International Rectifier, has introduced the IR115x family of μPFC™ power factor correction (PFC) ICs for a wide variety of AC-DC applications including lighting, LCD/PDP TV and game consoles, fans, air conditioners, uninterruptible power supplies (UPS) and Switch Mode Power Supplies (SMPS), ranging from 300W to 8kW. The IR115x ICs, utilizing IR's One Cycle Control (OCC) technology, offer high power factor (PF), low total harmonic distortion (THD) and excellent DC Bus regulation while enabling drastic reduction in component count, PCB area and design time compared to traditional solutions. The ICs are designed to operate in continuous conduction mode Boost PFC converters with average current mode control over 85-264VAC input line voltage range. By integrating more features than traditional PFC solutions and eliminating the need for external implementation, the IR115x significantly reduces the overall cost and complexity of a feature-rich PFC control design compared to traditional PFC solutions while offering enhanced protection and safety. The new μPFC™ ICs offer advanced system-enabling and protective features including dedicated pin for over-voltage protection, cycle by cycle peak current limitation, open loop protection, VCC UVLO and programmable soft-start. The user initiated micropower startup/sleep-mode enables compliance with standby power requirements mandated by regulations such as Energy Star, Green Power and Blue Angel. The IR1152S and IR1153S also feature brown-out protection. The IR1152, for example, is a fixed 66kHz frequency PFC IC designed to operate in continuous conduction mode Boost converters with average current mode control. The IC is packed with an impressive array of advanced features such as programmable soft-start, micro-power startup current, user initiated micro-power Sleep mode for compliance with stand-by energy standards, ultra low bias currents for sensing pins. The fixed internal oscillator ensures stable operation at 66kHz switching frequency with very low gate jitter thus eliminating audible noise in PFC magnetics. In addition, the IC offers input-line sensed brown-out protection (BOP), "dual & dedicated" overvoltage protection, cycle-by-cycle peak current limit, open loop protection (OLP) and VCC under voltage lock-out (UVLO). All these features are offered in a compact 8-pin package making IR1152 the most feature-intensive IC for PFC applications. There is an application note that provides an overview of IR1152 and demonstrates the design of a universal input 350W AC-DC Boost PFC Converter on the company's website. Design & layout tips are also included. The IR1152 also features a comprehensive array of protection features to safeguard the system. The IR1155S offers programmable switching frequency between 48 kHz to 200 kHz based on the specific application requirement, while the IR1153S offer fixed switching frequency of 22.2kHz. All these devices are compatible with IR's Ultrafast and Warp IGBTs for systems with power ratings higher than 750 Watt and switching frequency up to 100kHz. The devices are lead free and RoHS compliant. Datasheets, an application note and online design tool are available on the International Rectifier website. The IRAC1152-350W and IRAC1155-300W reference designs are also available. www.irf.com
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