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.