Power Integrations LinkSwitch－XT2系列低功耗电源参考设计RDR－736

Power Integrations公司的LinkSwitch-XT2系列是能效低功耗电源离线开关器,集成了725V/900V功率MOSFET,振荡器,简化ON/OFF控制方案,高压开关电流源,频率抖动,逐个周期的电流限制和热关断电路.起动和工作功率直接从DRAIN引脚获得,从而不需要偏压线圈和相关电路.LinkSwitch-XT2系列把高压功率MOSFET开关和电源控制器组合在同一器件.和通常的PWM控制器不同,LinkSwitch-XT2系列采用简化的ON/OFF控制来调整输出电压.其控制器包括振荡器,反馈(检测和逻辑)电路,5.0V稳压器,BYPASS引脚欠压电路,超温保护,线路和输出过电压保护,频率抖动,限流电路,前沿消隐和高压功率MOSFET.器件还集成了其它电路用来自动重起.LinkSwitch-XT2系列主要用在反激转换器和家用电器,工业系统和计量仪表的电源.本文介绍了LinkSwitch-XT2系列产品亮点,功能框图,应用电路和采用LNK3696P的7W非隔离反激转换器参考设计RDR-736主要指标和特性,电路图,材料清单和PCB设计图.

Energy Efficient, Low Power Off-Line Switcher IC With Integrated System Level Protection

LinkSwitch™-XT2 incorporates a 725 V / 900 V power MOSFET,oscillator, simple ON/OFF control scheme, a high-voltage switchedcurrent source, frequency jittering, cycle-by-cycle current limit andthermal shutdown circuitry onto a monolithic IC. The start-up andoperating power are derived directly from the DRAIN pin, eliminatingthe need for a bias winding and associated circuitry.

LinkSwitch-XT2 IC combines a high-voltage power MOSFET switchwith a power supply controller in one device. Unlike conventionalPWM (pulse width modulator) controllers, LinkSwitch-XT2 ICs usea simple ON/OFF control to regulate the output voltage. The

LinkSwitch-XT2 controller consists of an oscillator, feedback (senseand logic) circuit, 5.0 V regulator, BYPASS pin undervoltage circuit,over-temperature protection, line and output overvoltage protection,frequency jittering, current limit circuit, leading edge blanking and ahigh-voltage power MOSFET. The LinkSwitch-XT2 incorporatesadditional circuitry for auto-restart.

LinkSwitch-XT2系列产品亮点:

Easy to Design

• Lowest...