On Semi NCP1602 160W PFC电源解决方案
On Semi公司的NCP1602是6引脚PFC控制器,采用临界导电模式(CrM),具有接近100%的电源效率,具有热关断,二次过压保护,软起动等保护特性,主要用在PC电源,照明镇流器,平板TV和需要PFC的所有离线电源.本文介绍了NCP1602通用特性和安全特性,框图和应用电路图,以及160W评估板NCP1602GEVB主要特性和指标,电路图和材料清单.
The 6−pin PFC controller NCP1602 is designed to drive PFC booststages. It is based on an innovative Valley Synchronized FrequencyFold−back (VSFF) method. In this mode, the circuit classicallyoperates in Critical conduction Mode (CrM) when Vcontrolvoltageexceeds a programmable value Vctrl,FF. When Vcontrolis below thispreset level Vctrl,FF, the NCP1602 (versions [B**] and [D**]) linearlydecays the frequency down to about 30 kHz until Vcontrolreaches theSKIP mode threshold. VSFF maximizes the efficiency at bothnominal and light load. In particular, the stand−by losses are reducedto a minimum. Like in FCCrMcontrollers, internal circuitry allowsnear−unity power factor even when the switching frequency isreduced. Housed in a TSOP6 package, the circuit also incorporates thefeatures necessary for robust and compact PFC stages, with fewexternal components.
NCP1602通用特性:
Near−Unity Power Factor..
