时间:2013-11-12 11:02:55 作者:ONSEMI 来源:中电网
ONSEMI公司的NCP1615是一款采用创新型电流控制频率反馈方法的高压功率因数校正控制器。采用这样方法的电路,在临界条件下电感电流可以超过设置值。当电流在预设水平以下时,NCP1615芯片的控制频率会线性衰减到26KHz。本文首先介绍芯片的简介、特性及应用领域,并给出设计方案连接方法、设计原理图、元器件列表及PCB元件布局图。
The NCP1615 is a high voltage PFC controller designed to drive PFC boost stages based on an innovative Current Controlled Frequency Foldback (CCFF) method. In this mode, the circuit operates in critical conduction mode (CrM) when the inductor current exceeds a programmable value. When the current is below this preset level, the NCP1615 linearly decays the frequency down to a minimum of about 26 kHz at the sinusoidal zero−crossing. CCFF maximizes the efficiency at both nominal and light load. In particular, the standby losses are reduced to a minimum. Innovative circuitry allows near−unity power factor even when the switching frequency is reduced.
The integrated high voltage start−up circuit eliminates the need for external start−up components and consumes negligible power during normal operation. Housed in a SOIC−14 or SOIC−16 package, the NCP1615 incorporates the features necessary for robust and compact PFC stages, with few external components.
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