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 www.onsemi.com 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 SOIC8 conduction maximizing the efficiency. The advanced control CASE 751EB 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, MARKING DIAGRAM FAN6248HDMX, FAN6248LCMX, FAN6248LDMX. ON ZXYTT Features FAN6248UV Highly Integrated Self-contained Control of Synchronous Rectifier with a Minimum External Component Count Optimized for LLC Resonant Converter U = Frequency, H: High, L: Low Anti Shoot-through Control for Reliable SR Operation V= V Level, C or D TH OFF Separate 100 V Rated Sense Inputs for Sensing the Drain and Source Z = Assembly Plant Code X = Year Code Voltage of each SR MOSFET Y = Two Week Code Adaptive Parasitic Inductance Compensation to Minimize the Body TT = Die Run Code Diode Conduction SR Current Inversion Detection under Light Load Condition PIN CONNECTIONS Light Load Detection to Increase Dead Time Target Adaptive Minimum on Time for Noise Immunity 1 8 GATE1 GATE2 Operating Voltage Range up to 30 V GND 2 7 VDD Low Start-up and Stand-by Current Consumption 3 6 VD1 VD2 Operating Frequency Range from 25 kHz up to 700 kHz 4 5 SOIC8 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 A) These Devices are PbFree, 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 LCDTV, PDPTV, RPTV 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/DFAN6248HC/HD/LC/LD M2 Optional Roffset2 Bridge Diode Q EMI PFC 1 V C AC in Filter Stage C L r r V O Q 2 L p C R O O Optional M1 LLC Controller Shunt Regulator Figure 1. Typical Application Schematic of FAN6248 VDD 7.2V 4.5/4.2V V D1 HGH GREEN V D2 HGH I I OFFSET1 OFFSET2 V TH HGH DLY EN DLY EN V TH HGH Adaptive DQ Q D VD1 Adaptive VD2 turnon turnon V V TH ON TH ON Turnon Turnon debounce debounce CLR Q Q CLR Turnoff Turnoff V V TH OFF1,2 TH OFF1,2 VS1 VS2 Turnoff Turnoff SRC INV SRC INV Trigger Trigger Blanking Blanking GATE1 GATE2 GATE1 GATE2 SR Current SRC INV V Inversion detect D1 HGH Green Mode DLY EN V GREEN V D1 HGH D2 HGH Light Load I OFFSET1 Detection GND Figure 2. Internal Block Diagram of FAN6248 www.onsemi.com 2 FAN6248 G1 G2 GND VDD VD1 VD2 VS1 VS2