Kit Contents; Specification; Device Information - Texas Instruments UCG28826EVM-093 User Manual

Evaluation Module Overview
1 Evaluation Module Overview
1.1 Introduction
The UCG28826EVM-093 facilitates the evaluation of UCG28826, Integrated GaN FET with controller, within an
AC-DC QR flyback power converter. The EVM is designed for a universal AC input range of 90VAC-264VAC
and follows the USB PD 3.0 output protocol of 20V/15V/9V/5V. This user guide provides a high-voltage
safety overview, recommended test setup, resulting efficiency results, thermals, waveforms, and conducted EMI
performance.

1.2 Kit Contents

• 65W USB-C QR Flyback Evaluation Module
• Quick Start Guide
• High Voltage Notice

1.3 Specification

Input
90VAC-264VAC
47-63Hz

1.4 Device Information

The UCG28826 is a high frequency, quasi-resonant (QR) AC/DC flyback converter with integrated 650V primary-
side GaN FET suitable for use in power supplies up to 65W without PFC and 120W with a PFC front-end. This
device gives benefit of GaN integration to achieve high power density designs with high switching frequency
up to 500kHz. The UCG28826 features industry's first auxless flyback architecture with self-bias to give a
compact and low cost power supply design without the need for an auxiliary winding in the transformer. The
self bias feature reduces losses to improve efficiency in wide output voltage applications like USB-PD chargers
by eliminating the need for a low dropout regulator (LDO) and its associated losses to generate the device
bias. The UCG28826 supports continuous conduction mode (CCM) operation for upto 4msec for transient output
power conditions of up to 130W (two times the 65W nominal output power) in low-line input conditions without
the need for a transformer designed for such transient load conditions, saving space and cost. This device
also includes frequency foldback and burst nodes for higher efficiency operation during light load and no-load
conditions, respectively. The X-cap discharge circuit discharges the X-capacitor in the input EMI filter to 0V
within less than 1sec to prevent the user from an electric shock at the time of unplugging the power supply
from the wall socket. The UCG28826 overcomes the system design limitations of integrated converters by
offering resistor programmable options for maximum flexibility to user to optimize performance at the desired
operating point. The device also includes many in-built protections to output over-voltage, over-current, overload,
short-circuit and over-temperature conditions with auto-restart and latch response for a robust power supply
design preventing any damage during such fault conditions.
2 Using the UCG28826EVM-093 65W USB-C PD High-Density GaN
Integrated Quasi-Resonant Flyback Converter
Output
20V/3.25A, 15V/3.00A, 9V/3.00A, 5V/3.00A
Copyright © 2025 Texas Instruments Incorporated
Max Output Power
65W
SLUUD60A – OCTOBER 2024 – REVISED FEBRUARY 2025
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