OB2269_datasheet

GENERAL DESCRIPTIONOB2263 is a highly integrated current mode PWMcontrol IC optimized for high performance, low standby power and cost effective offline flybackconverter applications in sub 30W range.PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss.Lower standby power and higher conversion efficiency is thus achieved. VDD low startup current and low operating current contribute to a reliable power on startup design with OB2263. A large value resistor could thus be used in the startup circuit to minimize the standby power.The internal slope compensation improves system large signal stability and reduces the possible sub-harmonic oscillation at high PWM duty cycle output.Leading-edge blanking on current sense(CS) inputremoves the signal glitch due to snubber circuit diodereverse recovery and thus greatly reduces the externalcomponent count and system cost in the design.OB2263 offers complete protection coverage withautomatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection(OLP), VDD over voltage clamp and under voltagelockout (UVLO). The Gate-drive output is clamped to maximum 18V to protect the power MOSFET. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output. Tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2263 is offered in SOT23-6, SOP-8 and DIP-8 packages.FEATURES ■ On-Bright Proprietary Frequency Shuffling Technology for Improved EMI Performance.■ Extended Burst Mode Control For ImprovedEfficiency and Minimum Standby Power Design ■ Audio Noise Free Operation ■ External Programmable PWM Switching Frequency■ Internal Synchronized Slope Compensation■ Low VDD Startup Current and Low OperatingCurrent (1.4mA) ■ Leading Edge Blanking on Current Sense Input■ Good Protection Coverage With Auto Self-Recovery o VDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO) o Gate Output Maximum Voltage Clamp (18V) o On-Bright Proprietary Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting Over Universal Input Voltage Range. oOverload Protection (OLP) APPLICATIONS Offline AC/DC flyback converter for■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies■ Open-frame SMPSTYPICAL APPLICATIONGENERAL INFORMATIONPin ConfigurationThe OB2263 is offered in SOT23-6, DIP8 and SOP8 packages, shown as below.Ordering Information Part Number DescriptionOB2263MP SOT23-6, Pb-free OB2263AP DIP8, Pb-free OB2263CP SOP8, Pb-freePackage Dissipation RatingPackageR θJA (°C/W)DIP8 90SOP8 150SOT23-6200Absolute Maximum RatingsParameter Value VDD DC Supply Voltage 30 VVDD Zener Clamp VoltageNoteVDD_Clamp+0.1VVDD DC Clamp Current 10 mA FB Input Voltage -0.3 to 7V Sense Input Voltage -0.3 to 7V RI Input Voltage -0.3 to 7V Min/Max Operating Junction Temperature T J -20 to 150 o C Min/Max Storage Temperature T stg-55 to 160 o C Note: VDD_Clamp has a nominal value of 34V.Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.Marking InformationTERMINAL ASSIGNMENTSPin Name I/O DescriptionGroundGND PFB I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and SENSE pin input.RI I Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets the PWM frequency.SENSE I Current sense input pin. Connected to MOSFET current sensing resistor node.VDD P Chip DC power supply pin.GATE O Totem-pole gate drive output for the power MOSFET.RECOMMENDED OPERATING CONDITIONUnit Symbol Parameter MinMaxVDD VDD Supply Voltage 10 to 30 VRI RI Resistor Value 100 KohmT A Operating Ambient Temperature -20 to 85 o CBLOCK DIAGRAMELECTRICAL CHARACTERISTICS(T A = 25O C if not otherwise noted)Symbol Parameter Test Conditions Min Typ Max Unit Supply Voltage (VDD) I_VDD_Startup VDD Start up Current VDD =12.5V, RI=100K Measure Leakage currentinto VDD3 20 uAI_VDD_Ops Operation Current VDD =16V, RI=100Kohm, V FB =3V1.4 mAUVLO(ON) VDD Under Voltage Lockout Enter7.8 8.8 9.8 VUVLO(OFF) VDD Under Voltage Lockout Exit (Recovery)13 14 15 VVDD_Clamp VDD Zener Clamp VoltageI VDD = 5 mA 34 VFeedback Input Section(FB Pin)A VCS PWM Input Gain ΔV FB /ΔV cs2.0 V/V V FB_Open V FB Open Loop Voltage4.8 VI FB _Short FB pin short circuit current Short FB pin to GND and measure current1.2 mAV TH _0D Zero Duty Cycle FB Threshold Voltage VDD = 16V, RI=100Kohm0.75 VV TH _PL Power Limiting FB Threshold Voltage3.7 VT D _PL Power limiting Debounce Time35 mSecZ FB _IN Input Impedance 6 Kohm DC_MAX Maximum Duty Cycle VDD=18V, RI=100Kohm, FB=3V,CS=075 %Current Sense Input(Sense Pin) T_blanking Leading edge blanking timeRI = 100 Kohm 300 nsZ SENSE _IN Input Impedance 40 Kohm T D _OC Over Current Detection and