原标题：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

　　Two−Level Boost Follower Line Level Dependent (disabled by default)

　　Critical Conduction Mode (CrM)

　　Valley Synchronized Frequency Fold−back (VSFF): Low FrequencyOperation is Forced at Low Current Levels (9 pre−programmed settings).

　　Works With or Without a Transformer w/ZCD Winding (simple inductor)

　　On−time Modulation to Maintain a Proper Current Shaping in VSFF Mode

　　Skip Mode at Very Low Load Current (versions[ B**] and [D**])

　　Fast Line/Load Transient Compensation (Dynamic Response Enhancer)

　　Valley Turn−on

　　High Drive Capability: −500 mA/+800 mA

　　VCC Range: from 9.5 V to 30 V

　　Low Start−up Consumption for:

　　[**C] & [**D] Versions: Low VccStart−up level (10.5 V)

　　[**A] & [**B] Versions: High VccStart−up level (17.0 V)

　　Line Range Detection for Reduced Crossover Frequency Spread

　　This is a Pb−Free Device

　　NCP1602安全特性:

　　Thermal Shutdown

　　Non−latching, Over−Voltage Protection

　　Second Over−Voltage Protection

　　Brown−Out Detection

　　Soft−Start for Smooth Start−up Operation ([**C] &[**D] Versions)

　　Over Current Limitation

　　Disable Protection if the Feedback Pin is Not Connected

　　Low Duty−Cycle Operation if the Bypass Diode isShorted

　　Open Ground Pin Fault Monitoring

　　NCP1602典型应用:

　　PC Power Supplies

　　Lighting Ballasts (LED, Fluorescent)

　　Flat TV

　　All Off Line Appliances Requiring Power FactorCorrection

　　图1.NCP1602框图

　　图2.NCP1602应用电路图

　　160W评估板NCP1602GEVB

　　160‐W, Wide Mains, PFC Stage Driven by the NCP1602 Evaluation Board NCP1602GEVBExtremelyslim, the NCP1602 evaluation board is designed to be lessthan 13 mm high. This low-profile PFC Stage is intended todeliver 160 W under a 390-V output voltage from a widemains input. This is a PFC boost converter as used in flatTVs, high power LED street light power supplies, andall-in-one computer supplies. The evaluation board embedsthe NCP1602 AEA-version which is powered by an externalVCC. With the help of an external dc source, apply a VCCvoltage that exceeds the NCP1602−AEA start-up level(18.2 V max) to ensure the circuit starts operating. The VCC operating range is from 9.5 V up to 30 V.

　　图3.160W评估板NCP1602GEVB外形图(正面,高度<13mm)

　　图4.160W评估板NCP1602GEVB外形图(背面,高度<13mm)

　　160W评估板NCP1602GEVB电指标:

　　160W评估板NCP1602GEVB材料清单: