Mobile Devices

New Reference Design for Smart Mobile Device Chargers Announced

26 April 2017

Power Integrations, a Silicon Valley supplier of electronic components used in high-voltage power-conversion systems, in association with Weltrend Semiconductor, a integrated circuit designer based in Taiwan, recently announced a joint reference design describing an 18 watt, USB Power Delivery (PD) compliant, AC-DC power converter targeted at smart mobile device chargers. The design, DER-567, enables designers to produce a compact, standards-compliant power adapter that is highly energy-efficient.

“Users can expect faster charge times for the larger batteries required to power next-generation mobile devices,” said Power Integrations director of marketing Shyam Dujari. Dujari noted that USB PD adds intelligence to adapters, allowing more power to be delivered flexibly and safely. According to Tony Lin, acting VP of marketing at Weltrend, “USB PD adoption started first in notebook PCs, and is now rapidly becoming the preferred choice of smartphone OEMs for safe and rapid charging.”

Charge time and cost are optimized by Power Integrations’ InnoSwitch-CP off-line CV/CC flyback switcher integrated circuit, which is built into the design. The IC provides a constant power output that allows battery-operated devices to draw maximum charger power at any selected output voltage. The company’s FluxLink technology, which is built into the IC, eliminates the need for an octocoupler and enables secondary-side control to deliver fast transient performance, constant voltage/constant circuit regulation and low no-load power consumption. FluxLink also enables easy implementation of safe synchronous rectification, resulting in a highly efficient power supply.

According to Lin, InnoSwitch AC-DC converter circuits offer the “high efficiency, reliability and compact footprint required by developers of rapid charging adapters for the smart mobile industry.”

The design also incorporates Weltrend’s WT6630P USB Type-CD PD controller, which delivers a highly cost-effective implementation of the USB 2.0 specification, according to Dujari. The controller incorporates system-level protection components such as over-voltage protection (OVP), over-current protection (OCP) and over-temperature protection (OTP).

Dujari believes that an 18 watt adapter is “the logical next level for rapid charging.”

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