Datasheet No – PD97382 March 6, 2009 IR1168S DUAL SMART RECTIFIER DRIVER IC Product Summary Features • • • • • • • • • • • • • Secondary-side high speed controller for synchronous rectification in resonant half bridge topologies 200V proprietary IC technology Max 500KHz switching frequency Anti-bounce logic and UVLO protection 4A peak turn off drive current Micropower start-up & ultra low quiescent current 10.7V gate drive clamp 70ns turn-off propagation delay Wide Vcc operating range Direct sensing for both Synchronous Rectifiers Minimal component count Simple design Lead-free Topology LLC Half-bridge VD 200V VOUT 10.7V Clamped Io+ & I o- (typical) +1A & -4A Turn on Propagation Delay 60ns (typical) Turn off Propagation Delay 70ns (typical) Package Options Typical Applications • LCD & PDP TV, Telecom SMPS, AC-DC adapters 8-Lead SOIC Typical Connection Diagram Vin SR1 C1 Cdc M1 Rg1 Lr 1 2 1 2 3 4 C2 Rtn www.irf.com M2 GATE1 GATE2 VCC GND VS1 VS2 VD1 VD2 IR1168 IR1168 8 7 6 5 Cout LOAD Rg2 SR2 © 2008 International Rectifier IR1168S Table of Contents Page Description 3 Qualification Information 4 Absolute Maximum Ratings 5 Electrical Characteristics 6 Functional Block Diagram 8 Input/Output Pin Equivalent Circuit Diagram 9 Lead Definitions 10 Lead Assignments 10 Application Information and Additional Details 12 Package Details 16 Tape and Reel Details 17 Part Marking Information 18 Ordering Information 19 www.irf.com © 2008 International Rectifier 2 IR1168S Description IR1168 is dual smart secondary-side rectifier driver IC designed to drive two N-Channel power MOSFETs used as synchronous rectifiers in resonant converter applications. The IC can control one or more paralleled N MOSFETs to emulate the behavior of Schottky diode rectifiers. The drain to source for each rectifier MOSFET voltage is sensed differentially to determine the level of the current and the power switch is turned ON and OFF in close proximity of the zero current transition. Ruggedness and noise immunity are accomplished using an advanced blanking scheme and double-pulse suppression that allows reliable operation in fixed and variable frequency applications. www.irf.com © 2008 International Rectifier 3 IR1168S Qualification Information† Qualification Level Moisture Sensitivity Level Machine Model ESD Human Body Model IC Latch-Up Test RoHS Compliant † †† ††† Industrial†† Comments: This family of ICs has passed JEDEC’s Industrial qualification. IR’s Consumer qualification level is granted by extension of the higher Industrial level. MSL2††† 260°C SOIC8N (per IPC/JEDEC J-STD-020) Class B (per JEDEC standard JESD22-A115) Class 2 (per EIA/JEDEC standard EIA/JESD22-A114) Class I, Level A (per JESD78) Yes Qualification standards can be found at International Rectifier’s web site http://www.irf.com/ Higher qualification ratings may be available should the user have such requirements. Please contact your International Rectifier sales representative for further information. Higher MSL ratings may be available for the specific package types listed here. Please contact your International Rectifier sales representative for further information. www.irf.com © 2008 International Rectifier 4 IR1168S Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltages referenced to COM, all currents are defined positive into any lead. The thermal resistance and power dissipation ratings are measured under board mounted and still air conditions. Parameters Supply Voltage Cont. Drain Sense Voltage Pulse Drain Sense Voltage Source Sense Voltage Gate Voltage Operating Junction Temperature Storage Temperature Thermal Resistance Package Power Dissipation Switching Frequency Symbol VCC VD VD VS VGATE TJ TS RθJA PD fsw Min. -0.3 -3 -5 -3 -0.3 -40 -55 Max. 20 200 200 20 20 