Power factor correction ICs offer enhanced system protection and safety

Utilising IR's One Cycle Control technology, the devices are designed to offer high power factor, low total harmonic distortion and dc Bus regulation while enabling a reduction in component count, pcb area and design time. In addition, they are designed to operate in continuous conduction mode Boost pfc converters with average current mode control over 85 to 264Vac input line voltage range. "By integrating more features than traditional pfc solutions and eliminating the need for external implementation, the IR115x range significantly reduces the overall cost and complexity of a feature rich pfc control design compared to traditional solutions while offering enhanced protection and safety," said Helen Ding, senior applications engineer, IR's Energy Saving Products business unit. According to Ding, the devices 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. A user initiated micropower startup/sleep mode is implemented to enable 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 IR1155S offers programmable switching frequency between 48 to 200kHz based on the specific application requirement and the IR1152S and IR1153S offer a fixed switching frequency between 66 and 22.2kHz respectively.