Control DelayVDD = 16V, CS>V TH _OC, FB=3.3V 75 nSecV TH _OC Over Current Threshold Voltage at zero Duty CycleFB=3.3V, RI=100 Kohm 0.70 0.75 0.80 VOscillator F OSC Normal Oscillation FrequencyRI = 100 Kohm 60 65 70 KHZ∆f_TempFrequency Temperature Stability VDD = 16V, RI=100Kohm, T A -20oCto 100 o C5 % ∆f_VDDFrequency Voltage Stability VDD = 12-25V, RI=100Kohm5 % RI_range Operating RI Range 50 100 150 Kohm V_RI_open RI open load voltage 2 V F osc _BM Burst Mode Base VDD = 16V, RI = 22 KHZFrequency 100KohmGate Drive Output VOL Output Low Level VDD = 16V, Io = -20 mA 0.8 V VOH Output High Level VDD = 16V, Io = 20 mA 10 V V_Clamp Output Clamp Voltage Level18 VT_r Output Rising Time VDD = 16V, CL = 1nf 220 nSec T_f Output Falling Time VDD = 16V, CL = 1nf 70 nSec Frequency Shuffling∆f_OSCFrequency Modulation range /Base frequencyRI =100K -3 3 % f_shuffling Shuffling Frequency RI=100K 64 HZCHARACTERIZATION PLOTSUVLO(ON) vs Temp8.08.28.48.68.89.0-20104070100130Temp(C)U V L O (O N ) (V )OPERATION DESCRIPTIONThe OB2263 is a highly integrated PWM controller IC optimized for offline flyback converter applications in sub 30W power range. The extended burst mode control greatly reduces the standby power consumption and helps the design easily meet the international power conservation requirements.•Startup Current and Start up Control Startup current of OB2263 is designed to be very low so that VDD could be charged up above UVLO threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet provides reliable startup in application. For AC/DC adaptor with universal input range design, a 2 MΩ, 1/8 W startup resistor could be used together with a VDD capacitor to provide a fast startup and low power dissipation solution.•Operating CurrentThe Operating current of OB2263 is low at 1.4mA. Good efficiency is achieved with OB2263 low operating current together with extended burst mode control features.•Frequency shuffling for EMI improvement The frequency Shuffling/jittering (switching frequency modulation) is implemented in OB2263. The oscillation frequency is modulated with a random source so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore reduces system design challenge.•Extended Burst Mode OperationAt zero load or light load condition, majority of the power dissipation in a switching mode power supply is from switching loss on the MOSFET transistor, the core loss of the transformer and the loss on the snubber circuit. The magnitude of power loss is in proportion to the number of switching events within a fixed period of time. Reducing switching events leads to the reduction on the power loss and thus conserves the energy.OB2263 self adjusts the switching mode according to the loading condition. At from no load to light/medium load condition, the FB input drops below burst mode threshold level. Device enters Burst Mode control. The Gate drive output switches only when VDD voltage drops below a preset level and FB input is active to output an on state. Otherwise the gate drive remains at off state to minimize the switching loss and reduces the standby power consumption to the greatest extend. The frequency control also eliminates the audio noise at any loading conditions.•Oscillator OperationA resistor connected between RI and GND sets the constant current source to charge/discharge the internal cap and thus the PWM oscillator frequency is determined. The relationship between RI and switching frequency follows the below equation within the specified RI in Kohm range at nominal loading operational condition.)()(6500KhzKohmRIFOSC=•Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2263 current mode PWM control. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sense voltage spike at initial MOSFET on state due to Snubber diode reverse recovery so that the external RC filtering on sense input is no longer required. The current limit comparator is disabled and thus cannot turn off the external MOSFET during the blanking period. PWM duty cycle is determined by the current sense input voltage and the FB input voltage.•Internal Synchronized Slope Compensation Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage.•Gate DriveOB2263 Gate is connected to an external MOSFET gate for power switch control. Too weak the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive output compromises the EMI.A good tradeoff is achieved through the built-in totem pole gate design with right output strength and dead time control. The low idle loss and good EMI system design is easier to achieve with this dedicated control scheme. An internal 18V clamp is added for MOSFET gate protection at higher than expected VDD input.