en.Wedoany.com Reported - STMicroelectronics has introduced the L6462A controller, designed to reduce bill of materials costs and improve efficiency in power supplies rated up to 250W. Targeting applications such as battery chargers, power adapters, flat-panel TV power supplies, and LED lighting drivers, the device aims to help designers meet stricter energy efficiency and eco-design requirements.
The L6462A features a multiplier-free architecture, replacing the traditional analog multiplier and external voltage detection network with an integrated current generator and shaping circuit to generate a sinusoidal current reference. This design eliminates external voltage divider components, simplifies circuit implementation, and reduces the total component count.
The controller also introduces an alternative method for detecting inductor demagnetization. The L6462A obtains relevant information directly from the gate driver output, eliminating the need for auxiliary windings and dedicated detection circuits. This enables a more compact design, fewer external components, and lower implementation costs while maintaining the expected performance of a transition-mode PFC topology.
In terms of electrical performance, STMicroelectronics states that its current shaping architecture and demagnetization detection technology help reduce total harmonic distortion and improve conversion efficiency, especially under medium and light load conditions. The controller's standby current is below 60 microamps, supporting compliance with stringent standby power regulations. Under full load, the L6462A operates in valley-switching quasi-resonant mode to minimize switching losses. As output power decreases, the controller gradually reduces the operating frequency through valley-jumping technology, maintaining high efficiency across a wide load range. For LED lighting applications, the integrated deep burst mode ensures smooth dimming performance at low output levels.
The L6462A supports a universal AC input voltage range of 90V to 264V, with a typical configuration generating a 400V output bus. Additional features include a high-precision voltage reference, enhanced transient response, direct MOSFET gate drive capability with active pull-down protection, remote enable/disable control, and protection functions such as overcurrent, overvoltage, feedback fault, and inductor saturation.
To accelerate development, STMicroelectronics also offers the EVL6462A-250W-M evaluation board, showcasing a compact 250W PFC pre-regulator design that achieves peak efficiency exceeding 97% and low total harmonic distortion across a wide operating range. The L6462A is now available in a compact SOT23-6L package.
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