Digital controller simplifies two-port USB-PD adapters
STMicroelectronics is extending its highly integrated ST-ONE family of USB Power Delivery (USB-PD) digital controllers with a dual output device
The ST-ONEMP combines an ARM Cortex-M0+ microcontroller, energy-efficient non-complementary active clamp flyback controller and USB-PD 3.1 interface in a single package. Galvanic isolation between primary-side and secondary-side circuitry simplifies the design and assembly of USB-PD power adapters.
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Adding support for power sharing further simplifies the use of a second output in addition to the USB-PD output to enhance flexibility and convenience for end users.
Inside the ST-ONEMP, the Cortex-M0+ MCU is embedded on the secondary side and has 64KB of Flash for customizing the USB-PD protocol and power conversion firmware. USB-PD 3.1 PPS certified firmware is pre-loaded, permitting a turnkey solution for standard applications. The MCU controls the synchronous rectifier and the flyback converter and is optimized for zero-voltage switching non-complementary active-clamp topology, which allows high power with greater efficiency than conventional quasi-resonant flyback.
The ST-ONEMP pairs with ST’s MasterGaN power technology, which contain ST’s gallium nitride (GaN) wide-bandgap power transistors with integrated gate drivers. ST’s GaN technology permits superior switching at higher frequencies than conventional silicon MOSFETs, enabling adapters to deliver greater power density with high energy efficiency.
ST has produced the EVLONEMP reference design using the controller and GaN4 transistors to create a 65W + 10W AC/DC adapter at comparable weight and volume to a 20W single-port smartphone charger.
Peak efficiency, at 94%, is 2% higher than comparable conventional 2-port adapters, while the PCB area is a quarter of the size. This allows OEMs to deliver more environmentally friendly products that save energy and cut the use of plastics by enabling smaller enclosure sizes.
The ST-ONEMP is available now in a SSOP36 package, priced from $3.89 for orders of 1000 pieces.
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