150 150 128 970 500 www.irf.com Units V V V V V °C °C °C/W mW kHz Remarks VCC=20V, Gate off SOIC-8 SOIC-8, TAMB=25°C © 2008 International Rectifier 5 IR1168S Electrical Characteristics The electrical characteristics involve the spread of values guaranteed within the specified supply voltage and junction temperature range TJ from – 25° C to 125°C. Typical values represent the median values, which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 15 V is assumed for test condition. Supply Section Parameters Supply Voltage Operating Range VCC Turn On Threshold VCC Turn Off Threshold (Under Voltage Lock Out) VCC Turn On/Off Hysteresis Symbol Min. Typ. Max. Units VCC VCC ON 8.6 7.5 8.1 18 8.5 V V VCC UVLO 7 7.6 8 V 18 60 3.8 140 V mA mA mA µA VCC HYST Operating Current ICC Quiescent Current Start-up Current IQCC ICC START 0.5 14 48 2.6 Comparator Section Parameters Turn-off Threshold Turn-on Threshold Hysteresis Input Bias Current Input Bias Current Comparator Input Offset Symbol VTH1 VTH2 VHYST IIBIAS1 IIBIAS2 VOFFSET Min. -12 -220 One-Shot Section Parameters Blanking pulse duration Symbol tBLANK Reset Threshold Hysteresis Minimum On Time Section Parameters Minimum on time GBD CLOAD =1nF, fSW = 400kHz CLOAD =4.7nF, fSW = 400kHz VCC=VCC ON - 0.1V Typ. -6 -140 141 1 10 Max. 0 -80 Min. 9 Typ. 17 2.5 5.4 40 Max. 25 Units Remarks µs V VCC=10V – GBD V VCC=20V – GBD mV VCC=10V - GBD Min. 500 Typ. 750 Max. 1000 Units ns VTH3 VHYST3 Symbol TONmin Remarks 10 50 2 www.irf.com Units mV mV mV µA VD = -50mV µA VD = 200V mV GBD Remarks Remarks © 2008 International Rectifier 6 IR1168S Electrical Characteristics The electrical characteristics involve the spread of values guaranteed within the specified supply voltage and junction temperature range TJ from – 25° C to 125°C. Typical values represent the median values, which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 15 V is assumed for test condition. Gate Driver Section Parameters Gate Low Voltage Gate High Voltage Rise Time Symbol VGLO VGTH tr1 tr2 Fall Time tf1 tf2 Turn on Propagation Delay tDon Turn off Propagation Delay tDoff Pull up Resistance rup Pull down Resistance rdown Output Peak Current (source) IO source Output Peak Current (sink) IO sink Min. 8.5 Typ. 0.3 10.7 10 80 5 25 60 70 5 1.2 1 4 Max. 0.5 13.5 120 120 www.irf.com Units V V ns ns ns ns ns ns Ω Ω A A Remarks IGATE = 200mA VCC=12V-18V (internally clamped) CLOAD = 1nF CLOAD = 4.7nF CLOAD = 1nF CLOAD = 4.7nF VDS to VGATE -100mV overdrive VDS to VGATE -100mV overdrive IGATE = 15mA - GBD IGATE = -200mA CLOAD = 1nF - GBD CLOAD = 1nF - GBD © 2008 International Rectifier 7 IR1168S Functional Block Diagram www.irf.com © 2008 International Rectifier 8 IR1168S I/O Pin Equivalent Circuit Diagram www.irf.com © 2008 International Rectifier 9 IR1168S Lead Definitions PIN# 1 2 3 4 5 6 7 8 Symbol GATE1 VCC VS1 VD1 VD2 VS2 GND GATE2 Description Gate Drive Output 1 Supply Voltage Sync FET 1 Source Voltage Sense Sync FET 1 Drain Voltage Sense Sync FET 2 Drain Voltage Sense Sync FET 2 Source Voltage Sense Analog and Power Ground Gate Drive Output 2 Lead Assignments 1 GATE1 GATE2 8 2 VCC GND 7 3 VS1 VS2 6 4 VD1 VD2 5 www.irf.com © 2008 International Rectifier 10 IR1168S Detailed Pin Description VCC: Power Supply This is the supply voltage pin of the IC and it is monitored by the under voltage lockout circuit. It is possible to turn off the IC by pulling this pin below the minimum turn off threshold voltage, without damage to the IC. To prevent noise problems, a bypass ceramic capacitor connected to Vcc and COM should be placed as close as possible to the IR1168. This pin is not internally clamped. GND: Ground This is ground potential pin of the integrated control circuit. The internal devices and gate driver are referenced