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THXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHX器件参数表DataSheetTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHX发行日期：2009.11.18文档编号：SPEC202H0911E1版本:ETHX202H【开关电源控制器集成电路】THXMicro-elec.通华芯微电子THXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHXTHX高性能电流模式PWM开关电源控制器南京通华芯微电子有限公司修订版，增加内容，完善参数JamesB2007.9.15增加800V版本,增加EMI波形,修正错误JamesC2008.12.1修正错误JamesD2009.11.18更新徽标JamesE目录概述、特点、应用领域································································································3内部电路参考框图与引脚功能·····················································································4极限参数······················································································································5推荐工作条件··············································································································5电气参数······················································································································5原理描述······················································································································7电参数定义··················································································································8应用信息······················································································································9典型应用电路·············································································································11元器件清单················································································································12变压器绕制················································································································13测试数据····················································································································14主要测试点波形·········································································································15EMI测试波形············································································································18订购信息,热阻与结温·································································································19封装尺寸图················································································································20联系信息····················································································································21高性能电流模式PWM开关电源控制器南京通华芯微电子有限公司控制器。专为高性价比AC/DC转换器设计。在85V-265V的宽电压范围内提供高达5W的连续输出功率。优化的高合理性的电路设计结合高性能价格比的双极型制作工艺，最大程度上节约了产品的整体成本。该电源控制器可工作于典型的反激电路拓扑中，构成简洁的AC/DC转换器。IC内部的启动电路被设计成一种独特的电流吸入方式，可利用功率开关管本身的放大作用完成启动，这显著地降低了启动电阻的功率消耗；而在输出功率较小时IC将自动降低工作频率，从而实现了极低的待机功耗。在功率管截止时，内部电路将功率管反向偏置，直接利用了双极性晶体管的CB高耐压特性，大幅提高功率管的耐电压能力直到700V的高压，这保证了功率管的安全。IC内部还提供了完善的防过载防饱和功能，可实时防范过载、变压器饱和、输出短路等异常状况，提高了电源的可靠性。IC内部还集成了一个2.5V的电压基准，为时钟电路提供精确的供电电压，而时钟频率则可由外部定时电容进行设定。现可提供DIP8的标准封装和满足欧洲标准的环保无铅封装。特点l内置700V(-8V为800V)高压功率开关管，极少的外围器件l锁存脉宽调制，逐脉冲限流检测l低输出降频功能，无输出功耗可低于0.25Wl内建斜坡与反馈补偿功能l独立上限电流检测控制器，实时处理控制器的过流、过载l关断周期发射极偏压输出，提高了功率管的耐压l内置具有温度补偿的电流限制电阻，精确电流限制l内置热保护电路l利用开关功率管的放大作用完成启动，启动电阻的功耗减少10倍以上l极少的外围元器件l低启动和工作电流lVCC过压自动限制l宽电压输出功率可达5W,窄电压输出功率可达8W应用领域l适配器ADAPTOR（如旅行充电器、外置电源盒等）l绿色节能型家电内部电源（如电磁炉、微波炉等）管脚图DIP81234567THX202HOBCTGNDFBVCCOEOCOC8高性能电流模式PWM开关电源控制器南京通华芯微电子有限公司电源管理START-UP启动电流246153CTFBGNDOEOBVCC上限电流触发器-RS50uA热保护+-RRSQQ斜坡电流驱动7OC8OCISVRRISQ1Q2斜坡补偿图1.内部电路方框图引脚功能描述管脚符号管脚定义描述1OB功率管基极，启动电流输入，外接启动电阻2CT振荡电容脚，外接定时电容3GND接地脚4FB反馈脚5VCC供电脚6NCOE脚，内部测试用,应用中悬空*7,8OC输出脚，接开关变压器*:PCBLayout时应将Pin6悬空/PCB开槽处理，并与Pin7之间保留1mm以上的安全距离，避免产生放电现象。高性能电流模式PWM开关电源控制器南京通华芯微电子有限公司···································································································16V引脚输入电压··························································································VCC+0.3VOC集电极承受电压·······································································－0.3-700V/800V峰值开关电流································································································300mA总耗散功率·································································································1000mW工作温度范围·························································································0---＋150℃储存温度范围···················································································－55---＋150℃焊接温度·······························································································＋260℃,10S推荐工作条件项目最小典型最大单位供电电压，VCC4.85.59.0V引脚输入电压-0.3-VccV峰值反向电压--550V峰值开关电流--290mA定时电容270330680PF振荡频率326181KHz工作温度0105℃电气参数（Ta=25℃,Vcc=5.5-7.5V,Ct=330PF）输出部分项目测试条件最小典型最大单位开关管最大耐压Ioc=1mATHX202H-7V700--VTHX202H-8V800--V开通饱和压降Ioc=270mATHX202H-7V--1VTHX202H-8V--1.2V输出关断延时Ioc=270mA300-700nS输出上升时间CL=1nF--75nS输出下降时间CL=1nF--75nS输出限制电流Tj=0-100℃250270290mAOE钳位电压OE=0.001-0.29A-1.5-V参考部分(内部)项目测试条件最小典型最大单位参考输