CX7181-05- 5V2.1A适配器方案

                                                      整体方案描述：

                                                 1.AC输入范围90—264Vac

                                                 2.DC输出5V,2.1A

                                                 3. OVP>5.8V

                                                 4.满足＂EPA_2.0＂能效要求

                                                 5.最大纹波＜80Mvp-p

                                                            图1.Demo实物图

                                           特性：

•                                      全电压范围内±%的恒压精度、±%的恒流精度
•                                      使用原边反馈控制，可省去光耦与TL431
•                                      外部可设定恒流值与输出功率
•                                      内置原边反馈恒流控制
•                                      内建自适应峰值电流控制
•                                      内建原边电感补偿
•                                      可外部调整的线压降补偿
•                                      上电软启动
•                                      内置前沿消隐(LEB)功能
•                                      逐周期限流保护（OCP）
•                                      欠压保护（UVLO）、过压保护（OVP）、VDD 电压箝位保护

          一、规格与参数

       二、原理图 

                  2.1  BOM清单

                 2.2 Demo变压器示意图

             2.2.1  SCHEMATIC:

             2.2.2  Winding process：

               2.2.3  Electrical characteristic：(AT 25℃)

              1.INDUCTANCE:  (Lp,f=1KHz, 1V)      Lp（2-1)=1.2mH±5%  Ls(漏感)<5% lp="" strong="">

              2. HI-POT：P -  S:       AC 3.75KV/5mA/50Hz  5 Sec  

                                    P,S – C:     AC 1.5KV/5mA/50Hz  5 Sec

               2.2.4  MAIN MATERIAL LIST：

              2.3  Demo板结构示意图

            2.4  Demo板印制图

                                TOP View

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           三、测试数据

                  3.1 效率测试