STEVAL-ISA138V1

19 V - 90 W adapter with PFC for laptop computers using the

L6563H and L6699

Data brief

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