•Protection ControlsGood power supply system reliability is achieved with its rich protection features including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP) and over voltage clamp, Under Voltage Lockout on VDD (UVLO).With On-Bright Proprietary technology, the OCP threshold tracks PWM Duty cycles and is line voltage compensated to achieve constant output power limit over the universal input voltage range with recommended reference design. At overload condition when FB input voltage exceeds power limit threshold value for more than TD_PL, control circuit reacts to shut down the output power MOSFET. Device restarts when VDD voltage drops below UVLO limit.VDD is supplied by transformer auxiliary winding output. It is clamped when VDD is higher than threshold value. The power MOSFET is shut down when VDD drops below UVLO limit and device enters power on start-up sequence thereafter.PACKAGE MECHANICAL DATA SOT23-6IMPORTANT NOTICERIGHT TO MAKE CHANGESOn-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.WARRANTY INFORMATIONOn-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.LIFE SUPPORTOn-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications.MILITARYOn-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications.。

GENERAL DESCRIPTIONOB2263 is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flybackconverter applications in sub 30W range.PWM switching frequency at normal operation is externally programmable and trimmed to tight range. At no load or light load condition, the IC operates in extended ‘burst mode’ to minimize switching loss. Lower standby power and higher conversion efficiency is thus achieved. VDD low startup current and low operating current contribute to a reliable power on startup design with OB2263. A large value resistor could thus be used in the startup circuit to minimize the standby power. The internal slope compensation improves system large signal stability and reduces the possible sub-harmonic oscillation at high PWM duty cycle output. Leading-edge blanking on current sense(CS) input removes the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. OB2263 offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD over voltage clamp and under voltage lockout (UVLO). The Gate-drive output is clamped to maximum 18V to protect the power MOSFET. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output. Tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation. OB2263 is offered in SOT23-6, SOP-8 and DIP-8 packages.FEATURES ■ On-Bright Proprietary Frequency Shuffling Technology for Improved EMI Performance.■ Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design ■ Audio Noise Free Operation ■ External Programmable PWM Switching Frequency■ Internal Synchronized Slope Compensation■ Low VDD Startup Current and Low Operating Current (1.4mA)■ Leading Edge Blanking on Current Sense Input ■ Good Protection Coverage With Auto Self-Recovery oVDD Over Voltage Clamp and Under Voltage Lockout with Hysteresis (UVLO) o Gate Output Maximum Voltage Clamp (18V) o On-Bright Proprietary Line Input Compensated Cycle-by-Cycle Over-current Threshold Setting For Constant Output Power Limiting OverUniversal Input Voltage Range. o Overload Protection (OLP) APPLICATIONS Offline AC/DC flyback converter for■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies■ Open-frame SMPSTYPICAL APPLICATIONGENERAL INFORMATIONPin ConfigurationThe OB2263 is offered in SOT23-6, DIP8 and SOP8 packages, shown as below.Ordering Information Part Number DescriptionOB2263MP SOT23-6, Pb-free OB2263AP DIP8, Pb-free OB2263CP SOP8, Pb-freePackage Dissipation RatingPackageR θJA (°C/W)DIP8 90 SOP8 150SOT23-6200Absolute Maximum RatingsParameter Value VDD DC Supply Voltage30 V VDD Zener Clamp VoltageNoteVDD_Clamp+0.1VVDD DC Clamp Current 10 mA V FB Input Voltage -0.3 to 7V V SENSE Input Voltage to Sense Pin-0.3 to 7V V RI Input Voltage to RI Pin -0.3 to 7V Min/Max Operating Junction Temperature T J -20 to 150 o C Min/Max Storage Temperature T stg-55 to 160 o C Note: VDD_Clamp has a nominal value of 34V.Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.Marking InformationTERMINAL ASSIGNMENTSPin Name I/O DescriptionGND PGroundFB I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and SENSE pin input.RI I Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets the PWM frequency.SENSE I Current sense input pin. Connected to MOSFET current sensing resistor node.VDD P Chip DC power supply pin.GATE O Totem-pole gate drive output for the power MOSFET.RECOMMENDED OPERATING CONDITIONSymbol Parameter MinMaxUnitVDD VDD Supply Voltage 10 to 30 VRI RI Resistor Value 100 KohmT A Operating Ambient Temperature -20 to 85 o CBLOCK DIAGRAMELECTRICAL CHARACTERISTICS(T A = 25O C if not otherwise noted)Symbol Parameter Test Conditions Min Typ Max Unit Supply Voltage (VDD) I_VDD_Startup VDD Start up Current VDD =12.5V, RI=100K Measure Leakage currentinto VDD3 20 uAI_VDD_Ops Operation Current VDD =16V,RI=100Kohm, V FB =3V1.4 mA UVLO(ON) VDD Under Voltage Lockout Enter7.8 8.8 9.8 VUVLO(OFF) VDD Under Voltage Lockout Exit (Recovery)13 14 15 VVDD_Clamp VDD Zener Clamp VoltageI VDD = 5 mA 34 VFeedback Input Section(FB Pin)A VCS PWM Input Gain ΔV FB /ΔV cs2.0 V/V V FB_Open V FB Open Loop Voltage4.8 VI FB _Short FB pin short circuit current Short FB pin to GND and measure current1.2 mAV TH _0D Zero Duty Cycle FB Threshold Voltage VDD = 16V, RI=100Kohm0.75 VV TH _PL Power Limiting FB Threshold Voltage3.7 VT D _PL Power limiting Debounce Time35 mSecZ FB _IN Input Impedance 6 Kohm DC_MAX Maximum Duty Cycle VDD=18V, RI=100Kohm, FB=3V,CS=075 %Current Sense Input(Sense Pin) T_blanking Leading edge blanking timeRI = 100 Kohm 300 nsZ SENSE _IN Input Impedance 40 Kohm T D _OC Over Current Detection andControl DelayVDD = 16V, CS>V TH _OC, FB=3.3V 75 nSecV TH _OC Over CurrentThreshold Voltage at zero Duty CycleFB=3.3V, RI=100 Kohm 0.70 0.75 0.80 V Oscillator F OSC Normal Oscillation FrequencyRI = 100 Kohm 60 65 70 KHZ∆f_TempFrequency Temperature Stability VDD = 16V, RI=100Kohm, T A -20oCto 100 o C5 % ∆f_VDDFrequency Voltage Stability VDD = 12-25V, RI=100Kohm5 % RI_range Operating RI Range 50 100 150 Kohm V_RI_open RI open load voltage 2 VF osc_BM Burst Mode BaseFrequency VDD = 16V, RI =100Kohm22 KHZGate Drive OutputVOL Output Low Level VDD = 16V, Io = -20 mA0.8 V VOH Output High Level VDD = 16V, Io = 20 mA 10 VV_Clamp OutputClampVoltage Level 18VT_r Output Rising Time VDD = 16V, CL = 1nf 220 nSec T_f Output Falling Time VDD = 16V, CL = 1nf 70 nSec Frequency Shuffling∆f_OSC FrequencyModulation range/Base frequencyRI=100K -33%f_shuffling Shuffling Frequency RI=100K 64 HZUVLO(ON) vs Temp8.08.28.48.68.89.0-20104070100130Temp(C)U V L O (O N ) (V )OPERATION DESCRIPTIONThe OB2263 is a highly integrated PWM controller IC optimized for offline flyback converter applications in sub 30W power range. The extended burst mode control greatly reduces the standby power consumption and helps the design easily meet the international power conservation requirements.•Startup Current and Start up Control Startup current of OB2263 is designed to be very low so that VDD could be charged up above UVLO threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet provides reliable startup in application. For AC/DC adaptor with universal input range design, a 2 MΩ, 1/8 W startup resistor could be used together with a VDD capacitor to provide a fast startup and low power dissipation solution.•Operating CurrentThe Operating current of OB2263 is low at 1.4mA. Good efficiency is achieved with OB2263 low operating current together with extended burst mode control features.•Frequency shuffling for EMI improvement The frequency Shuffling/jittering (switching frequency modulation) is implemented in OB2263. The oscillation frequency is modulated with a random source so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore reduces system design challenge.•Extended Burst Mode OperationAt zero load or light load condition, majority of the power dissipation in a switching mode power supply is from switching loss on the MOSFET transistor, the core loss of the transformer and the loss on the snubber circuit. The magnitude of power loss is in proportion to the number of switching events within a fixed period of time. Reducing switching events leads to the reduction on the power loss and thus conserves the energy.OB2263 self adjusts the switching mode according to the loading condition. At from no load to light/medium load condition, the FB input drops below burst mode threshold level. Device enters Burst Mode control. The Gate drive output switches only when VDD voltage drops below a preset level and FB input is active to output an on state. Otherwise the gate drive remains at off state to minimize the switching loss and reduces the standby power consumption to the greatest extend. The frequency control also eliminates the audio noise at any loading conditions.