NCP1611 Datasheet | onsemi

Enhanced, High-Efficiency Power Factor Controller The NCP1611 is designed to drive PFC boost stages based on an innovative Current Controlled Frequency Fold- back (CCFF) method. In this mode, the circuit classically operates in Critical conduction Mode (Cr M) when the inductor current exceeds a .onsemi. programmable value. When the current is below this preset level, the NCP1611 linearly decays the frequency down to about 20 k Hz when MARKING the current is null. CCFF maximizes the efficiency at both nominal DIAGRAM and light load. In particular, the stand- by losses are reduced to a minimum. Like in FCCr M controllers, internal circuitry allows near- unity power factor even when the switching frequency is reduced. Housed in a SO- 8 package, the circuit also incorporates the Features necessary for robust and pact PFC stages, with few external ponents. Features - Near- Unity Power Factor - Critical Conduction Mode (Cr M) - Current Controlled Frequency Fold- back (CCFF): Low Frequency 8 1 SOIC- 8 CASE 751 SUFFIX D NCP1611x ALYW G NCP1611x = Specific Device Code x = A or B A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb- Free Package Operation is Forced at Low Current Levels - On- time Modulation to Maintain a Proper Current Shaping in CCFF Mode PIN CONNECTIONS Vcontrol Feedback - Skip Mode Near the Line Zero Crossing Vsense - Fast Line / Load Transient pensation (Dynamic Response FFcontrol Enhancer) CS/ZCD - Valley Turn on (Top...