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FAN6248
Advanced Synchronous Rectifier
Controller for LLC Resonant Converter
The FAN6248 is an advanced synchronous rectifier (SR) controller that is
optimized for LLC resonant converter topology with minimum external
components. It has two driver stages for driving the SR MOSFETs which
are rectifying the outputs of the secondary transformer windings. The two
gate driver stages have their own sensing inputs and operate
independently of each other. The adaptive parasitic inductance
compensation function minimizes the body diode conduction maximizing
the efficiency. The advanced control algorithm allows stable SR
operation over entire load range. FAN6248 has two different versions -
FAN6248HAMX having higher turn-off threshold voltage and
FAN6248HBMX having lower turn-off threshold voltage.
Features
Highly integrated self-contained control of synchronous rectifier with
a minimum external component count
www.onsemi.com
PACKAGE PICTURE
SOIC-8 NB
CASE 751
.
MARKING DIAGRAM
Optimized for LLC resonant converter
Anti shoot-through control for reliable SR operation
Separate 100V rated sense inputs for sensing the drain and source
voltage of each SR MOSFET
Adaptive parasitic inductance compensation to minimize the body
diode conduction
SR current inversion detection under light load condition
Light load detection
Adaptive minimum on time for noise immunity
Operating voltage range up to 30 V
Low start-up and stand-by current consumption
Operating frequency range from 25kHz up to 700 kHz
SOIC−8 Package
High driver output voltage of 10.5 V to drive all MOSFET brands to
the lowest R
DS_ON
Low operating current in green mode (typ. 350uA)
GATE1
1
GND
VD1
VS1
U
V
Z
X
Y
TT
= Frequency, H:High
= Vth_off level, A or B
= Assembly Plant Code
= Year Code
= Two Week Code
= Die Run Code
PIN CONNECTIONS
8
GATE2
7
VDD
6
5
VD2
VS2
2
3
4
TBD
Top Mark
(Top View)
Applications
High power density laptop adapter
ORDERING INFORMATION
See detailed ordering and shipping information on page 3 of
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