•Oscillator OperationA resistor connected between RI and GND sets the constant current source to charge/discharge the internal cap and thus the PWM oscillator frequency is determined. The relationship between RI and switching frequency follows the below equation within the specified RI in Kohm range at nominal loading operational condition.)()(6500KhzKohmRIFOSC=•Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2263 current mode PWM control. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sense voltage spike at initial MOSFET on state due to Snubber diode reverse recovery so that the external RC filtering on sense input is no longer required. The current limit comparator is disabled and thus cannot turn off the external MOSFET during the blanking period. PWM duty cycle is determined by the current sense input voltage and the FB input voltage.•Internal Synchronized Slope Compensation Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage.•Gate DriveOB2263 Gate is connected to an external MOSFET gate for power switch control. Too weak the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive output compromises the EMI.A good tradeoff is achieved through the built-in totem pole gate design with right output strength and dead time control. The low idle loss and good EMI system design is easier to achieve with this dedicated control scheme. An internal 18V clamp is added for MOSFET gate protection at higher than expected VDD input.Current Mode PWM Controllerm kw k c om• Protection ControlsGood power supply system reliability is achieved with its rich protection features including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP) and over voltage clamp, Under Voltage Lockout on VDD (UVLO).With On-Bright Proprietary technology, the OCP threshold tracks PWM Duty cycles and is line voltage compensated to achieve constant output power limit over the universal input voltage range with recommended reference design.At overload condition when FB input voltage exceeds power limit threshold value for more than TD_PL, control circuit reacts to shut down the output power MOSFET. Device restarts when VDD voltage drops below UVLO limit.VDD is supplied by transformer auxiliary winding output. It is clamped when VDD is higher than threshold value. The power MOSFET is shut down when VDD drops below UVLO limit and device enters power on start-up sequence thereafter.PACKAGE MECHANICAL DATASOT23-68-Pin Plastic DIP8-Pin Plastic SOPIMPORTANT NOTICERIGHT TO MAKE CHANGESOn-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.WARRANTY INFORMATIONOn-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.LIFE SUPPORTOn-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications.MILITARYOn-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications.。

GENERAL DESCRIPTIONOB6663L integrates a transition mode power factor correction (TM PFC) controller and a Quasi-Resonant (QR) controller in one chip. The controller provides a cost effective solution for optimizing the power factor of LED lighting application power supply. QR provides higher efficiency and lower EMI compared to conventional PWM system. OB6663L provides high level integration and high performance than conventional PFC/PWM system. The built-in dual output control for TM PFC optimizes power conversion efficiency with reduced system cost. Separate analog ground (AGND) and power ground (PGND) provide better noise immunity. OB6663L features many built-in green functions to optimize power conversion efficiency at all power levels. This holds for QR operation at high power levels, as well as PFM operation at lower powerlevels, and ‘Extended Burst Mode’ operation at very low power or zero power (Standby) levels. At low power levels, OB6663L automatically turns off the PFC stage. In this way, low standby (<0.2W) together with low system cost can be achieved. OB6663L offers comprehensive protection coverage including VCC Under Voltage Lockout (UVLO), Cycle-by-Cycle Current Limiting for PFC and QR Stage (OCP), Output Over Voltage Protection for PFC and QR Stage (OVP), Open Loop Protection for PFC and QR Stage (OLP), Programmable Brownout Protection (BOP), Programmable Over Temperature Protection (OTP), Built-in Soft Start in QR Stage, VCC Zener Clamp, Gate Clamp, Pin Floating Protection, and External Latch Triggering, etc. OB6663L is offered in SOP-16 packages.FEATURES■ Integrated Transition Mode (TM) PFC Controller and Quasi-Resonant (QR) PWMController■ Built-in Dual Output PFC Control ■ Multi-Mode