to this point. VD1 and VD2: Drain Voltage Sense These are the two high-voltage pins used to sense the drain voltage of the two SR power MOSFETs. Routing between the drain of the MOSFET and the IC pin must be particularly optimized. VS1 and VS2: Source Voltage Sense These are the two differential sense pins for the two source pins of the two SR power MOSFETs. This pin must not be connected directly to the GND pin (pin 7) but must be used to create a kelvin contact as close as possible to the power MOSFET source pin. GATE1 and GATE2: Gate Drive Outputs These are the two gate drive outputs of the IC. The gate voltage is internally clamped and has a +1A/-4A peak drive capability. Although this pin can be directly connected to the synchronous rectifier (SR) MOSFET gate, the use of gate resistor is recommended (specifically when putting multiple MOSFETs in parallel). Care must be taken in order to keep the gate loop as short and as small as possible in order to achieve optimal switching performance. www.irf.com © 2008 International Rectifier 11 IR1168S Application Information and Additional Details State Diagram POWER ON Gate Inactive UVLO MODE VCC < VCCon Gate Inactive ICC = ICC START VCC > VCCon VCC < VCCuvlo NORMAL Gate Active Gate PW ≥ MOT UVLO Mode: The IC is in the UVLO mode when the VCC pin voltage is below VCCUVLO. The UVLO mode is accessible fro any other state of operation. In the UVLO state, most of the internal circuitry is unbiased and the IC draws quiescent current of ICCSTART. The IC remains in the UVLO condition until the voltage on the VCC pin exceeds the VCC turn on thresh voltage, VCC ON. Normal Mode: The IC enters in normal operating mode once the UVLO voltage has been exceeded. At this point the gate drive are operating and the IC will draw a maximum of ICC from the supply voltage source. www.irf.com © 2008 International Rectifier 12 IR1168S General Description The IR1168 Dual Smart Rectifier controller IC is the industry first dedicated high-voltage controller IC for synchronous rectification in resonant converter applications. The IC can emulate the operation of the two secondary rectifier diodes by correctly driving the synchronous rectifier (SR) MOSFETs in the two secondary legs. The core of this device are two high-voltage, high speed comparators which sense the drain to source voltage of the MOSFETs differentially. The device current is sensed using the RDSON as a shunt resistance and the GATE pin of the MOSFET is driven accordingly. Dedicated internal logic then manages to turn the power device on and off in close proximity of the zero current transition. IR1168 further simplifies synchronous rectifier control by offering the following power management features: -Wide VCC operating range allows the IC to be directly powered from the converter output -Shoot through protection logic that prevents both the GATE outputs from the IC to be high at the same time -Device turn ON and OFF in close proximity of the zero current transition with low turn-on and turn-off propagation delays; eliminates reactive power flow between the output capacitors and power transformer -Internally clamped gate driver outputs that significantly reduce gate losses. The SmartRectifier™ control technique is based on sensing the voltage across the MOSFET and comparing it with two negative thresholds to determine the turn on and off transitions for the device. The rectifier current is sensed by the input comparators using the power MOSFET RDSON as a shunt resistance and its GATE is driven depending on the level of the sensed voltage vs. the 3 thresholds shown below. VGate VDS VTH2 VTH1 VTH3 Figure 1: Input comparator thresholds Turn-on phase When the conduction phase of the SR FET is initiated, current will start