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SLUU361A – April 2009 – Revised November 2018
Copyright © 2009–2018, Texas Instruments Incorporated
LLC Resonant Half-Bridge Converter, 300-W Evaluation Module
User's Guide
SLUU361A – April 2009 – Revised November 2018
LLC Resonant Half-Bridge Converter,
300-W Evaluation Module
1
Introduction
The UCC25600 evaluation module, EVM (HPA341), is a 300-W LLC resonant half-bridge converter,
providing a regulated output voltage nominally at 12 V at maximum 300 W of load power with reinforced
isolation of AC-DC off-line application between the primary and the secondary, operating from a DC
source of 390 V. The EVM uses the UCC25600 resonant half-bridge controller which integrates built-in
state of the art efficiency boost features with high level protection features to provide cost effective
solutions for LLC resonant half-bridge converter applications. The secondary side uses two daughter
cards, HPA410, with diodes to make rectification.
Proper precautions must be taken when working with the EVM. High voltage levels, over 390 V, and
temperature higher than 70°C are present on the EVM when it is powered on and after power off for a
short time as well. Forced air cooling is required when the EVM is powered on.
2
Description
2.1
Typical Applications
LLC resonant half-bridge converters are seen in applications such as TVs. The converters produce higher
power conversion efficiency from their zero-voltage switching. Such converters are intended to extend to
low-voltage applications such as ATX12 power supplies for computers and servers to obtain better energy
conservation and savings. The EVM provides a platform to evaluate UCC25600 LLC resonant controller
from a PFC input voltage and 12-V output rated at 300-W output power.
2.2
Features
The UCC25600EVM, HPA341, features:
•
300-W Output Power Rating
•
High Efficiency 92% Peak and Over 91% at Full Load
•
Regulated Output Nominal of 12 V
•
Input DC Voltage of 390 V
•
Plenty of Test Points to Facilitate the Device Evaluation
•
Over-Current Protection
•
Output Over-Voltage Protection
•
Burst Operation at Light Load
