FAN6248 Rectifier Controller Datasheet

FAN6248 Datasheet, PDF, Equivalent


Part Number

FAN6248

Description

Advanced Synchronous Rectifier Controller

Manufacture

ON Semiconductor

Total Page 15 Pages
Datasheet
Download FAN6248 Datasheet


FAN6248
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 RDS_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
www.onsemi.com
SOIC−8
CASE 751EB
MARKING DIAGRAM
ON ZXYTT
FAN6248UV
U = Frequency, H: High, L: Low
V = VTH_OFF Level, C or D
Z = Assembly Plant Code
X = Year Code
Y = Two Week Code
TT = Die Run Code
PIN CONNECTIONS
GATE1 1
GND 2
VD1 3
VS1 4
8 GATE2
7 VDD
6 VD2
5 VS2
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 3 of
this data sheet.
© Semiconductor Components Industries, LLC, 2017
January, 2018 − Rev. 2
1
Publication Order Number:
FAN6248HC/D

FAN6248
VAC
EMI
Filter
Bridge
Diode
PFC
Stage
Cin
FAN6248HC/HD/LC/LD
Roffset2
M2
Optional
Q1
Cr Lr
Q2
Lp
VO
CO RO
LLC
Controller
Optional
M1
Shunt
Regulator
Figure 1. Typical Application Schematic of FAN6248
VDD
IOFFSET1
VTH_HGH
VD1
VTH_ON
VS1
VTH_OFF1,2
Turn−off
Trigger
Blanking
7.2V
VD1_HGH
DLY_EN
Adaptive
turn−on
debounce
DQ
Turn−on
CLR Q
Turn−off
GREEN
4.5/4.2V
VD2_HGH
DLY_EN
QD
Adaptive
Q CLR
Turn−on
turn−on
debounce
Turn−off
SRC_INV
SRC_INV
IOFFSET2
VTH_HGH
VTH_ON
VD2
VTH_OFF1,2
Turn−off
Trigger
Blanking
VS2
GATE1
VD1_HGH
Green Mode
GREEN
GATE1
GATE2
VD1_HGH
VD2_HGH
IOFFSET1
SR Current
Inversion detect SRC_INV
Light Load
Detection
GND
Figure 2. Internal Block Diagram of FAN6248
GATE2
DLY_EN
www.onsemi.com
2


Features FAN6248HC/HD/LC/LD Advanced Synchronous Rectifier Controller for LLC Resonant Converter The FAN6248 is an advanced sy nchronous rectifier (SR) controller tha t is optimized for LLC resonant convert er topology with minimum external compo nents. It has two driver stages for dri ving the SR MOSFETs which are rectifyin g the outputs of the secondary transfor mer windings. The two gate driver stage s have their own sensing inputs and ope rate independently of each other. The a daptive parasitic inductance compensati on function minimizes the body diode co nduction maximizing the efficiency. The advanced control algorithm allows stab le SR operation over entire load range. According to the operating frequency a nd turn-off threshold voltage, FAN6248 has four different versions − FAN6248 HCMX, FAN6248HDMX, FAN6248LCMX, FAN6248 LDMX. Features • Highly Integrated Se lf-contained Control of Synchronous Rec tifier with a Minimum External Componen t Count • Optimized for LLC Resonant Converter • Anti Shoot-through.
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