This joint reference design describes an 18W, USB PD compliant, AC-DC power converter. The design, titled DER-567, pairs the WT6630P USB Type-C PD controller from Weltrend with Power Integrations’ InnoSwitch-CP off-line CV/CC flyback switcher IC, to produce a compact and highly energy-efficient standards-compliant power adapter, that PI says will deliver faster charge times for the larger batteries required to power next-generation mobile devices.
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 component count by combining Type-C cable detection circuits, USB PD physical layer (PHY), and components related to system-level protections such as over-voltage protection (OVP), over-current protection (OCP), and over-temperature protection (OTP).
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 FluxLink technology, eliminating the need for an optocoupler and enabling secondary-side control that delivers fast transient performance, good CV/CC regulation and very low no-load power consumption. FluxLink technology also enables safe synchronous rectification, resulting in an extremely efficient power supply.
Commented Dujari: “With Type-C cable and USB PD protocol support, an 18 W adapter is the logical next level for rapid charging and we are pleased to work with Weltrend on this joint reference design. The WT6630P controller delivers a highly cost-effective implementation of the USB 2.0 specification, helping leading suppliers in bringing a USB PD compliant adapter to the market. The design is already in mass production by a leading smartphone OEM.”
Reference Design, DER-567, implements USB PD standard 2.0 and is capable of 5V/3A and 9V/2A 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 https://www.power.com/der-567