OnSemiNCP1654電源功率因素控制方案
OnSemi 公司的NCP1654是電源功率因素控制器,與IEC61000−3−2兼容,平均電流連續(xù)導(dǎo)通模式(CCM),具有快速瞬態(tài)響應(yīng)特性和非常少的外接元件,起動電流低于75uA,關(guān)斷電流小于400uA,主要應(yīng)用于平板電視,臺式計(jì)算機(jī),AC適配器,白色家電和其它離線開關(guān)電源(SMPS).本文介紹了NCP1654的主要特性,功能方框圖, 軟起動方框圖,300W 65kHz功率因素修正電路以及NCP1654EVB評估板主要特性,電路圖和所用材料清單.
NCP1654PowerFactor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
The NCP1654 is a controller for Continuous Conduction Mode (CCM) Power Factor Correction step−up pre−converters. It controls the power switch conduction time (PWM) in a fixed frequency mode and in dependence on the instantaneous coil current.
Housed in a SO8 package, the circuit minimizes the number of external components and drastically simplifies the PFC implementation. It also integrates high safety protection features that make the NCP1654 a driver for robust and compact PFC stages like an 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 uA)
Very Low Shutdown Currents (< 400uA)
Low Operating Consumption
1.5 A Totem Pole Gate Drive
Accurate Fully Integrated 65/133/200kHz Oscillator
Latching PWM for cycle−by−cycle Duty−Cycle Control
Internally Trimmed Internal Reference
Undervoltage Lockoutwith Hysteresis
Soft−Start for Smoothly Startup Operation
Shutdown Function
Pin to Pin Compatible with Industry Standard
This is a Pb−Free Device
NCP1654安全特性:
Inrush Currents Detection
Overvoltage Protection
Undervoltage Detection for Open Loop Detection or Shutdown
Brown−Out Detection
Soft−Start
Accurate Overcurrent Limitation
Overpower Limitation
NCP1654典型應(yīng)用:
Flat TVs, PC Desktops
