
Synchronous Rectifier
7.3.9
Undervoltage Detector
7.3.10
Thermal Protection
7.3.11
Ripple Configuration
7.3.12
Soft Start
7.4
Device Functional Modes
8
Application and Implementation
8.1
Application Information
8.2
Typical Application
8.2.1
Application Circuit: 20-V to 95-V Input and 10-V, 100-mA Output Isolated Fly-Buck Converter
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Transformer Turns Ratio
8.2.1.2.2
Total IOUT
8.2.1.2.3
RFB1, RFB2
8.2.1.2.4
Frequency Selection
8.2.1.2.5
Transformer Selection
8.2.1.2.6
Primary Output Capacitor
8.2.1.2.7
Secondary Output Capacitor
8.2.1.2.8
Type III Feedback Ripple Circuit
8.2.1.2.9
Secondary Diode
8.2.1.2.10
VCC and Bootstrap Capacitor
8.2.1.2.11
Input Capacitor
8.2.1.2.12
UVLO Resistors
8.2.1.2.13
VCC Diode
8.2.2
Application Curves
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
器件和文档支持
11.1
文档支持
11.1.1
相关文档
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)
DDA|8
MPDS092F
NGU|8
MPDS407A
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcsd58g_oa
zhcsd58g_pm
7.3
Feature Description
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