Operation for QR Stage■ Separate AGND and PGND Provide Better Noise Immunity ■ Analog Multiplier with Built-in THD Optimizer for PFC Stage■ Line Feed-forward Compensation for PFC Stage■ Enhanced Dynamic Response for PFC Stage ■ Less than 200mW Standby Power Consumption ■ Minimum QR Short Circuit Power Consumption ■ Audio Noise Free Operation PROTECTIONS ■ Precise Output Over Voltage Protection (OVP) for Both Converters ■ Open Loop Protection (OLP) for Both Converters■ Cycle-by-Cycle Current Limiting for Both Converters ■ 125KHz Max Frequency Clamping for QR Converter, and 240Khz for PFC converter ■ Programmable Brownout Protection (BOP)■ External Programmable Over Temperature Protection (OTP)■ External Latch Triggering for Both Converters ■ Minimum OFF time for Ringing Suppression ■ Maximum ON Time Limit for QR Converter ■ Built-in 4ms Soft Start for QR Converter ■ Internal Leading Edge Blanking for Both Converters ■ All Pin Floating Protection■ 1A Gate Drive Capability APPLICATIONSOffline AC/DC flyback converter for■ Power Adaptor and Open-frame SMPS ■ LCD Monitor/TV/PC ■ NotebookOn -B ri gh tCo n f i de n ti al to 合明光电TYPICAL APPLICATIONnoGENERAL INFORMATIONOrdering Information Part Number OB6663LQP 16 Pin SOP, Pb free in Tube OB6663LQPA 16 Pin SOP, Pb free in T&R Note: All Devices are offered in Pb-free Package if nototherwise noted.n -B ri n f i de nMarking InformationDescriptionIZero current detection input. When activated, a new PFC switchingcycle starts.I/O Input of multiplier. Connected to line voltage after bridge diodes via aresistor divider to provide sinusoidal reference voltage to the PFCcurrent loop. This pin is also used for brownout detection.3 INV IInverting input of the error amplifier (EA). The information at the outputof the PFC stage is fed to the pin through a resistor divider.I/O Output of EA. A compensation network is placed between COMP andAGND to achieve stability of the voltage control loop and ensure highpower factor and low THD.This pin is connected to AGND via a 20K Ohm resistor. Chip analog ground.I/OQR stage feedback input from the opto-coupler. The voltage of this pin controls the mode of QR operation in one of the three modes: Quasi-Resonant (QR), Pulse Frequency Modulation (PFM), and Burst Mode (BM).QR stage current sense input pin.I/OThis pin is connected to ground via a NTC resistor, external overtemperature protection.11 DEM IInput from QR auxiliary winding for demagnetization timing. This pin isalso used for QR over voltage protection.Chip power supply pin. QR stage totem pole gate driver output. PFC stage totem pole gate driver output. Chip power ground pin for PFC and QR gate driver PFC current sense input.RECOMMENDED OPERATING CONDITIONVCC Supply VoltageCo n f i de n ti aELECTRICAL CHARACTERISTICScurrent under normal operationTr_pfc PFC_OUT rising time Tf_pfc PFC_OUT falling timeQR Over Load Protection (QR OLP)Power Limiting FBPackage Mechanical Data:Dimensions In Millimeters Dimensions In Inches SymbolMin Max Min Max A1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 B ri gh t Co n f i de n ti al to 合明光电。

GENERAL DESCRIPTIONBriard combines a dedicated current mode PWM controller. It is optimized for high performance, low standby power (< 100mW), and cost effective off-line flyback converter applications in 40W~60W range.Briard offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), CS short protection, CS floating protection, over load protection (OLP), and VDD under voltage lockout (UVLO) and latch feature including over temperature protection (OTP), over voltage(fixed or adjustable) protection (OVP). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output.The tone energy at below 20KHZ is minimized in the design and audio noise is eliminated during operation.Briard is offered in SOT23-6 package.APPLICATIONSOffline AC/DC flyback converter for ■ AC/DC adapter■ PDA power supplies■ Digital Cameras and Camcorder Adapter ■ VCR, SVR, STB, DVD&DVCD Player SMPS ■ Set-Top Box Power■ Auxiliary Power Supply for PC and Server ■ Open-frame SMPSFEATURES■Power on Soft Start Reducing MOSFET Vds Stress■ Frequency shuffling for EMI■ Extended Burst Mode Control For ImprovedEfficiency and Minimum Standby Power Design■ Audio Noise Free Operation■ Fixed 65KHZ Switching Frequency■ Internal Synchronized Slope Compensation ■ Leading Edge Blanking on Current SenseInput■ Good Protection Coverage With Auto Self-Recoveryo VDD Under Voltage Lockout with Hysteresis(UVLO)o Over Temperature Protection (OTP) withlatcho