IR2521DSTRPBF Integrated Circuits (ICs)

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IR2521DSTRPBF is a lighting, ballast controller power management integrated circuit (PMIC). It includes an efficient, fixed-frequency, current mode, single-stage power factor correction (PFC) controller, along with an interleaved output stage up to 5kHz. The controller features a differential current sensing technique that enables high power factor operation without the need for an opto-coupler. The part provides a high-performance solution for lighting or ballast application requiring high power conversion efficiency and low EMI.

Applications

IR2521DSTRPBF is suitable for many lighting or ballast applications, including street lights, LED and traditional lamps, LED light engines, spotlights, indoor and outdoor lighting, panel lighting, and automotive lighting systems.

Working Principle

The IR2521DSTRPBF is designed to implement a two-stage power supply. In the first stage, the system is designed to operate at a fixed frequency, current mode, single-stage, power factor corrections (PFC). It uses a differential current sensing technique to ensure high power factor operation without the need for an opto-coupler. The controller also includes a RCE overcurrent detection protection and a dead zone synchronization for high efficiency, low THD power factor correction.

In the second stage, the controller features an interleaved output stage up to 5kHz, suitable for small- and large-sized dimmers. This setup allows for an efficiently increasing output voltage and current slew rate. The controller also includes a pre-biased start-up circuit and an enable/disable input for improved reliability.

Overall, IR2521DSTRPBF provides an ideal solution for a precision low-cost, intelligent, single-stage PFC/two stage lighting or ballast system with high-performance efficiency, low EMI noise and high power factor performance.

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