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November 2011 Doc ID 022539 Rev 1 1/5
5
EVL6566A-75WES4
19 V - 75 W SMPS compliant with latest Energy Star® criteria
using the L6563 and the L6566A
Features
■Universal input mains range: 90 - 264 Vac -
Frequency 45 - 65 Hz
■Output voltage: 19 V @ 4 A continuous
operation
■Mains harmonics: Acc. to 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: better than 87%
without synchronous rectification
■EMI: According to EN55022-Class-B
■Safety: According to EN60950
■Dimensions: 78x170 mm, 25 mm component
maximum height
■PCB: Single side, 70 µm, CEM-1, Mixed
PTH/SMT
Description
This board implements a 75 W SMPS reference
design, tailored to the specifications of a typical
hi-end portable computer power supply (adapter).
The peculiarities of this design are the very high
efficiency at light load and the excellent global
efficiency for a two-stage architecture. The high
efficiency at high load is achieved without using
synchronized rectification at secondary side and
therefore offers a very cost effective solution.
The circuit is made up of two stages: a front-end
PFC using the L6563 and a flyback converter
based on the L6566A. The CV/CC controller
TSM1014 allows the correct current limitation on
the secondary side. The flyback stage works as
master and it is dedicated to controlling the circuit
operation, including the standby and protections.
Additionally, it switches the PFC stage on and off
by means of a dedicated pin (VCC_PFC),
therefore helping to achieve an excellent
efficiency even at light load, with low complexity.
Efficiency during active load and light load
operation are compliant with Energy Star®
Eligibility 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.
Figure 1. EVL6566A-75WES4 Energy Star® compliant adapter demonstration board
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EVL6566A-75WES4
2/5 Doc ID 022539 Rev 1
Figure 2. EVL6566A-75WES4 electrical diagram
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EVL6566A-75WES4
Doc ID 022539 Rev 1 3/5
Figure 3. Light load efficiency measurements
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Revision history EVL6566A-75WES4
4/5 Doc ID 022539 Rev 1
Revision history
Table 1. Document revision history
Date Revision Changes
28-Nov-2011 1 Initial release.
EVL6566A-75WES4
Doc ID 022539 Rev 1 5/5
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