The LinkSwitch™-CV family is a highly integrated monolithic switching IC designed for off-line power supplies up to 17 W. Ideally suited for DVD player and Set-top box applications, LinkSwitch-CV provides constant voltage without using an optocoupler or secondary feedback circuitry. ON/OFF control optimizes efficiency across load and line, while meeting no-load and power supply efficiency standards. Each member of the family has a high-voltage power MOSFET and its controller integrated onto the same die. 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 components. 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 the dissipation in the MOSFET, the transformer and the output diode during overload, output short-circuit and open-loop conditions, while the auto-recovering hysteretic thermal shutdown function disables MOSFET switching during a thermal fault. Power Integrations’ EcoSmart™ technology enables supplies designed around the LinkSwitch-CV family members to consume <200 mW of no-load power at 230 VAC without an external bias circuit and down to below <70 mW with a low cost bias circuit. This simplifies meeting harmonized energy efficiency standards.

LinkSwitch™-CV系列是高度集成的单片开关IC，设计用于高达17 W的离线电源。LinkSwitch-CV非常适合DVD播放器和机顶盒应用，提供恒定电压而无需使用光耦合器或次级反馈电路。开/关控制可优化负载和线路的效率，同时满足空载和电源效率标准。该系列的每个成员都有一个高压功率MOSFET及其控制器集成在同一芯片上。内部启动偏置电流来自连接至DRAIN引脚的高压电流源，从而无需外部启动组件。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，输出短路和开环条件下限制MOSFET，变压器和输出二极管的功耗，而自动恢复迟滞热关断功能可在发生热故障时禁用MOSFET的开关。 Power Integrations的EcoSmart™技术使围绕LinkSwitch-CV系列成员设计的电源在不使用外部偏置电路的情况下，在230 VAC时可消耗<200 mW的空载功率，而在使用低成本偏置电路时可降至<70 mW以下。这简化了达到协调一致的能效标准的过程。