AN2521 Datasheet, PDF (1/33 Pages) STMicroelectronics – 19 V - 75 W laptop adapter with tracking boost PFC

AN2521
Application note
19 V - 75 W laptop adapter with tracking boost PFC
pre-regulator, using the L6563 and L6668
Introduction
This application note describes the characteristics and features of a 75 W wide range input
mains and power-factor-corrected ac-dc adapter evaluation board. Its electrical specification
is tailored to a typical high-end portable computer power adapter. The distinctive attributes
of this design are the very low standby input consumption (< 0.3 W at 265 V), the excellent
global efficiency (> 85%) for a two stage architecture and the low cost.
Figure 1. L6668 and L6563-75W adapter evaluation board (EVAL6668-75W)
October 2007
Rev 1
1/33
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