GR8763LED驱动芯片技术资料-GR8763Ap

2010.03Ver.BCopyrightGrenergyOPTO,Inc.与功率因子调整功能的转换器，亦为广泛使用于电源产品的一种架构。节能照明灯可较传统照明灯有效率的将电源转换为光，良好的电光转换效率更须搭配良好的前级电源转换效率以提高灯具整体的电光转换效率，本文将阐述使用GR8763设计高功率因子(P.F)与高转换效率之单级反激式交-直流电源转换器LED驱动电路结果。1电压放大器输入2电压放大器输出3乘法器输入PIN4MOSFETD-S电流侦测PIN5ZCD侦测PIN6接地7MOSFETGATE控制8芯片电源输入GR8763功能简介功能简介功能简介功能简介GR8763为高性能之临界导通模式(CriticalConductionMode)PFC控制IC，具有下列特性：
于CRM模式中使用零电流侦测(ZCD)
低芯片启动电流(小于30uA)
动态与静态IC过电源保护(OVP)
芯片电源欠压保护(UVLO)与迟滞(Hysteresis)功能
MOSFET过电流保护(OCP)
防止MOSFET启动瞬间突波干扰电流保护机制(Leading-EdgeBlankingtime,LEB)
MOSFET-Gate驱动电压箝制(17V)功能
芯片进入保护模式计时自动重新启动功能(Autorestart)
内建高性能乘法器(Multiplier)以降低系统总谐波失真(THD)内部功能方块图内部功能方块图内部功能方块图内部功能方块图应应应应用用用用GR8763于于于于LED驱驱驱驱动动动动之之之之全全全全范范范范围围围围输输输输入电入电入电入电压压压压高高高高功率功率功率功率因子因子因子因子单单单单级级级级反反反反激激激激式式式式交交交交-直直直直流流流流电电电电源源源源转转转转换换换换器器器器(ApplicationInformationforUniversalSingle-StageFlybackConverterUsingGR8763forLEDlighting)2010.03Ver.BCopyrightGrenergyOPTO,Inc.为系统欲设计之系统规格，本文将以此规格做为设计标准：表-1系统规格参数规格值输入功率7.5W输出功率6.6W输入电压范围90~264VAC输出电压20V输出电流330mA功率因子,PF0.9效率,η80%最大切换频率70KHzLED规格1W/350mA/3.2V6pcs环境温度25℃参数验证参数验证参数验证参数验证本系统可经由数据量测来验证系统性能的优劣；以下将量测几个数据作为验证系统性能判断依据：1.系统转换效率(Convertingefficiency)2.功率因子(PowerFactor)3.输入电压与输出电流关系图4.系统启动5.输入电压对系统输出电流的影响6.输入电压、SwitchingMOSFETVDS、IDS与二次侧整流二极管电流(ID)。2010.03Ver.BCopyrightGrenergyOPTO,Inc.(AC)606570758085908590110115130150180220230250264Vin(AC)Efficiency(%)图1转换效率与输入电压关系图PowrFactorV.SVin(AC)90929496981008590110115130150180220230250264Vin(AC)PowerFactor(%)图2功率因子与输入电压关系曲线图OutputcurrentV.SVin(AC)2803003203403603808590110115130150180220230250264Vin(AC)O/Pcurrent(A)图3输出电流与输入电压关系曲线图图4系统启动时之输出电压与电流波形图(上图)VIN=110VAC/60Hz(下图)VIN=220VAC/50HzOutputvoltage:5V/DIVOutputcurrent:100mA/DIVOutputvoltage:5V/DIVOutputcurrent:100mA/DIV图5输出电压与电流波形图(上图)VIN=110VAC/60Hz(下图)VIN=220VAC/50Hz2010.03Ver.BCopyrightGrenergyOPTO,Inc.电压、电流、FRD电流波形图2010.03Ver.BCopyrightGrenergyOPTO,Inc.电路板线路布局注意事项电路板线路布局注意事项电路板线路布局注意事项电路板线路布局注意事项1.高频切换电流回路流经C3正极变压器MOSFETR22C3负极，此为电路中最大噪声源，此回路零件应尽量靠近以缩短回路路径线长及面积，同时并远离小讯号回路与GR8763芯片，且GND1之间的联机需要短、宽、直，MOSFET如有使用散热片应将散热片接至一次侧的GND1。2.C8应尽量靠近GR8763的VCCpin和GNDpin，且GND2联机尽量短并靠近GR8763GNDpin。3.GND2最后由C3GND1汇入。