PMICs boost efficiency for handheld industrial equipment

An active clamp flyback chipset and a 6.0A three-level buck battery charger from Texas Instruments have been released by Texas Instruments.

First, the UCC28780 active clamp flyback controller operates at up to 1.0MHz and the UCC24612 synchronous rectifier controller is claimed to halve the size of power supplies in AC/DC adapters and USB Power Delivery chargers. For battery-powered electronics that need charging efficiency in a small size, the bq25910 is a 6.0A three-level buck battery charger. It enables up to 60 per cent smaller footprint in smartphones, tablets and electronic point-of-sale devices.

Designed to work with both gallium nitride (GaN) and silicon (Si) FETs, the UCC28780 has features to enable the active clamp flyback topology to meet modern efficiency standards. Multi-mode control that changes the operation based on input and output conditions, and pairing the UCC28780 with the UCC24612 can achieve and maintain high efficiency at full and light loads, says Texas Instruments.

Multi-mode control enables efficiency up to 95 per cent at full loads and standby power of less than 40mW, exceeding Code of Conduct (CoC) Tier 2 and U.S. Department of Energy (DoE) Level VI efficiency standards. For designs above 75W, engineers can also pair the chipset with a new six-pin power factor correction (PFC) controller, the UCC28056, which is optimised for light-load efficiency and low standby power consumption to achieve compliance with mandatory International Electrotechnical Commission (IEC)-61000-3-2 AC current harmonic limit regulations.

Features such as adaptive zero voltage switching (ZVS) control, enable engineers to design their systems with a combination of resistor settings and controller auto-tuning.

The bq25910 three-level buck battery charger uses three level power conversion technology for higher charging efficiency, up to 50 per cent faster, compared with conventional architectures by reducing thermal loss, says Texas Instruments. 

The integrated MOFSETs and lossless current sensing reduce PCB space and allows designers to use small 0.33-microH inductors, saving even more space.

The bq25910 enables 95 per cent charging efficiency, which could take a standard smartphone battery from empty to 70 per cent 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.

All devices are available now, with supporting evaluation modules. The UCC28780 is available in SOIC and QFN, the UCC24612 and UCC28056 are provided in an SOT-23, and the bq25910 are offered in a wafer chip scale package (WCSP).

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