NCP1622 Datasheet | onsemi

DATA SHEET .onsemi. Enhanced, High-Efficiency Power Factor Controller TSOP- 6 SN SUFFIX CASE 318G The 6- pin PFC controller NCP1622 is designed to drive PFC boost stages. It is based on an innovative Valley Synchronized Frequency Fold- back (VSFF) method. In this mode, the circuit classically operates in Critical conduction Mode (Cr M) when Vcontrol voltage exceeds a programmable value Vctrl,FF. When Vcontrol is below this preset level Vctrl,FF, the NCP1622 (versions [B- - ] and [D- - ]) linearly decays the frequency down to about 30 k Hz until Vcontrol reaches the SKIP mode threshold. VSFF maximizes the efficiency at both nominal 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 TSOP6 package, the circuit also incorporates the Features necessary for robust and pact PFC stages, with few external ponents. MARKING DIAGRAM XXXAYWG G XXX A Y W G = Specific Device Code = Assembly Location = Year = Work Week = Pb- Free Package (Note: Microdot may be in either location) PIN CONNECTIONS General Features - Near- Unity Power Factor - Critical Conduction Mode (Cr M) - 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 (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 pensation (Dynamic Response Enhancer) - Valley Turn- on - High Drive...