Cycle-by-cycle over current thresholdsetting for constant output power limiting over universal input voltage rangeo Overload Protection (OLP) with auto-recoveryo Over voltage Protection(OVP) with latch o Adjustable OVP through external Zener o CS floating protection with auto-recovery o CS short protection with auto-recoveryTYPICAL APPLICATIONProduct Specificationt al Re fe r en c eGENERAL INFORMATIONPin ConfigurationThe OB2273 is offered in SOT23-6 package,shown as below.Ordering Information Part Number Description OB2273MP SOT23-6, Pb-free in T&RPackage Dissipation Rating Package R θJA(℃/W)SOT23-6 200Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 40 V VDD Zener ClampVoltage NoteVDD_Clamp+0.1VVDD DC Clamp Current 10 mA FB Input Voltage -0.3 to 7V Sense Input Voltage -0.3 to 7V RT Input Voltage -0.3 to 7V Min/Max OperatingJunction Temperature TJ -20 to 150 oCMin/Max StorageTemperature Tstg-55 to 160 oCNote:VDD_Clamp has a nominal value of 32V.Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.I nt er n a l Re fe r en c eMarking InformationTERMINAL ASSIGNMENTSFor SOT23-6Pin Name I/O Description GND P GroundFB IFeedback input pin. The PWM duty cycle is determined by voltage level into this pinand the current-sense signal at Pin 3.RT I Dual function pin. Either connected through a NTC resistor to ground for overtemperature shutdown/latch control or connected through Zener to VDD foradjustable over voltage protectionCS I Current sense input VDD P PowerSupply Gate O Totem-pole gate driver output for power MosfetRECOMMENDED OPERATING CONDITIONSymbol ParameterMin/Max Unit VDD VDD Supply Voltage10 to 30 V T AOperating Ambient Temperature-20 to 85℃C: Optional Internal CodeI nt er n al Re fe ren c eBLOCK DIAGRAMI nt e r n al R e fe r en c eELECTRICAL CHARACTERISTICS(T A = 25℃, VDD=16V, unless otherwise noted) Symbol Parameter Test Conditions Min Typ Max UnitSupply Voltage (VDD) IstartupVDD Start up CurrentVDD=11V,MeasureLeakage current into VDD5 20 uA I_VDD_Operation Operation CurrentV FB =3V 1.8 2.5 mA UVLO(ON)VDD Under Voltage LockoutEnter6 7 8 VUVLO(OFF)VDD Under Voltage LockoutExit (Recovery)12.5 13.5 14.5VVpull-up Pull-up PMOS active 13 V Vdd_clampIvdd =10mA 30 32 34 V OVP(ON) Over voltage protectionvoltageCS=0V,FB=3VRamp up VDD until gate clock is off24 26 28 VVlatch_release Latch release voltage 5 V Feedback Input Section(FB Pin)V FB_Open V FB Open Loop Voltage 3.9 4.2 VAvcs PWM input gain ΔVFB/ΔVCS2 V/VMaximum duty cycle Max duty cycle @VDD=14V,VFB=3V,VCS=0V75 80 85 %Vref_green The threshold enter greenmode1.4 VVref_burst_H The threshold exit burstmode0.675 VVref_burst_L The threshold enter burstmode0.575 VI FB _Short FB pin short circuit current Short FB pin to GNDand measure current0.3 mAV TH _PL Power Limiting FBThreshold Voltage3.7 VT D _PL Power limiting DebounceTime80 88 96 mSecZ FB _IN Input Impedance 4 Kohm Current Sense Input(Sense Pin) Soft start time 4 ms T_blanking Leading edge blanking time 220 ns Z SENSE _IN Input Impedance 40 KohmT D _OC Over Current Detection andControl DelayFrom Over CurrentOccurs till the Gatedrive output start to turn off120nSec V TH _OC Internal Current Limiting Threshold Voltage FB=3.3V0.75 VVocp_clamper CS voltage clamper 0.9 V OscillatorF OSC Normal Oscillation Frequency VDD =14V, FB =3V,CS=0V60 65 70 KHZ△f_OSC Frequency jittering +/-4 % F_shuffling Shuffling frequency 32 Hz△f_Temp Frequency TemperatureStability1 %I nt er n al Re fe r en c e△f_VDD Frequency Voltage Stability 1 % F_Burst Burst Mode BaseFrequency22 KHZGate driver VOLOuput low level @VDD=14V, Io=5mA1 VVOH Ouput high level @VDD=14V, Io=20mA6 VV_clamp Output clamp voltage 12 VT_r Output rising time 1V ~ 12V@ CL=1000pF175 nST_f Output falling time 12V ~ 1V@ CL=500pF85 nSOver temperature protection IRT Output current of RT pin 95 100 105uA VOTP Threshold voltage for OTP 0.95 1 1.05V Td_OTP OTP debounce time 32 Cycle VRT_FL Float voltage at RT pin 2.3 VVth_OVP External OVP thresholdvoltage4 VI nt er n al Re fe r en c eCHARACTERIZATION PLOTSVDD = 18V, TA = 25℃ condition applies if not otherwise noted.OPERATION DESCRIPTIONThe Briard is a low power off-line SMPS Switcher optimized for off-line flyback converter applications in 40W~60W power range. The ‘Extended burst mode’ control greatly reduces the standby power consumption and helps the design easily to meet the international power conservation requirements.