Offline Controllers | NCP1280

有源箝位电压模式 PWM 控制器，用于离线应用

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NCP1280 为需要高能效和较少零件的离线电源提供高度集成的方案。此电压模式控制器提供的控制输出用于驱动有源箝位电路的正向转换器主 MOSFET 和辅助 MOSFET。带有可编程延迟的第二个输出还可用于在辅助电路上驱动同步整流器，或用于不对称半桥电路。高电压启动电路（能力为 700 V）可降低零件数目和系统功耗。线路欠电压/过电压保护、软启动、单电阻可编程（高）频率振荡器、线路电压前馈、双模式过电流保护和最大占空比控制等其他特性还可以最低成本实现转换器优化。与传统正向转换器相比，基于 NCP1280 的转换器可提供明显的能效提高和系统成本节省。

  • Off−Line Power Converters in 100−500 W Range
  • Desktop Power Supplies (High−End)
  • Industrial Power Supplies
  • Plasma/LCD TV Front−End

  • Internal High Voltage Start−Up Regulator (25 V to 700 V)
  • Dual Control Outputs with Adjustable Overlap Delay
  • Programmable Maximum Duty Cycle Control
  • Single Resistor Oscillator Frequency Setting
  • Fast Line Feedforward
  • Line Under/Overvoltage Lockout
  • Dual Mode Overcurrent Protection
  • Programmable Soft Start
  • Precision 5.0 V Reference
  • Pb-Free Package is Available*

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