18320771884/0755-82865030何小姐FT838D基于FT838D的5V1AUSB充电器设计方案设计规格总结:1)交流输入电压范围90-264Vac50/60Hz2)直流输出5V/1.0A3)满足能源之星2.0和5级能效的要求并有足够的余量（板端数据）(实测平均效率在PCB板端74.0%以上，能源之星2.0标准是68.17%)4)空载待机功耗小于100mW(实测69mW@230Vac)5)满足EMIEN55022ClassB级的要求，并有足够的余量6)最大的输出纹波小于100mVP-P7)系统批量生产保证输出电压精度在±5%以内，输出电流精度在±5%以内。8)自恢复的短路保护和环路开路保护Page1of1318320771884/0755-82865030何小姐FT838D内容1.规格2.电路图3.DEMO图片4.BOM清单5.变压器规格6.输入/输出特性(效率/待机功耗/纹波测试)7.输出VI特性（VI曲线）8.开机启动延时时间9.关机输出电压维持时间10.输出电压上升时间11.瞬态负载响应12.开关三极管Vce波形13.输出二极管反向电压波形14.输出短路保护15.VCC供电电压范围16.传导EMI17.辐射EMIPage2of1318320771884/0755-82865030何小姐FT838D1.规格DescriptionSymbolMin.Typ.Max.UnitRemark描述符号最小值典型值最大值单位备注Input输入输入电压Vin90264Vac2线频率Fline4750/6063HzP空载功耗100mWVin=230Vacno_loadOutput输出测量输出线端电压输出电压Vo4.755.05.25V(Rcable=300mΩ)输出电流Io01AA测量输出线端数据，Io=1.0A@输出纹波Vripple100mvp-pTa=25℃,20MHz带宽在PCB板端测试，Vin=115Vac，效率Eff74.1575.16%230Vac(Ta=25℃)过流/短路保护Io.max1.162A自恢复打嗝模式Safety&EMI安规与EMIEMIMeetsEN550022B安规DesigntomeetIEC&UL60950环境温度02540℃Page3of1318320771884/0755-82865030何小姐FT838D2.电路图1234DC8DR11RF1D1L1T1+5VD2C7D6R1C3C4R10C1C2D3EE13R7R4-D4D5CR2CL2LR3C4D7+2838DT1Q1BR54BVCCOUT1FB3CSGND5R6R7R8R9C6TitleSizeNumberRevisionAABDate:9-Nov-2012SheetofFile:H:\techsupport\AE内部资料\838NB\838D(2).DrawnDDBBy:12343.DEMO图片顶视图底视图Page4of1318320771884/0755-82865030何小姐FT838D4.BOM清单Page5of1318320771884/0755-82865030何小姐FT838D5．变压器规格Page6of1318320771884/0755-82865030何小姐FT838D6.输入与输出特性*注:所测数据为PCB板端数据@25℃负载Vin(Vac)Iout(A)Pin(W)Vout(Vdc)纹波(mV)效率(%)900.0365.0968-1150.0405.1076-002300.0695.0972-2640.0885.1073-901.725.08472.671151.6485.08075.851/40.252301.745.08271.852641.85.057570.1903.455.079273.51153.325.068576.21/20.52303.415.068074.22643.555.089271.2905.3825.1510271.81155.0885.1410075.763/40.752305.125.139875.152645.285.1811273.57907.395.2711071.3511