PFC boost IC

21 August 2013 Power Electronics / Power Management

International Rectifier announced the introduction of the IRS2505LTRPBF, a power factor correction (PFC) boost IC in a 5-pin SOT23 package for switch mode power supply (SMPS), LED driver, fluorescent and HID electronic ballast applications.

The device features a novel control system that can implement a PFC controller with only five pins, reducing overall system size, cost and component count. The IRS2505L may be configured to operate in critical conduction boost PFC, buck or flyback configuration.

The IC 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. The off-time is determined by the inductor current zero-crossing detection circuit that does not require a secondary winding, further cutting component count.

The IRS2505L offers wide input voltage and load range, regulated DC bus output voltage and programmable DC bus voltage level. Protection features include DC bus over-voltage protection, programmable MOSFET over-current protection and integrated ESD protection on all pins. Micro-power startup current, 20,8 V internal Zener clamp on VCC and latch immunity on all inputs and outputs are also featured.

For more information contact Erich Nast, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za

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