Current resonant control IC
FA6A30/31N
Datasheet
1. Overview
FA6A30/31N is a switching power supply control IC for LLC current resonant converter.
This IC enables a LLC current resonant converter for wide input voltage range without PFC. It incorporates a 600V start
up circuit, downsizing the circuit and enabling low-power consumption. It also incorporates a 600V high-side driver and low
side driver, which can drive directly both high-side and low-side MOSFETs with 50% duty cycle alternatively.
To ensure high reliability of the power supply, the arm-short prevention function, high-accuracy overload protection
function, and overcurrent protection function with adjustable delay time are provided.
In addition, low standby power is achieved with low standby mode selected by external signal, therefore auxiliary power
supply for standby can be removed.
Since a small package of 16 pins is used and the number of exterior parts is substantially reduced, space- and cost-
saving power supply can be obtained.
2. Features
・For wide input voltage range, LLC current resonant power supply system
can be configured without PFC.
・Integrated high-side and low-side drive circuits, which can be directly
connected to the power MOSFET and operates with 50% duty cycle.
・The integrated startup circuit achieves downsized power supply and lower
power consumption.
・Operating mode can be selected from normal operation mode, low standby
mode, and ultralow standby mode (STB pin)
・During the low standby mode, standby power is lowered by the burst mode
operation.
・Integrated input filter X-capacitor discharge function decreases loss due to
discharge resistance.
・Low consumption current, 0.65mA (Vcc quiescent current).
・Since the dead time is set automatically within the IC, switch-through and
hard switching are prevented.
・Various protection functions: overcurrent (IS pin), overload (VW,FB pin),
overvoltage (VH,VCC pin) and overheat.
・Integrated level-fixed brown-in/out function (VH pin)
・Level-adjustable brown-in/out function (BO pin)
・Various condition settings, including external latch-off function, overcurrent
Pacge:SOP-16
protection (detection by IS pin) delay time setting, operation setting in
standby mode, and PFC with/without setting, can be made (MODE pin).
・Built-in circuit for prevention of low-voltage malfunction (VCC,VB pin)
・Package: SOP-16 (compliant with JEDEC)
Protection functions
Protection by
external signal
(MODE pin)
Overload
(VW,FB pin)
Overcurrent
(IS pin)
Overvoltage
(VCC pin)
VCC voltage drop
(VCC pin)
Type name
FA6A30N
FA6A31N
Auto recovery
Latch
Auto recovery
Latch
Latch
Latch
Latch
Latch
Auto recovery
Auto recovery
© Fuji Electric Co., Ltd. All rights reserved.
Nov., 2021 DS-142J Rev2.2
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