Onsemi NCP1622 | Demoboard 160-W PFC Stage NCP1622 Evaluation Board

Beschreibung

Housed in a TSOP6 package, the NCP1622 is designed to drive PFC boost stages in so-called Valley Synchronized Frequency Fold-back (VSFF). In this mode, the circuit classically operates in Critical conduction Mode (CrM) when VCTRL pin voltage exceeds a product version programmable voltage level. When VCTRL pin voltage is below this programmable level, the NCP1622 linearly decays the frequency down to about 20 kHz, when the load current is nearly zero. VSFF maximizes the efficiency throughout the load range. Incorporating protection features for rugged operation, it is furthermore ideal in systems where cost-effectiveness, reliability, low stand-by power and high-efficiency are the key requirements. Extremely slim, the NCP1622 evaluation board is designed to be less than 13 mm high. This low-profile PFC Stage is intended to deliver 160 W under a 390-V output voltage from a wide mains input. This is a PFC boost converter as used in flat TVs, high power LED street light power supplies, and all-in-one computer supplies. The evaluation board embeds the NCP1622 AEA-version which is powered by an external VCC. With the help of an external dc source, apply a VCC voltage that exceeds the NCP1622-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.

Eigenschaften

• Near−Unity Power Factor
• Critical Conduction Mode (CrM)
• Valley Synchronized Frequency Fold−back (VSFF): Low Frequency Operation is Forced at Low Current Levels (9 Pre−programmed Settings)
• Works With or Without a Transformer w/ ZCD Winding (SimpleInductor)
• 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] Version: Low Vcc Start−up level (10.5 V)[A] Version: High Vcc Start−up level (17.0 V)
• Line Range Detection for Reduced Crossover Frequency Spread
• This is a Pb−Free Device

Typische Anwendungen

• Offline Power Supply

Weiterführende Informationen

• Datenblatt