18 W USB PD rapid-charger reference design targets smart mobile devices

Power Integrations and Weltrend Semiconductor announce a joint reference design describing an 18 W, USB PD compliant, AC/DC power converter targeted at chargers for smart mobile devices. The design, titled DER-567, pairs the Weltrend WT6630P USB Type-C PD controller with the Power Integrations InnoSwitch-CP off-line CV/CC flyback switcher IC, enabling designers to produce a compact and energy-efficient standards-compliant power adapter.

Weltrend’s WT6630P USB PD controller is certified by USB Implementers Forum (USB-IF)  for USB Type-C and is compatible with the USB PD 2.0 baseband communication protocol. The Weltrend device reduces the BOM by combining Type-C cable detection circuits, USB PD physical layer, and components related to system-level protections such as over-voltage protection, over-current protection, and over-temperature protection.

By providing a constant power output, Power Integrations’ InnoSwitch-CP switcher IC allows battery-operated devices to draw maximum power from the charger at any selected output voltage, optimizing charge time and cost. InnoSwitch-CP ICs use the company’s innovative FluxLink technology, eliminating the need for an optocoupler and enabling secondary-side control that delivers fast transient performance, exceptional CV/CC regulation and very low no-load power consumption. FluxLink technology also enables easy implementation of safe synchronous rectification, resulting in an extremely efficient power supply.

Reference Design, DER-567, implements USB PD standard 2.0 and is capable of 5 V/3 A and 9 V/2 A of power delivery over a standard non-E-marked USB Type-C cable. More information on the Weltrend controller is available at www.weltrend.com/en-global/product/detail/67/112/395. The design may be downloaded at http://www.power.com/der-567.