19 V - 90 W adapter with PFC for laptop computers using the
L6563H and L6699
Features
• Universal input mains range: from 90 to 264
Vac - frequency from 45 to 65 Hz
• Output voltage: 19 V at 4.75 A continuous
operation
• Mains harmonics: meets EN61000-3-2
Class-D and JEITA-MITI Class-D
• No load mains consumption: in accordance
with ENERGY STAR 2.0 for external power
supplies
• Average efficiency: in accordance with
ENERGY STAR 2.0 for external power
supplies
• Light load efficiency: in accordance with ErP
Lot 6 Tier2 requirements
• EMI: within EN55022-Class-B limits
• Safety: meets EN60950 standards
• Dimensions: 65 x 151 mm, 25 mm maximum
component height
• PCB: double-side, 70 µm, FR-4, mixed
PTH/SMT
• RoHS compliant
Description
The STEVAL-ISA138V1 solution evaluation
board is a 90 W, wide-range mains, power-factor
corrected, AC-DC adapter. Its electrical
specifications are tailored to 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 L6699 resonant controller. Thanks
to the chipset used, the main features of this
design are very high overall efficiency,
compliance with ENERGY STAR® eligibility
criteria (EPA rev. 2.0 EPS), high efficiency even
at light load, and compliance with the new ErP
Lot 6 Tier2 requirements. No load input power
consumption is very low also, well within the
international regulation limits.
The controller of the LLC stage is the L6699,
integrating innovative functions such as self-
adjusting adaptive dead-time, anti-capacitive
mode protection and proprietary "safe-start"
procedure to prevent hard switching at startup.
November 2013 DocID025490 Rev 1 1/4
For further information contact your local STMicroelectronics sales
office
www.st.com
