STMicroelectronics ST-ONE series USD PD controller power increased to 140W
STMicroelectronics has launched ST-ONEHP, the industry's first integrated digital controller chip certified by USB-IF's USB Power Delivery Extended Power Range (USB PD 3.1 EPR) specification.
As the third controller in the ST-ONE series, the ST-ONEHP has an output voltage of 28V, which simplifies the development and design of chargers and power adapters with a maximum power rating of 140W. The converter features ST-ONE architecture, a non-complementary active clamp flyback zero-voltage switching (ZVS) topology, which ensures excellent energy efficiency for applications with high power output and high switching frequency. The chip integrates basic functions such as a secondary rectifier and a USB PD communication interface, saving bill of material costs as well as PCB size and layout complexity. Built-in synchronous rectifiers help maximize energy efficiency, and reinforced galvanic isolation allows designers to develop a compact and safe solution.
Inside ST-ONEHP, an Arm® Cortex®-M0+ microcontroller is responsible for the overall control. The microcontroller comes preloaded with certified USB PD firmware, which simplifies the approval process for final products to qualify for the USB Logo. The microcontroller has 64KByte flash memory that can store custom power conversion firmware.
The ST-ONEHP is ideally suited for use with STMicroelectronics' MasterGaN chips integrating the company's third-generation gallium nitride (GaN) power transistors and optimized gate drivers in a single package. Compared with traditional silicon transistors, this SiP solution reduces the difficulty of sampling GaN technology in energy-saving applications, with advantages such as superior thermal performance and switching energy efficiency.
Complementary to ST-ONE converters, MasterGaN helps maximize performance and switching frequency, enabling the use of smaller passive components. By integrating the ST-ONEHP controller and a 9mm x 9mm MasterGaN1 half-bridge power stage, STMicroelectronics has produced an EVLONE140W charger reference design that is smaller than a standard 65W laptop charger.
The volume of the charger reference design is 90cm3, which is equivalent to the industry's advanced 25W/in3 power density, and the peak energy efficiency exceeds 94%. From an environmental point of view, this charger uses only a quarter of the plastic of ordinary chargers and is 2% more energy efficient than ordinary chargers. If these products were used in all chargers produced globally, CO2 emissions would be reduced by 3.5 million tons.
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