AN2393 Datasheet, PDF (1/35 Pages) STMicroelectronics – Reference design: wide range 200W L6599-based

AN2393
Application note
Reference design: wide range 200W L6599-based
HB LLC resonant converter for LCD TV & flat panels
Introduction
This note describes the performances of a 200 W reference board, with wide-range mains
operation and power-factor-correction (PFC). Its electrical specification is tailored to a
typical high-end application for LCD TV or monitor applications.
The main features of this design are the very low no-load input consumption (<0.5 W) and
the very high global efficiency, better than 87% at full load and nominal mains voltage (115 -
230 V_ac).
The circuit consists of three main blocks; the first is a front-end PFC pre-regulator based on
the L6563 PFC controller. The second stage is a multi-resonant half-bridge converter whose
control is implemented through the STMicroelectronics L6599 resonant controller. A further
auxiliary flyback converter based on the VIPer12A-E off-line primary switcher completes the
architecture. This third block is mainly intended for microprocessor supply and display power
management operations.
Figure 1. L6599 and L6563 200W evaluation board (EVAL6599-200W)
October 2007
Rev 5
1/35
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