Product Overview NCP1631: Power Factor Controller, 2-Phase, Interleaved For complete documentation, see the data sheet Product Description The NCP1631 is a controller for use in 2-phase interleaved power factor correction pre-converters. Interleaving consists of paralleling two small stages in lieu of a single big stage. This approach has several merits like ease of implementation, ability to use smaller components, and better distribution of heating. These attributes make the interleaved PFC topology attractive to slim form factor applications such as flat panel TVs and ultra-slim notebook adapters. Interleaving can also extend the power range of Critical Conduction Mode, which is an efficient and cost-effective (no need for low trr diodes) operating mode. The NCP1631 operates in Frequency Clamped Critical Conduction mode (FcCrM). The circuit utilizes frequency foldback to linearly decay the clamping frequency as a function of power. As a result, the NCP1631 provides optimized efficiency across the load range. In addition, the NCP1631 drivers exhibit a 180 phase shift for a significantly reduced current ripple, which lowers EMI and reduces the rms current in the bulk capacitor. The NCP1631 incorporates all the features necessary for building robust and compact interleaved PFC stages, with a minimum of external components. Available in SOIC-16 package. Features Benefits • 180° out of phase operation • Frequency foldback at low power • Integrated overcurrent protection, overvoltage protection, UVLO, and brown-out protection • Frequency clamped critical conduction mode (FcCrM) operation Applications • Low EMI and reduces RMS current in the bulk capacitor • Improved light load efficiency • Increased robustness with few external components • Optimized efficiency over the load range End Products • Flat panel TVs • SMPS • Offline appliances requiring power factor correction • LCD TV • Computer power supplies • Servers Part Electrical Specifications Product Compliance Status PFC Mode Freque Control Topolo ncy Mode gy Operati on fSW Typ VCC (kHz) Max (V) Drive Cap. (mA) UVLO (V) Latch UVP Inhibiti on Packag e Type NCP1631DR2G Pb-free Active CRM Variabl e Up to 500 500 / 500 9.5 12 Yes Yes YES SOIC16 Halide free Voltag Stepe Mode Up 20 Application Diagram For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016