ZHCSBB6H April 2012 – November 2017 LM34927
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
-
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 Applications
- 8.2.1
Application Circuit: 20-V to 95-V Input and 10-V, 300-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
- 8.2.1.3 Application Curves
- 8.2.1
Application Circuit: 20-V to 95-V Input and 10-V, 300-mA Output Isolated Fly-Buck Converter
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
- DDA|8
订购信息
8.2.1.2.2 Total IOUT
The total primary referred load current is calculated by multiplying the isolated output loads by the turns ratio of the transformer as shown in Equation 10.
Equation 10. 