Reference design; USB Type-C PD charger delivers 18W
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.
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