The TOPSwitch™-JX is a highly integrated monolithic off-line switcher IC designed for off-line power supplies. TOPSwitch-JX integrated circuits enable design of power supplies up to 244 W, while providing high efficiency under all load conditions. TOPSwitch-JX also provides very good performance at low load and during standby (no-load) operation. The TOPSwitch-JX family allows the designer to easily meet efficiency requirements for the latest energy-efficiency standards. Innovative and proprietary features enable design of compact and cost effective switching power supplies while reducing overall design cycle time and system cost. The TOPSwitch-JX family also enables the design of power supplies with robust functionality and provides enhanced safety features such as output overvoltage protection, overload power limiting and hysteretic thermal protection. Each member of the family has a high-voltage power MOSFET and its controller combined monolithically. Internal start-up bias current is drawn from a high-voltage current source connected to the DRAIN pin, eliminating the need for external start-up circuitry. The internal oscillator is frequency modulated (jitter) to reduce EMI. In addition, the ICs have integrated functions that provide system-level protection. The auto-restart function limits power dissipation in the MOSFET, the transformer and the output diode during overload, output short-circuit or open-loop conditions. The auto-recovering hysteretic thermal shutdown function also disables MOSFET switching if the junction temperature exceeds safe limits. A programmable undervoltage/overvoltage (UV/OV) detection feature allows glitch free start-up and shutdown of the power supply during line sag or line surge conditions. Power Integrations’ EcoSmart® technology enables supplies designed around the TOPSwitch-JX family to consume less than 100 mW at no-load and maintain constant efficiency over the full line and load range. TOPSwitch-JX family of solutions easily meets energy efficiency standards such as European Code of Conduct, EC EuP and ENERGY STAR.

TOPSwitch™-JX是一款高度集成的单片离线开关IC，专为离线电源而设计。 TOPSwitch-JX集成电路可设计高达244 W的电源，同时在所有负载条件下均能提供高效率。 TOPSwitch-JX在低负载和待机（空载）操作期间也提供了非常好的性能。 TOPSwitch-JX系列使设计人员可以轻松满足最新能源效率标准的效率要求。创新和专有的功能使设计紧凑且具有成本效益的开关电源，同时减少了总体设计周期时间和系统成本。 TOPSwitch-JX系列还支持具有强大功能的电源设计，并提供增强的安全功能，例如输出过压保护，过载功率限制和磁滞热保护。该系列的每个成员都有一个高压功率MOSFET及其控制器单片结合。内部启动偏置电流从连接至DRAIN引脚的高压电流源汲取，从而无需外部启动电路。内部振荡器经过调频（抖动）以降低EMI。此外，IC具有集成功能，可提供系统级保护。自动重启动功能可在过载，输出短路或开环条件下限制MOSFET，变压器和输出二极管的功耗。如果结温超过安全限值，则自动恢复滞后热关断功能还会禁用MOSFET开关。可编程的欠压/过压（UV / OV）检测功能可在线路跌落或线路浪涌条件下无故障启动和关闭电源。 Power Integrations的EcoSmart®技术使围绕TOPSwitch-JX系列设计的电源在空载时的功耗低于100 mW，并在整个线路和负载范围内保持恒定的效率。 TOPSwitch-JX系列解决方案轻松满足能源效率标准，例如欧洲行为准则，EC EuP和ENERGY STAR。