flowing through its body diode, generating a negative VDS voltage across it. The body diode has generally a much higher voltage drop than the one caused by the MOSFET on resistance and therefore will trigger the turn-on threshold VTH2. When VTH2 is triggered, IR1168 will drive the gate of MOSFET on which will in turn cause the conduction voltage VDS to drop down to ID*RDSON. This drop is usually accompanied by some amount of ringing, that could trigger the input comparator to turn off; hence, a fixed Minimum On Time (MOT) blanking period is used that will maintain the power MOSFET on for a minimum amount of time. The fixed MOT limits the minimum conduction time of the secondary rectifiers and hence, the maximum switching frequency of the converter. Turn-off phase Once the SR MOSFET has been turned on, it will remain on until the rectified current will decay to the level where VDS will cross the turn-off threshold VTH1. www.irf.com © 2008 International Rectifier 13 IR1168S Since the device currents are sinusoidal here, the device VDS will cross the VTH1 threshold with a relatively low dV/dt. Once the threshold is crossed, the current will start flowing again through the body diode, causing the VDS voltage to jump negative. Depending on the amount of residual current, VDS may once again trigger the turn-on threshold; hence, VTH2 is blanked for a time duration tBLANK after VTH1 is triggered. When the device VDS crosses the positive reset threshold VTH3, tBLANK is terminated and the IC is ready for next conduction cycle as shown below. VTH3 IDS VDS T1 T2 VTH1 VTH2 Gate Drive Blanking MOT tBLANK time Figure 2: Secondary currents and voltages www.irf.com © 2008 International Rectifier 14 IR1168S VCC VCC ON VCC UVLO t UVLO NORMAL UVLO Vcc UVLO VTH1 VDS VTH2 t Don t Doff VGate 90% 50% 10% t rise tfall Timing waveform www.irf.com © 2008 International Rectifier 15 IR1168S Package Details: SOIC8N www.irf.com © 2008 International Rectifier 16 IR1168S Tape and Reel Details: SOIC8N LOADED TAPE FEED DIRECTION A B H D F C NOTE : CONTROLLING DIM ENSION IN M M E G CARRIER TAPE DIMENSION FOR Metric Code Min Max A 7.90 8.10 B 3.90 4.10 C 11.70 12.30 D 5.45 5.55 E 6.30 6.50 F 5.10 5.30 G 1.50 n/a H 1.50 1.60 8SOICN Imperial Min Max 0.311 0.318 0.153 0.161 0.46 0.484 0.214 0.218 0.248 0.255 0.200 0.208 0.059 n/a 0.059 0.062 F D C B A E G H REEL DIMENSIONS FOR 8SOICN Metric Code Min Max A 329.60 330.25 B 20.95 21.45 C 12.80 13.20 D 1.95 2.45 E 98.00 102.00 F n/a 18.40 G 14.50 17.10 H 12.40 14.40 Imperial Min Max 12.976 13.001 0.824 0.844 0.503 0.519 0.767 0.096 3.858 4.015 n/a 0.724 0.570 0.673 0.488 0.566 www.irf.com © 2008 International Rectifier 17 IR1168S Part Marking Information www.irf.com © 2008 International Rectifier 18 IR1168S Ordering Information Standard Pack Base Part Number IR1168 Package Type SOIC8N Complete Part Number Form Quantity Tube/Bulk 95 IR1168SPBF Tape and Reel 2500 IR1168STRPBF The information provided in this document is believed to be accurate and reliable. However, International Rectifier assumes no responsibility for the consequences of the use of this information. International Rectifier assumes no responsibility for any infringement of patents or of other rights of third parties which may result from the use of this information. No license is granted by implication or otherwise under any patent or patent rights of International Rectifier. The specifications mentioned in this document are subject to change without notice. This document supersedes and replaces all information previously supplied. For technical support, please contact IR’s Technical Assistance Center http://www.irf.com/technical-info/ WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 www.irf.com © 2008 International Rectifier 19