This application note describes the performance 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 Vac). 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.
This document describes a 200W reference design for a wide-range LLC resonant converter intended for LCD TV and flat panel applications. The design features a front-end PFC pre-regulator based on the L6563 controller, a multi-resonant half-bridge converter controlled by the L6599, and an auxiliary flyback converter based on the VIPer12A-E for microprocessor supply and power management.
| Input mains range | 90 to 264 V |
|---|---|
| Output voltage 24V | 6 A continuous |
| Output voltage 12V | 5 A continuous |
| Output voltage 3.3V | 0.7 A continuous |
| Output voltage 5V | 1 A continuous |
| Stand-by consumption | Typical 0.5 W @230 V |
| Overall efficiency | better than 88% at full load |
| EMI compliance | EN55022-class B |
| Safety compliance | EN60950 |
The universal input mains range is 90 to 264 V and frequencies between 45 and 65 Hz.
The outputs are 24V@6A, 12V@5A, [email protected], and 5V@1A continuous operation.
The overall efficiency is better than 88% at full load.