ST-ONEHP is the third controller in the ST-ONE series. The converter adopts ACF architecture to ensure excellent energy efficiency at high power output and high frequency. The chip spans the primary & secondary, and the secondary side integrates synchronous rectification and USB PD functions to save material cost and PCB area.

The built-in Arm® Cortex®-M0+ MCU of ST-ONEHP is responsible for overall control. The MCU is pre-installed with certified USB PD software, further simplifying the application process for the final product to obtain USB logo qualification. The MCU is equipped with 64KB Flash to store customized power conversion code.

ST-ONEHP is very suitable for use with MasterGaN. The MasterGaN package is only 9mm x 9mm, with two built-in GaN MOS+ high-voltage drivers. Compared with traditional Si MOS, it has superior thermal performance and switching efficiency. MasterGaN can complement the advantages of ST-ONE converters and help maximize performance and switching frequency.

ST has developed a SEVLONE140W charger reference design with a power density of 25W/in3 and a peak efficiency of over 94%. The PCB size is 55mm*85mm*23.5mm.

The simplified block diagram of ST-ONEHP control is as follows. It can be seen that the IC spans the primary and secondary, has good peripheral components, high integration, and built-in multiple protections.

The built-in MCU description block diagram is as follows, with complete functions, and users can also burn the code themselves.

▶Application scenario diagram

▶Product physical diagram

▶Display board photo

▶Solution diagram

Core technology

• New non-complementary ACF with synchronous rectification, built-in USB-PD 3.1 EPR protocol

• Fewer peripheral devices, integrated 32-bit Cortex M0+ core; 64kB Flash for digital control

• Maximum output power 140W; maximum efficiency >94%•

• High power density >25W/inch³

• Built-in high-voltage startup, X-CAP self-discharge circuit and load switch function, various safety protection circuits;

• Integrated monolithic with reinforced galvanic isolation

Solution specifications

• Input voltage range: 90-264 VAC/47-63Hz

• PCB size: 85x55x23.5 mm, (L x W x H)

• Output: SPR: 5 V @ 3.75 A, 9 V @ 3.75 A, 15 V @ 3.75 A, 20 V @ 5 A

• EPR: 28 V @ 5 A

• AVS: 15 V÷28 V @ 5 A with 100 mV step

• USB-PD 3.1 EPR certified