June 2016

DocID025877 Rev 2

1/4

For further information contact your local STMicroelectronics sales

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STEVAL-ISA149V1

19 V, 75 W Energy Star-compliant SMPS using the L6563S and

the L6566A

Data brief

Features



Universal input mains range: 90 - 264 Vac,

Freq. 45 - 65 Hz



Output voltage: 19 V @ 4 A continuous

operation



Mains harmonics: in accordance with

EN61000-3-2 Class-D or JEIDA-MITI Class-

D



Standby mains consumption: < 0.14 W @

230 Vac, < 0.085 W @ 115 Vac



Active load average efficiency: greater than

87% without synchronous rectification



EMI: in accordance with EN55022-Class-B



Safety: in accordance with EN60950



Dimensions: 78 x 170 mm, 25 mm

component maximum height



PCB: single side, 70 μm, CEM-1, mixed

PTH/SMT



RoHS compliant

Description

The STEVAL-ISA149V1 implements a 75 W

SMPS reference design, tailored to the

specifications of a typical high-end portable

computer power supply (adapter). The

peculiarities of this design are its very high

efficiency at light load, and excellent global

efficiency for a two-stage architecture. The high

efficiency at high load is achieved without using

synchronized rectification at the secondary side,

resulting in a very cost-effective solution.The

circuit is made up of two stages: a front-end PFC

using the L6563S, and a flyback converter based

on the L6566A. The CV/CC controller TSM1014

allows accurate current limitation on the

secondary side. The flyback stage works as

master and is dedicated to controlling circuit

operation, including standby and protection

functions. Additionally, it switches the PFC stage

helping to achieve excellent efficiency even at

light load, with a low level of complexity.

Efficiency during active load and light load

criteria for both external (EPA rev. 2.0 EPS) and

computer integrated (EPA rev. 4.0

COMPUTERS) power supplies. In addition, this

design is also compliant with the latest computer

requirements.