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


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


PI InnoSwitch_Weltrend_refdesign_apr2017


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
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.