FAN6248HC ONSEMI | Alldatasheet

Document overview

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Technical content

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 V oltage 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 V oltage 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 V oltage of 10.5 V to Drive All MOSFET Brands to the Lowest RDS_ON
  • Low Operating Current in Green Mode (typ. 350 /C0109A)
  • 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 of this data sheet.

ORDERING INFORMATION

www.onsemi.com MARKING DIAGRAM PIN CONNECTIONS ON ZXYTT VDD GATE1 GND VD2 VS1 GATE2 VD1

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

www.onsemi.com PIN DESCRIPTION Pin Number Pin Name Description

1 GATE1 Gate drive output for SR1

2 GND Ground

3 VD1 Synchronous rectifier drain sense input. A IOFFSET1 current source flows out of the DRAIN pin such that an external series resistor can be used to adjust the synchronous rectifier turn-off threshold. The IOFFSET1 current source is turned off when VDD is under-voltage or when switching is disabled in green mode

4 VS1 Synchronous rectifier source sense input for SR1

5 VS2 Synchronous rectifier source sense input for SR2

6 VD2 Synchronous rectifier drain sense input. A IOFFSET2 current source flows out of the DRAIN pin such that an external series resistor can be used to adjust the synchronous rectifier turn-off threshold. The IOFFSET2 current source is turned off when VDD is under-voltage or when switching is disabled in green mode

7 VDD Supply Voltage

8 GATE2 Gate drive output for SR2

ORDERING AND SHIPPING INFORMATION Ordering Code Device Marking VTH_OFF1 / VTH_OFF2 Package Shipping† FAN6248HCMX FAN6248HC 25 mV / 50 mV SOIC−8 2500 / Tape & Reel FAN6248HDMX FAN6248HD 0 mV / 25 mV SOIC−8 2500 / Tape & Reel FAN6248LCMX FAN6248LC 25 mV / 50 mV SOIC−8 2500 / Tape & Reel FAN6248LDMX FAN6248LD 0 mV / 25 mV SOIC−8 2500 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.

www.onsemi.com MAXIMUM RATINGS Symbol Parameter Min Max Unit VDD Power Supply Input Pin Voltage −0.3 30 V VD1, VD2 Drain Sense Input Pin Voltage −1 100 V VGATE1, VGATE2 Gate Drive Output Pin Voltage −0.3 30 V VS1, VS2 Source Sense Input Pin Voltage −0.4 0.4 V PD Power Dissipation (TA =2 5°C) 0.625 W /C0081JA Thermal Resistance (Junction-to-Ambient Thermal) 165 °C/W TJ Operating Junction Temperature −40 150 °C TSTG Storage Temperature Range −60 150 °C TL Lead Temperature (Soldering) 10 Seconds 260 °C ESD Electrostatic Discharge Capability Human Body Model, ANSI / ESDA / JEDEC JS−001−2012 4 kV Charged Device Model, JESD22−C101 1.75 Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. All voltage values are with respect to the GND pin . THERMAL CHARACTERISTICS Symbol Rating Value Unit R/C0121JT Thermal Characteristics 22 /C0095C/W R/C0113JA Thermal Characteristics 165 /C0095C/W RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit VDD VDD Pin Supply Voltage to GND (Note 2) 0 27 V VD1 ,VD2 Drain Sense Input Pin Voltage −0.7 100 V VS1 VS2 Source Sense Input Pin Voltage −0.4 0.4 V TA Operating Ambient Temperature (Note 3) −40 +125 °C Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. 2. Allowable operating supply voltage V DD can be limited by the power dissipation of FAN6248 related to switching frequency, load capacitance and ambient temperature. 3. Allowable operating ambient te mperature can be limited by the power dissipatio n of FAN6248 related to switching frequency, lo ad capacitance on GATE pin and VDD.

