Powerint LinkSwitch－TN2 900 V1．44W转换器参考设计DER－737

Power Integrations公司的LinkSwitch™-TN2系列产品是高效率离线开关集成电路,和传统的线性和电容降压器(Capdropper)型解决方案相比,极大地提高了性能.采用高度集成的LinkSwitch-TN2集成电路进行设计,具有更多的灵活性和特性,增加了效率,几乎无所不包的系统级保护和更高的可靠性.器件支持降压,降压-升压和反激转换器拓扑结构.每个器件包括了725V功率MOSFET,振荡器,开/关控制以获得轻负载时的最高效率,用于自偏压的高压开关电流源,频率抖动(降低EMI滤波器复杂性),快速限流,滞后热关断以及输出和输入电压保护电路.工作频率66kHz,待机电流<100 μA,无负载损耗小于30mW,容易满足全球所有能源效率规范要求.主要用在仪表计量,电器,智能LED驱动器和工业控制,以及IOT,家庭和建筑物自动化.本文介绍了LinkSwitch™-TN2系列产品亮点,功能框图和应用电路,以及采用LinkSwitch-TN2 900 V的1.44W非隔离降压转换器参考设计DER-737主要特性和优势,电路图,材料清单和PCB设计图.
The LinkSwitch™-TN2 family of ICs for non-isolated off-line powersupplies provide dramatically improved performance compared totraditional linear or cap-dropper solutions. Designs using the highlyintegrated LinkSwitch-TN2 ICs are more flexible and feature increasedefficiency, comprehensive system level protection and higher reliability.
The device family supports buck, buck-boost and flyback convertertopologies. Each device incorporates a 725 V power MOSFET, oscillator,On/Off control for highest efficiency at light load, a high-voltageswitched current source for self-biasing, frequency jittering, fast(cycle-by-cycle) current limit, hysteretic thermal shutdown, and outputand input overvoltage protection circuitry onto a monolithic IC.
LinkSwitch-TN2 ICs consume very little current in standby resulting inpower supply designs that meet all no-load and standby specificationsworldwide. MOSFET current limit modes can be selected through theBYPASS pin capacitor value. The high current limit level providesmaximum continuous output current while the low level permits usingvery low cost and small surface mount inductors. A full suite ofprotection features enable s...