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FA6A10N

2nd Generation LLC Current Resonant Control IC, “FA6A00N Series”

Fuji Electric 

2nd Generation LLC Current Resonant Control IC,

“FA6A00N Series”

CHEN Jian* YAMADAYA Masayuki* SHIROYAMA Hironobu㾙

ABSTRACT

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

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.

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.

㾙 Sales Group, Fuji Electric Co., Ltd.

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.

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.

Fig.1 “FA6A00N Series”

245

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