ZHCU578
October 2018
说明
资源
特性
应用
设计图像
1
System Description
1.1
Key System Specifications
2
System Overview
2.1
Block Diagram
2.2
Highlighted Products
2.2.1
TPS92692-Q1
2.3
LM74700
2.4
System Design Theory
2.4.1
Design Procedure
2.4.1.1
Operating Parameters, Duty Cycle
2.4.1.2
Setting the Switching Frequency
2.4.1.3
Inductor Value Calculation
2.4.1.4
Peak Inductor Current
2.4.1.5
Calculating RIS (R9)
2.4.1.6
Minimum Output Capacitance
2.4.1.7
Setting the LED Current
2.4.1.8
Soft-Start Capacitor
2.4.1.9
Overvoltage Protection (OVP)
2.4.1.10
Main N-Channel MOSFET Selection
2.4.1.11
Rectifier Diode Selection
2.4.1.12
Thermal Protection
2.4.2
Designing for Low EMI
2.4.2.1
EMI Performance
2.4.2.2
EMI Filter Design
2.4.2.2.1
Additional EMI Considerations
3
Hardware, Software, Testing Requirements, and Test Results
3.1
Required Hardware and Software
3.2
Testing and Results
3.2.1
Test Setup
3.2.2
Test Results
3.2.2.1
Nominal Operation Waveforms
3.2.2.1.1
Loop Stability Measurements Block Diagram
3.2.2.2
Efficiency and Line Regulation: Done for different power level for Boost (Hi Beam and Lo Beam) or Boost to Battery for Lo Beam only
3.2.2.3
Thermal Scan
4
Design Files
4.1
Schematics
4.2
Bill of Materials
4.3
Layout Prints
4.4
Altium Project
4.5
Gerber Files
4.6
Assembly Drawings
5
Related Documentation
5.1
商标
特性
双模式:
提供远光和近光的升压模式
提供近光的升压到电池模式
CISPR-25 3 类和 5 类 EMI 解决方案
超出 AM 波段的开关频率
扩频调频
可应对热启动和负载突降
连续 LED 电流监控输出
过压保护和输入欠压锁定