OnSemiNCP1654电源功率因素控制方案
OnSemi 公司的NCP1654是电源功率因素控制器,与IEC61000−3−2兼容,平均电流连续导通模式(CCM),具有快速瞬态响应特性和非常少的外接元件,起动电流低于75uA,关断电流小于400uA,主要应用于平板电视,台式计算机,AC适配器,白色家电和其它离线开关电源(SMPS).本文介绍了NCP1654的主要特性,功能方框图, 软起动方框图,300W 65kHz功率因素修正电路以及NCP1654EVB评估板主要特性,电路图和所用材料清单.
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典型应用:
Flat TVs, PC Desktops
