‘Smallest’ PFC boost ic unveiled by IR

The device is designed for switch mode power supply, led drivers, fluorescent and HID electronic ballast applications. It incorporates a free running frequency oscillator with on and off time control of the boost power mosfet. The on time feature is used to maintain an accurate and constant dc bus output voltage while providing a sinusoidal shaped ac mains input current for high power factor and ultra low total harmonic distortion. Protection features include dc bus over voltage protection, programmable mosfet over current protection and integrated ESD protection on all pins. Micro power start up current, 20.8V internal Zener clamp on VCC and latch immunity on all inputs and outputs are also featured.