BYD BF1550 5V1A 手机充电器方案.pdf

BF1550 For 5V1A Charger Design BF1550 for High efficiency Charger Design AC Input 90 264Vac Output 5V 1A No Load Standby Power 75mW Meet COC Tier 2 efficiency 1 Introduction 2 2 Design Features 3 3 Power Supply Design Specification 4 4 Schematic 5 5 PCB Layout 6 6 Bill of Materials 7 7 Transformer Drawing 8 8 Efficiency 9 9 CV and CC Regulation 10 10 Output Ripple Voltage 11 11 Turn on Delay Time 12 12 Output Rise Time 13 13 Dynamic Load Response 14 14 MoU 15 15 Common Mode Noise 16 16 VceWaveform 17 17 Thermal Test 18 18 Conducted EMI 19 19 Radiated EMI 20 Table of Contents 1 1 Introduction This document provides a reference design for a universal AC input 5V 1A isolated fly back adapter For this design the BF1550 is used It contains the complete specification of the power supply a detailed circuit diagram and PCB layout the entire bill of materials required to build the power supply drawing of the power transformer and test data of the most importantperformance 2 Figure 1 Circuit Board Photograph 2 Design Features AC input range 90 264Vac DC output 5V 1A Meet 75mW no load standby power consumption requirement Meet COC Tier 2 Efficiency requirement at end of USB Max ripple 80mV Meet USB3 0 Dynamic Load Response Requirement 3 3 Power Supply Design Specification The table below represents the minimum acceptable performance of the design SymbolMinTypeMaxUnitsComment Vin90 264Vac f4750 6063Hz 75mW230Vac Output VoltageVout cv4 7555 25VMeasured at end of USB Output CurrentIout cv0 1 2A Output VoltageVout cc2 V Output CurrentIout cc1 1 2A Vripple 80mV Measured at end of USB Iout 1A 20MHz Bandwidth Pout 5 W Iout max 1 2AAuto restart 73 77 Measured at end of USB Vin 115Vac 3 Duty Cycle 50 2 Frequency 100Hz 4 Slew Rate 0 1A us 15 14 MoU Test Conditions 1 Vin 230Vac 50Hz 2 Load 10R Resistive Load 3 The Length of Output DC Cable 1M EPS Switching Frequency Component V pp 920mV 15 Common Mode Noise 16 Test Conditions 1 Vin 230Vac 50Hz 2 Load 10R Resistive Load 3 The Length of Output DC Cable 1M V pp 66 9dB 18 Test Conditions Vin 264Vac 47Hz Io 1A Test Result Vpeak 618V 16 Vce Waveform 17 Thermal Test 18 Item Iout 1A Vin 90Vac T Tr IC1 BF1550 10272 Transformer Wire T1 EE13 93 163 1 Transformer Core T1 EE13 9060 Schottky Diode D7 S34BL 8757 Ambient Temperature30 Note The UUT is assembled with case and placed in a temperature chamber 18 Conducted EMI 19 Vin 230Vac 50Hz Neutral Amplitude dBuV