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February 2011 Doc ID 18376 Rev 1 1/47
AN3329
Application note
170 W power supply with PFC and standby supply for flat TV
using the L6564, L6599A, and Viper27LN
Introduction
This application note describes the characteristics and features of a 170 W, wide input
mains range, power-factor-corrected, demonstration board for flat TVs or industrial
applications. The electrical specifications are tailored to a typical flat TV.
The architecture is made up of three stages: a front-end PFC pre-regulator based on the
L6564 TM (transition mode) boost PFC controller and a downstream LLC resonant half
bridge converter stage, built around the new L6599A resonant controller, which provides two
regulated output voltages at 12 V and 24 V. In addition, a flyback-based standby supply
delivers 10 W to a 5 V output. Thanks to the chipset used, this design achieves very high
efficiency, compliant with ENERGY STAR
®
eligibility criteria (EPA rev. 2.0 EPS), as well as
very low input consumption during standby operation.
Figure 1. EVL170W-FTV: 170 W demonstration board
www.st.com
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