Industry's smallest PFC boost IC is in a 5pin SOT-23

23 July 2013

Industry's smallest PFC boost IC is in a 5pin SOT-23
Industry's smallest PFC boost IC is in a 5pin SOT-23

International Rectifier claims it is the industry's smallest power factor correction (PFC) boost IC in a 5pin SOT23 package

The IRS2505LTRPBF can be used for switch mode power supplies, LED drivers, fluorescent and HID electronic ballast applications.

The IC extends the company's µPFC PFC control IC family and features a novel control system that can implement a PFC controller with only five pins, significantly reducing overall system size, component count and system cost.

It may be configured to operate in critical conduction boost PFC, buck or flyback configuration.  A free-running frequency oscillator with on- and off-time controls 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.

Input voltage ranges from 7.7 to 20.8V with standby current of less than 50µA. It also offers 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

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