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| NCP1654 300W PFC控制方案 |
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| 文章來源： 更新時間：2015/3/27 9:28:00 |
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On Semi公司的NCP1654是用于連續導通模式(CCM)功率因素修正(PFC)預轉換器,和IEC61000−3−2兼容,具有快速瞬態響應特性,非常少的外接元件和很低的起動電流(小于75uA),主要用在平板電視,臺式PC,白色家電,開關電源和AC適配器.本文介紹了NCP1654主要特性, 功能框圖, 300W 65kHz PFC電路以及評估板NCP1654GEVB主要特性,電路圖和材料清單.
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
• Accurate Fully Integrated 65/133/200 kHz Oscillator
• Latching PWM for cycle−by−cycle Duty−Cycle Control
• Internally Trimmed Internal Reference
• Undervoltage Lockout with Hysteresis
• Soft−Start for Smoothly Startup Operation
• Shutdown Function
• Pin to Pin Compatible with Industry Standard
• This is a Pb−Free Device
Safety Features
• Inrush Currents Detection
• Overvoltage Protection
• Undervoltage Detection for Open Loop Detection or Shutdown
• Brown−Out Detection
• Soft−Start
• Accurate Overcurrent Limitation
• Overpower Limitation
NCP1654應用:
• Flat TVs, PC Desktops
• AC Adapters
• White Goods, other Off−line SMPS
圖1.NCP1654功能框圖
圖2.NCP1654 300W 65kHz PFC電路
評估板NCP1654GEVB
The NCP1654GEVB is a Power Factor Controller to efficiently drive Continuous Conduction Mode (CCM) step-up pre-converters. The NCP1654 allows operation in Follower Boost mode to drastically lower the pre-converter size and cost, in a straight-forward manner. The NCP1654 is a continuous conduction mode and fixed frequency controller (65kHz). The coil (650 uH) is selected to limit the peak to peak current ripple in the range of 36 % at the sinusoid top, in full load and low line conditions.
評估板NCP1654GEVB主要特性
Fast Transient Response
Low Operating Consumption
Inrush Currents Detection
Overvoltage Protection
Brown-Out Detection
圖3.評估板NCP1654GEVB外形圖
圖4.評估板NCP1654GEVB電路圖
評估板NCP1654GEVB材料清單:
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