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Power Electronics Europe News
PMICs boost efficiency for personal electronics and handheld industrial equipment

The power management chips, unveiled at the Applied Power Electronics Conference (APEC)  in San Antonio, Texas, USA (4 to 8 March 2018), enable designers to boost efficiency and shrink power supply and charger sizes for personal electronics and handheld industrial equipment.


Operating at up to 1.0MHz, the chipset combines the UCC28780 active clamp flyback controller and the UCC24612 synchronous rectifier controller to reduce the size of power supplies in AC/DC adapters and USB Power Delivery chargers by half. For battery-powered electronics that need maximum charging efficiency in a small size, the bq25910 6.0A three-level buck battery charger enables up to a 60% smaller footprint in smartphones, tablets and electronic point-of-sale devices, says the company.


The active clamp flyback chipset is designed to work with both gallium nitride (GaN) and silicon (Si) FETs. The UCC28780 has adaptive features to enable the active clamp flyback topology. Multimode control changes the operation based on input and output conditions and enables efficiency up to 95% at full loads and standby power of less than 40mW, exceeding Code of Conduct (CoC) Tier 2 and US DoE Level VI efficiency standards. For designs above 75W, the chipset can be paired with the ICC28056 six-pin power factor correction (PFC) controller, optimised for light-load efficiency and low standby power consumption to achieve compliance with mandatory IEC-61000-3-2 AC current harmonic limit regulations.


The bq25910 three-level buck battery charger enables up to 50% higher charging efficiency, compared with conventional architectures, through reduced thermal loss.


It has integrated MOFSETs and lossless current sensing to reduce PCB space and allows designers to use small 0.33µH inductors, saving even more space. It also enables 95% charging efficiency, which could take a standard smartphone battery from empty to 70% charged in less than 30 minutes.


A differential battery-voltage sense line enables fast charging by bypassing parasitic resistance in the PCB for more accurate voltage measurements, even if the battery is placed away from the charger in the system.


The UCC28780 is available in an SOIC and QFN, the UCC24612 is offered in an SOT-23 and the bq25910 is provided in a wafer chip scale package (WCSP). Evaluation modules are also available.




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