BYD BF1551 For 5V2A手机充电器方案.pdf

BF1551 For 5V2A Charger Design BF1551 for High Efficiency Charger Design:(AC Input 90-264Vac,Output 5V 2A,No-Load Standby Power 100mW, Meet “Europe COC Tier 2 ”Efficiency)1. Introduction………………………………………………….…………….......................................22. Design Features……………………………………………………..................................................33. Power Supply Design Specification……………….…………………………………………….44. Schematic…………………………………………………………………………………………………....55. PCB Layout………………………………………..……………………………………………………….....66. Bill of Materials……………………………..…………………………….......................................77. Transformer Drawing…………………………………………………...………………………......88. Efficiency…………………………………….…………………………..…….......................................99. CV and CC Regulation………….………….………………………...........................................1010. Output Ripple Voltage…………………………………………………………………………….1111. Turn-on Delay Time ……………..………….…………………………………………………..1212. Output Rise Time….…………………………..…………………………………………………..1313. Dynamic Load Response ……………..……………………………………………………..1414. MoU …………………………….………………..…………………………….…………………………1515. Common Mode Noise…..……………..……………………………...…………………………1616. Thermal Test…………………………………....…………………………………………………...1717. Conducted EMI …….………………..………………………………………………………………..1818. Radiated EMI ………………………..………………………………………………………….......19 Table of Contents -1- 1. Introduction This document provides a reference design for a universal AC input, 5V 2A isolatedfly-back adapter. For this design the BF1551 is used. It contains the completespecification of the power supply, a detailed circuit diagram and PCB layout, theentire bill of materials required to build the power supply, drawing of the powertransformer, and test data of the most important performance. -2-Figure 1 Circuit Board Photograph 2. Design Features ?AC input range 90-264Vac ? DC output 5V 2A ? Meet “100mW” no-load standby power consumption requirement ?Meet “Europe COC Tier 2” Efficiency requirement at end of USB ?Max