Offline Controllers | NCP1205

单端 PWM 控制器，具有 QR 运行和软频率折回

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NCP1205 组合了真正的电流模式控制调制器和去磁化检测器，确保了任何负载/线路条件下的完全非连续导通模式，且具有最小的漏电压开关（准谐振运行，也称为临界导通运行）。由于其内在变频模式 (VFM)，每当输出功率需求消失时，该控制器都会降低恒定峰值电流下的运行频率。这种与自动多谷开关相关联的独特结构保证了无负载条件运行时的最小开关损耗，以及从主电源的最低拉功率。这种最新定位使得 NCP1205 成为国际能源机构 (IEA) 针对待机电源的下一个推荐备选产品。内部高电压电流源为 Vcc 电容器提供了可靠的充电路径，可确保洁净和短启动序列，而不会造成一经关断的能效下降。最后，利用过流故障保护电路 (OCP) 实现连续反馈信号的监测，最终的设计可靠耐用。内部过电压保护 (OVP) 电路会持续监控 Vcc 引脚，每当其电平超过 36 V 时，即截止该集成电路。DIP14 和 SO-16 版本通过外部电阻网络提供可调 OVP 阈值。

  • High Power AC/DC Adapters for Notebooks, etc.
  • Offline Battery Chargers
  • Power Supplies for DVD, CD Players, TVs, Set-Top Boxes, etc.
  • Auxiliary Power Supplies (USB, Appliances, etc.)
  • Natural Drain Valley Switching for Lower EMI and Quasi-Resonant Operation (QR)
  • Smooth Frequency Foldback for Low Standby and Minimum Ripple at Light-Load
  • Adjustable Maximum Switching Frequency
  • Internal 200 ns Leading Edge Blanking on Current Sense
  • 250 mA Sink and Source Driver
  • Wide Operating Voltages: 8.0 to 36 V
  • Wide UVLO Levels: 7.2 to 15 V Typical
  • Auto-Recovery Internal Short-Circuit Protection (OCP)
  • Integrated 3.0 mA Typ. Start-Up Source
  • Current Mode Control
  • Adjustable Over-Voltage Level
  • Available in DIP8, DIP14 and SO-16 Package
  • Pb-Free Packages are Available

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