STMicroelectronics ST-ONEMP

The ST-ONEMP is the world’s first digital controller embedding ARM Cortex M0+ core, an offline programmable controller with synchronous rectification, and USB PD PHY in a single package. Such a system is specifically designed to control ZVS non-complementary active clamp flyback converters to create high power density chargers and adapters with a first USB-PD interface and a second output.

The device includes an active clamp flyback controller and its HV startup on the primary side, a microcontroller and all the peripherals required to control the conversion and the USB-PD communication on the secondary side. The two sides are connected through an embedded galvanically isolated dual communication channel. By using a novel non-complementary control technique and specifically designed power modes the device allows to reach both high efficiency and low no load power consumption

The device is delivered with a pre-loaded firmware which handles both the power conversion and the communication protocols for USB-PD including optional PPS and electronically marked cable management.

The output power and available PDOs on the USB-PD port can be changed according to a power sharing pin input to allow power sharing with a second output.

A dedicated memory stores a default device configuration during factory process. The user can change or adapt this memory area to fit the final product specifications.

• ZVS non-complementary active clamp flyback controller with synchronous rectification and USB-PD 3.1 PPS interface
• ARM® 32-bit Cortex®-M0+ MCU with 64 kB flash memory for digital power control and USB protocol
  • FW programmable secondary side MCU controls both
    synchronous rectifier and ZVS active clamp flyback on the primary side
    to improve system efficiency in every condition
  • High switching frequency operations in
    companion with MasterGaN power stage allow to use small size magnetic components,
    including planar transformers
• Reinforced galvanically isolated dual communication channel compliant with IEC 62368-1:
  • 4 kV pk transient voltage
  • 9.6 kV pk 1min hipot type testing
  • 6.4 kV pk 1s hipot production
    testing
• 800 V high voltage startup with integrated input voltage sensing and Brown-in/out functions
• Active input filter capacitor discharge circuitry for reduced standby power compliant with IEC 62368-1
• Fully Integrated USB-PD PHY with 24 V tolerant protection, and integrated load switch driver