[原创] On Semi NCP1654 300W PFC控制方案

On Semi公司的NCP1654是用于连续导通模式(CCM)功率因素修正(PFC)预转换器,和IEC61000−3−2兼容,具有快速瞬态响应特性,非常少的外接元件和很低的起动电流(小于75uA),主要用在平板电视,台式PC,白色家电,开关电源和AC适配器.本文介绍了NCP1654主要特性, 功能框图, 300W 65kHz PFC电路以及评估板NCP1654GEVB主要特性,电路图和材料清单.

The NCP1654 is a controller for Continuous Conduction Mode(CCM) Power Factor Correction step−up pre−converters. It controlsthe power switch conduction time (PWM) in a fixed frequency modeand in dependence on the instantaneous coil current.

Housed in a SO8 package, the circuit minimizes the number ofexternal components and drastically simplifies the PFCimplementation. It also integrates high safety protection features thatmake the NCP1654 a driver for robust and compact PFC stages likean effective input power runaway clamping circuitry.

NCP1654主要特性:

• IEC61000−3−2 Compliant
• Average Current Continuous Conduction Mode
• Fast Transient Response
• Very Few External Components
• Very Low Startup Currents (<75 _A)
• Very Low Shutdown Currents (< 400 _A)
• Low Operating Consumption
• ±1.5 A Totem Pole Gate Drive..

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