This application note describes the performance of a 90 W, wide-range mains, power-factor-corrected, AC-DC adapter demonstration board. Its electrical specification is tailored on a typical hi-end portable computer power adapter. The architecture is based on a two-stage approach; a front-end PFC pre-regulator based on the L6563H TM PFC controller and a downstream LLC resonant half-bridge converter using the new L6599A resonant controller. Thanks to the chipset used, the main aspects of this design are very high efficiency, compliance with ENERGY STAR® Eligibility Criteria (EPA rev. 2.0 EPS), and very low input consumption at no-load (<0.3 W).
The document details the design of a 19 V - 90 W adapter with Power Factor Correction (PFC) for laptop computers. The architecture utilizes a two-stage approach: a front-end PFC pre-regulator based on the L6563H and a downstream LLC resonant half-bridge converter using the L6599A.
| Input mains range | 90+264 Vac - frequency 45 + 65 Hz |
|---|---|
| Output voltage | 19 V at 4.75 A continuous operation |
| Standby mains consumption | <0.3 W at 230 Vac |
| Efficiency at nominal load | Better than 90 % at full load |
The standby mains consumption is less than 0.3 W when operating at 230 Vac.
The adapter supports a universal input mains range from 90 to 264 Vac with a frequency of 45 to 65 Hz.