www.onsemi.com ELECTRICAL CHARACTERISTICS (VDD = 12 V and TJ = −40°C to +125°C unless otherwise specified) Symbol Parameter Conditions Min Typ Max Unit INPUT VOLTAGE VDD_ON Turn-On Threshold VDD rising 4.2 4.5 4.7 V VDD_OFF Turn-Off Threshold VDD falling 4.0 4.2 4.4 VDD_GATE_ON* SR Gate Enable Threshold Voltage VDD rising 7.2 V IDD_OP Operating Current fSW = 100 kHz, CGATE = 3.3 nF 7 8.5 10 mA IDD_SRARTUP VDD = VDD_ON − 0.1 V 200 /C0109A IDD_GREEN Operating Current in Green Mode VDD = 12 V (no switching) 350 500 /C0109A DRAIN VOLTAGE SENSING SECTION (VD1 =V D2) VOSI* Comparator Input Offset Voltage −1 0 1 mV IOFFSET* IOFFSET1 and IOFFSET2 Maximum of adaptive offset current (15 steps, 9 /C0109A resolution) IOFFSET=IOFFSET_STEP15 112.5 135 157.5 /C0109A VTH_ON Turn-On Threshold RDRAIN = 0 /C0087 (includes comparator input offset voltage) −290 −240 −190 mV tON_DLY* Turn on delay for de-bounce time when turn-on delay mode is disabled by detecting normal SR current From VD1 falling below VTH_ON to VGATE rising above VG_HG (With 50 mV overdrive), CGATE =0n F 80 ns tON_DLY2_H* Turn on delay for de-bounce time when turn-on delay mode is enabled by detecting SR current inversion for HC and HD version From VD1 falling below VTH_ON to VGATE rising above VG_HG (With 50 mV overdrive), CGATE =0n F 850 ns tON_DLY2_L* Turn on delay for de-bounce time when turn-on delay mode is enabled by detecting SR current inversion for LC and LD version From VD1 falling below VTH_ON to VGATE rising above VG_HG (With 50 mV overdrive), CGATE =0n F 1100 ns VTH_OFF1_C* First Level Turn-Off Threshold for HC and LC version RDRAIN = 0 /C0087 (includes comparator input offset voltage) 25 mV VTH_OFF2_C* Second Level Turn-Off Threshold for HC and LC version RDRAIN = 0 /C0087 (includes comparator input offset voltage) 50 mV VTH_OFF1_D* First Level Turn-Off Threshold for HD and LD version RDRAIN = 0 /C0087 (includes comparator input offset voltage) 0 mV VTH_OFF2_D* Second Level Turn-Off Threshold for HD and LD version RDRAIN = 0 /C0087 (includes comparator input offset voltage) 25 mV tOFF_DLY* Comparator Delay of VTH_OFF1 From VD1 rising above VTH_OFF to VGATE falling below VG_LW (With 10 mV overdrive), CGATE =0n F 50 ns VTH_HGH Drain Voltage High Detect Threshold VD1 Rising 0.80 1 1.20 V tDB_HGH_H* VTH_HGH Detection Blanking Time for HC and HD version From VD1 falling below VTH_ON 540 ns tDB_HGH_L* VTH_HGH Detection Blanking Time for LC and LD version From VD1 falling below VTH_ON 1 /C0109s VOFF_FORCE* Forced Turn-off Threshold VD1 > VOFF_FORCE = VTH_HGH_EN 1 V MINIMUM ON-TIME AND MAXIMUM ON-TIME KTON* Adaptive Minimum On Time Ratio Ratio between tON_MIN and SR conduction time of previous switching cycle 25 % tON_MIN_LH* Minimum On-Time Lower Limit for HC and HD version tON_MIN_UH 200 ns tON_MIN_UH Minimum On-Time Upper Limit for HC and HD version 0.96 1.2 1.44 /C0109s

