UCC25640X Benefits in LED Lighting PSU
Abstract
TI developed LLC controllers over the past 15 years and also developed the LLC controller (TPS9202X) which dedicates for LED lighting PSU application. TI has several years experience in LLC topology and LED lighting PSU. The previous generation devices UCC256302 also promoted to several key LED lighting PSU customers and receives valuable feedback. This application note is a compilation of lessons learned to develop the UCC25640X product and introduces the UCC25640X benefits in LED lighting PSU.
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1 Introduction
LLC topology normally used in the isolation DC to DC stage for the 100W to approximately KW power rating because LLC is the soft switching topology to gain the best efficiency entire loading. This benefit is more significant in the lighting applications because it requires the ambient temperature up to 90℃ but without the air flow for thermal dissipation the LLC topology needs the best efficiency to avoid the power stage component over temperate stress. However, the LLC resonant tank design is not designed for wide input or output voltage range. This application note introduces the resonant tank design for lighting application and how UCC25640X addresses several limitations for the lighting application.
Figure 1-1 UCC25640X Simplified Schematic