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.
www.onsemi.com
SOIC−8
CASE 751EB
MARKING DIAGRAM
ON
ZXYTT
Features
FAN6248UV
• 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
U
V
Z
X
Y
= Frequency, H: High, L: Low
= V
Level, C or D
TH_OFF
= Assembly Plant Code
= Year Code
= Two Week Code
= Die Run Code
• Adaptive Parasitic Inductance Compensation to Minimize the Body
Diode Conduction
TT
• SR Current Inversion Detection under Light Load Condition
• Light Load Detection to Increase Dead Time Target
PIN CONNECTIONS
• Adaptive Minimum on Time for Noise Immunity
• Operating Voltage Range up to 30 V
1
2
3
4
8
7
6
5
GATE1
GND
VD1
GATE2
VDD
VD2
• Low Start-up and Stand-by Current Consumption
• Operating Frequency Range from 25 kHz up to 700 kHz
• SOIC−8 Package
VS1
VS2
• High Driver Output Voltage of 10.5 V to Drive All MOSFET Brands
(Top View)
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
ORDERING INFORMATION
See detailed ordering and shipping information on page 3 of
this data sheet.
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
© Semiconductor Components Industries, LLC, 2017
1
Publication Order Number:
January, 2018 − Rev. 2
FAN6248HC/D