© Semiconductor Components Industries, LLC, 2017
January, 2018 − Rev. 2
1 Publication Order Number:
FAN6248HC/D
FAN6248HC/HD/LC/LD
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.
According to the operating frequency and turn-off threshold voltage,
FAN6248 has four different versions − FAN6248HCMX,
FAN6248HDMX, FAN6248LCMX, FAN6248LDMX.
Features
• Highly Integrated Self-contained Control of Synchronous Rectifier
with a Minimum External Component Count
• Optimized for LLC Resonant Converter
• Anti Shoot-through Control for Reliable SR Operation
• Separate 100 V 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 to Increase Dead Time Target
• 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 25 kHz 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. 350 mA)
• These Devices are Pb−Free, Halogen Free and are RoHS Compliant
Applications
• High Power Density Laptop Adapter
• High Power Density Adapter
• Large Screen LCD−TV, PDP−TV, RP−TV Power
• High-efficiency Desktop and Server Power Supplies
• Networking and Telecom Power Supplies
• High Power LED Lighting
SOIC−8
CASE 751EB
See detailed ordering and shipping information on page 3 o
this data sheet.
ORDERING INFORMATION
www.onsemi.com
MARKING DIAGRAM
PIN CONNECTIONS
ON
ZXYTT
1
2
3
VDD
GATE1
GND
VD2
VS1
GATE2
4
VD1
8
7
6
5
VS2
(Top View)
U = Frequency, H: High, L: Low
V= V
TH_OFF
Level, C or D
Z = Assembly Plant Code
X = Year Code
Y = Two Week Code
TT = Die Run Code
FAN6248UV
