电子元件资料TFC719

TFC719高性能电流模式PWM开关电源控制器1TianfengScience&.TechnologyCo.,Ltd.DataSheetTFC719【开关电源控制器集成电路】PDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.目录··········································································································2概述、特点、应用领域···············································································3内部电路参考框图······················································································4引脚功能描述·····························································································4极限参数····································································································5推荐工作条件·····························································································5电气参数····································································································6原理描述····································································································7电参数定义································································································9应用信息····································································································9典型应用电路····························································································13元器件清单································································································15变压器绕制································································································16测试数据···································································································17主要测试点波形·························································································18热阻与结温参数·························································································20封装尺寸图·································································································21联系信息····································································································22PDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.概述高性能电流模式PWM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，峰值输出功率更可达8W。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内部的启动电路可利用功率开关管本身的放大作用完成启动，很大程度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BE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，达到800V的高压，这保证了功率管的耐压裕度。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800V高压功率开关管l锁存脉宽调制，逐脉冲限流检测l低输出降频功能，待机功耗低于0.25Wl内建比例驱动与反馈补偿功能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，减少启动电阻的功耗l极少的外围元器件l低启动电流和低工作电流lVCC过压自动限制l宽电压连续输出功率可达5W，峰值输出功率可达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）PDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.内部电路参考框图图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震荡电容脚，外接定时电容3GND接地脚4FB反馈脚5VCC供电脚6OEOE脚，应用中悬空*7，8OC输出脚，接开关变压器*:PCBLayout时应将Pin6悬空处理，并与Pin7之间保留1mm以上的安全距离，避免产生放电现象。PDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.极限参数供电电压VCC·······················································································16V启动输入电压·························································································16V引脚输入电压··············································································VCC+0.3VOC集电极承受电压··································································－0.3-850V峰值开关电流···················································································300mA总耗散功率···················································································1000mW工作温度范围·············································································-40---＋125℃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--750V峰值开关电流--250mA定时电容270330*680PF对应频率8166*32KHz工作结温125℃PDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.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=10mA800--V开通饱和压降Ioc=250mA--1V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℃250270290mA振荡器部分项目测试条件最小典型最大单位振荡频率Ct=330PF596673KHz频率随电压变化率Vcc=5.5-9V--1%频率随温度变化率Ta=0-85℃--1%前沿消隐时间Ct=330PF-800-ns反馈部分项目测试条件最小典型最大单位输入阻抗上拉电流-0.500.60mA下拉电阻-23-KΩ电源抑制比Vcc=5.5-9V-6070dB电流取样部分项目测试条件最小典型最大单位电流取样门限0.550.600.65V防上限电流0.250.270.29A电源抑制比-6070dB传输延时-150250nsPDFcreatedwithFinePrintpdfFactorytrialversion&.TechnologyCo.,Ltd.脉宽调制部分项目测试条件最小典型最大单位最大占空比535761%最小占空比--3.5%电源电流项