Features
• 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 Brownin/
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

Application
• USB-PD chargers and adapters up to 100 W for smartphones, tablets, laptops
and other handheld equipment

Description
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.