4.ESD放电路径由二次侧透过变压器的寄生电容进入主绕组及辅助绕组，有一路径由GND2进入GND1最后进入主电源系统；电路中需提供放电路径，避免高压电荷伤及系统中零组件与芯片。另外变压器的一次侧与二次侧间应跨接一个Y1电容以提供放电路径，此Y1电容跨在C3GND1到次级测GND较理想。图图图图72010.03Ver.BCopyrightGrenergyOPTO,Inc.材料规格材料规格材料规格材料规格变压器绕线资料阶层(layer)启始连接PIN中止连接PIN圈数材料规格1PIN1PIN21320.2mm2--1胶带W：0.8mm3-PINShielding1铜箔4--1胶带W：0.8mm5PIN7PIN8480.3mmtripple6--1胶带W：0.8mm7PIN4PIN3360.15mm8--1胶带W：0.8mmLP---1.5mHBoobin---8PINEE16-VCore---EE-162010.03Ver.BCopyrightGrenergyOPTO,Inc.零组件表零组件表零组件表零组件表ItemDescriptionQ'tyLocationManufacturerTypeBRIDGEDIODE0.8A/600VMB6SMDI1BD1亚昕SMDMMLC470P/500VX7R10%12061C1SMDMMLC470P/50VX7R10%08051C10SMDMMLC12N/50VX7R10%08052C11,C12SMDMMLC2200P/1KVX7R10%12061C4SMDMMLC0.1u/25VX7R10%08053C6,C14,C15SMDMMLC1u/25VX7R10%08051C9SMDFASTDIODE0.3A/75VLL4148MINIMELF1D2DIODES,GSSMDFASTDIODE0.25A/250VBAV103MINIMELF1D3DIODES,GSSMDTRANSISTORNPNMMST2222SOT-230.6A/40V2Q2,Q3DIODES,ROHMSMDRESISTOR47R12061/4W5%1R1SMDRESISTOR10K08051/8W1%2R11,R24SMDRESISTOR68K08051/8W1%1R13SMDRESISTOR10R08051/8W5%1R15SMDRESISTOR1K08051/8W1%2R16,R29SMDRESISTOR510R08051/8W1%1R17SMDRESISTOR2K08051/8W1%2R18,R26SMDRESISTOR5.1K08051/8W1%3R19,R23,R27SMDRESISTOR0R08051/8W5%2R2,R14SMDRESISTOR24K08051/8W1%1R21SMDRESISTOR100K08051/8W1%1R25SMDRESISTOR15K08051/8W1%1R28SMDRESISTOR150K12061/4W5%2R3,R10SMDRESISTOR3K08051/8W1%1R30SMDRESISTOR40.2K08051/8W1%1R4SMDRESISTOR200K12061/4W5%2R5,R6SMDRESISTOR1R212061/4W1%2R7,R8SMDRESISTOR1M12061/4W5%2R9,R12SMDRESISTOR0R12061/4W5%1ZD1SMDPFCICPFCICGR8763SOP-81U1grenergySMDREGULATORSTTSM1052SOT23-61U3STSMDZENERDIODE12V1/2W5%MINIMELF1ZD2ROHMSMDZENERDIODE16V1/2W5%MINIMELF1ZD3ROHMSMDECCAP220u/35V10*13105℃NCCKY1C2NCCDIPXCAPX10.1u/300V12.8*5.8*12P:10mm2C3,CX1晟通DIP2010.03Ver.BCopyrightGrenergyOPTO,Inc.*11105℃NCCKME1C5NCCDIPECCAP100u/25V6.3*11105℃NCCKY1C8NCCDIPY1CAPY11KP/250VP:10mm1CY1TDK,FAIRCHILDDIPFASTDIODE3A/400VER304DO-201立式1D1PANJITDIPGENERALDIODE1N40071A/1KVDO-41立式1D4PANJITDIPFUSETIMELAG2A/250V3.9*11mmPIGTAILPTU0021F1功得DIPINDUCTORDR8*100.3mm1L1DIPINDUCTORUU9.8A100.3mm1L2DIPMOSFETFQPF2N60C2A/600V4.7OHMTO-220F1Q1FAIRCHILDDIPMOFRESISTORMOF1.1R/1W立式1R22DIPTRANSFORMEREE-161.15mH5%0.2mm*132Ts1T1DIPOPTOCOUPLLERSHARPP