2nd Generation LLC Current Resonant Control IC,
“FA6A00N Series”
CHEN Jian* YAMADAYA Masayuki* SHIROYAMA Hironobu㾙
A B S T R A C T
LLC current resonant power supply, which is characterized by soft switching, resonance control with a duty ratio
of 50% and leakage transformer structure, is suitable for efficiency improvement, noise reduction and profile lower-
ing in switching power supply. Fuji Electric has developed the 2nd generation “FA6A00N Series,” which inherits the
characteristics of the 1st generation LLC current resonant control IC, “FA5760N,” and is enhanced with lower standby
power and improved protective functions. It integrates the world’s first high-precision secondary side over-load pro-
tection function while further reducing the standby power by approximately 20%. For the over-current protection
function, the delay time can be externally adjusted.
1. Introduction
standby converter and allows a power management
system configuration that offers high efficiency, low
standby power and compactness. This has expanded
the scope of its application such that it is adopted to a
power supply of about 50 W without a PFC converter.
Fuji Electric has recently developed the “FA6A00N
Series,” the 2nd-generation LLC current resonant con-
trol IC. With the characteristics of the 1st-generation
LLC current resonant control IC “FA5760N” inherited,
it is enhanced with a lower standby power, improved
protective functions, higher quality and lower system
cost and offers a higher degree of design freedom.
Switching power supply products, which are used
in various types of electronic equipment, are rapidly
being improved in terms of efficiency, noise reduction
and low profile to meet the demands for energy ef-
ficiency and space saving. An LLC current resonant
power supply is characterized by its use of high-effi-
ciency, low-noise soft switching technology and low-
profile leakage transformer structure. These charac-
teristics facilitate efficiency improvement, noise reduc-
tion and profile lowering and make it suitable for use
as a power supply of 100 to 500 W, which is a medium
capacity range for a switching power supply. The LLC
current resonant power supply, however, is prone to a
switching shoot-through phenomenon*1 during a start-
up, heavy load conditions or low input voltage condi-
tions. The power supply has problems including a
breakdown of a power metal-oxide-semiconductor field-
effect transistor (MOSFET) due to this phenomenon
and efficiency degradation with a light load due to an
excitation current, and these factors limited its scope
of application.
2. Overview of Product
Figure 1 shows the external appearance of the
FA6A00N Series and Fig 2 the block diagram. Table
1 lists the major ratings, Table 2 the major functions
and Table 3 shows the product lineup. The following
outlines the LLC current resonant control IC of the
FA6A00N Series.
In order to solve these problems, Fuji Electric
commercialized “FA5760N,” an LLC current reso-
nant control IC that uses its unique new control sys-
tem. FA5760N is an LLC resonant converter that
eliminates the need for a PFC converter and dedicated
1: Switching shoot-through phenomenon: a phenomenon
in which, when a current flows through the body diode
of one power MOSFET in a bridge switching circuit, the
opposing power MOSFET turns on to instantaneously
generate a large current.
*
Electronic Devices Business Group, Fuji Electric Co., Ltd.
Sales Group, Fuji Electric Co., Ltd.
*
㾙
Fig.1 “FA6A00N Series”
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