www.onsemi.com ELECTRICAL CHARACTERISTICS (VDD = 12 V and TJ = −40°C to +125°C unless otherwise specified) (continued) Symbol UnitMaxTypMinConditionsParameter MINIMUM ON-TIME AND MAXIMUM ON-TIME tON_MIN_LL* Minimum On-Time Lower Limit for LC and LD version tON_MIN_UL 0.4 /C0109s tON_MIN_UL Minimum On-Time Upper Limit for LD and LD version 3.2 4 4.8 /C0109s tSR_CNDT_H Minimum SR Conduction Time to enable SR for HC and HD version The duration from turn-on trigger to V DS rising above VTH_HGH 380 600 820 ns tSR_CNDT_L Minimum SR Conduction Time to enable SR for LC and LD version The duration from turn-on trigger to V DS rising above VTH_HGH 0.85 1.2 1.65 /C0109s tSR_MAX_H* Maximum SR Turn-on Time for HC and HD version 15 /C0109s tSR_MAX_L* Maximum SR Turn-on Time for LC and LD version 30 /C0109s REGULATED DEAD TIME tDEAD_H* Dead time regulation target for HC and HD version From VGATE falling below VG_LW to VDS rising above VTH_HGH 280 ns tDEAD_H_LIGHT* Dead time regulation target under light load condition for HC and HD version From VGATE falling below VG_LW to VDS rising above VTH_HGH 320 ns tDEAD_L* Dead time regulation target for LC and LD version From VGATE falling below VG_LW to VDS rising above VTH_HGH 320 ns tDEAD_L_LIGHT* Dead time regulation target under light load condition for LC and LD version From VGATE falling below VG_LW to VDS rising above VTH_HGH 360 ns tTSDT* Too small dead time threshold to speed up IOFFSET change (Speed up 2 times) From VGATE falling below VG_LW to VDS rising above VTH_HGH 50 ns KINV* Adaptive SR current inversion detection time Ratio between TINV and SR conduction time of previous switching cycle VGATE > VG_HG and VDS > VTH_OFF KINV = 0.25 × KTON 6.25 % /C0104INV_EXT* Normal switching cycles without capacitive current spike to exit SR current inversion detection state which has t ON_DLY2 31 cycle GREEN MODE CONTROL tGRN_ENT_H Non-Switching Period to Enter Green Mode for HC and HD version Non switching cycles between burst switching bundles 60 80 100 /C0109s tGRN_ENT_L Non-Switching Period to Enter Green Mode for LC and LD version Non switching cycles between burst switching bundles 120 160 200 /C0109s tGRN_ENT_DBNC_H De-bounce time to Enter Green Mode for HC and HD version De-bounce time after tGRN.ENT_H 130 180 230 /C0109s tGRN_ENT_DBNC_L De-bounce time to Enter Green Mode for LC and LD version De-bounce time after tGRN_ENT_L 240 320 400 /C0109s tGRN_EXT_H Non-Switching Period to Exit Green for HC and HD version Non switching cycles between burst switching bundles 30 40 50 /C0109s tGRN_EXT_L Non-Switching Period to Exit Green Mode for LC and LD version Non switching cycles between burst switching bundles 60 80 100 /C0109s /C0104CSW_EXT Continuous switching cycles to exit Green Mode for HC, HD, LC and LD version 4 7 10 cycle

www.onsemi.com ELECTRICAL CHARACTERISTICS (VDD = 12 V and TJ = −40°C to +125°C unless otherwise specified) (continued) Symbol UnitMaxTypMinConditionsParameter GREEN MODE CONTROL tS_NORMAL_H Switching period to be recognized as normal switching for HC and HD version 13 20 27 /C0109s tS_NORMAL_L Switching period to be recognized as normal switching for LC and LD version 27 40 53 /C0109s OUTPUT DRIVER SECTION VGATE_MAX Gate Clamping Voltage 12 V < VDD < 25 V 9 10.5 12 V VOL Output Voltage Low VDD =1 2V , VD1 =V D2 =2V , IGATE =5 0m A 1.5 V VOH Output Voltage High VDD =1 2V , IGATE = −50 mA 7 V ISOURCE* Peak Source Current for Turning On VDD =1 2V , VGATE =2V 0.7 A ISINK* Peak Sink Current for Turning Off VDD =1 2V , VGATE =7V 1.4 A tR* Rise Time VDD =1 2V , CL = 3.3 nF, VGATE =2V /C01797V 50 ns tF* Fall Time VDD =1 2V , CL = 3.3 nF, VGATE =7V /C01792V 30 ns VG_LW* Gate voltage considered as turned off for adaptive dead time control Gate falling 4 V VG_HG* Gate voltage considered as turned on for adaptive dead time control Gate rising 6 V SWITCHING FREQUENCY fMAX* Maximum Switching Frequency 700 kHz fMIN* Minimum Switching Frequency 25 kHz Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. *Not tested but guaranteed by design KEY DIFFERENT PARAMETERS FOR FAN6248 OPTIONS Item FAN6248HC FAN6248HD FAN6248LC FAN6248LD tON_DLY2 850 ns 850 ns 1100 ns 1100 ns tDB_HGH 540 ns 540 ns 1 /C0109s 1 /C0109s tON_MIN_L 200 ns 200 ns 400 ns 400 ns tON_MIN_U 1.2 /C0109s 1.2 /C0109s 4 /C0109s 4 /C0109s tSR_CNDT 0.6 /C0109s 0.6 /C0109s 1.2 /C0109s 1.2 /C0109s tSR_MAX 15 /C0109s 15 /C0109s 30 /C0109s 30 /C0109s tDEAD 280 ns 280 ns 320 ns 320 ns tDEAD_LIGHT 320 ns 320 ns 360 ns 360 ns tGRN_ENT 80 /C0109s 80 /C0109s 160 /C0109s 160 /C0109s tGRN_EXT 40 /C0109s 40 /C0109s 80 /C0109s 80 /C0109s tS_NORMAL 20 /C0109s 20 /C0109s 40 /C0109s 40 /C0109s

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