• Startup Current and Start up ControlStartup current of Briard is designed to be very low so that VDD could be charged up above UVLO threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet achieve a reliable startup in application. For AC/DC adapter with universal input range design, a 2 M Ω, 1/8 W startup resistor could be used together with a VDD capacitor to provide a fast startup and yet low power dissipation design solution.• Operating CurrentThe Operating current of Briard is low at 1.8mA. Good efficiency is achieved with Briard low operating current together with the ‘Extended burst mode’ control features.• Soft StartBriard features an internal 4ms soft start to soften the electrical stress occurring in the power supply during startup. It is activated during the power on sequence. As soon as VDD reaches UVLO(OFF), the CS peak voltage is gradually increased from 0.15V to the maximum level. Every restart up is followed by a soft start.• Frequency shuffling for EMI improvement The frequency Shuffling (switching frequency modulation) is implemented in Briard. The oscillation frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore eases the system design.• Extended Burst Mode OperationAt light load or zero load condition, most of the power dissipation in a switching mode power supply is from switching loss on the MOSFET, the core loss of the transformer and the loss on the snubber circuit. The magnitude of power loss is in proportion to the switching frequency. Lower switching frequency leads to the reduction on the power loss and thus conserves the energy.The switching frequency is internally adjusted at no load or light load condition. The switch frequency reduces at light/no load condition to improve the conversion efficiency. At light load or no load condition, the FB input drops below burst mode threshold level and device enters Burst Mode control. The Gate drive output switches only when VDD voltage drops below a preset level and FB input is active to output an on state. Otherwise the gate drive remains at off state to minimize the switching loss and reduces the standby power consumption to the greatest extend.The switching frequency control also eliminates the audio noise at any loading conditions.• Oscillator OperationThe switching frequency of Briard is internally fixed at 65KHZ. No external frequency setting components are required for PCB design simplification.• Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in Briard current mode PWM control. The switch current is detected by a sense resistor into the sense pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial internal power MOSFET on state due to snubber diode reverse recovery and surge gate current of power MOSFET so that the external RC filtering on sense input is no longer needed. The current limiting comparator is disabled and cannot turn off the internal power MOSFET during the blanking period. The PWM duty cycle is determined by the current sense input voltage and the FB input voltage.• Internal Synchronized Slope Compensation Built-in slope compensation circuit adds voltage ramp onto the current sense input voltage for PWM generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces the output ripple voltage.• DriveThe power MOSFET is driven by a dedicated gate driver for power switch control. Too weak the gate drive strength results in higher conduction and switch loss of MOSFET while too strong gate drive results the compromise of EMI.A good tradeoff is achieved through the built-in totem pole gate design with right output strengthI nt er n al Re fe r en c eand dead time control. The low idle loss and good EMI system design is easier to achieve with this dedicated control scheme. • Protection ControlsGood power supply system reliability is achieved with auto-recovery protection features including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP), CS short protection, CS floating protection, and Under Voltage Lockout on VDD (UVLO), and latch features including over temperature protection (OTP), fixed or adjustable over voltage protection (OVP).With On-Bright Proprietary technology, the OCP is line voltage compensated to achieve constantoutput power limit over the universal input voltage range.At overload condition when FB input voltage exceeds power limit threshold value for more than TD_PL, control circuit reacts to shut down the switcher. Switcher restarts when VDD voltage drops below UVLO limit. For latch mode, control circuit shutdowns (latch) the power MOSFET when an Over Temperature condition or Over Voltage condition is detected until VDD drops below 5V (Latch release voltage) , and device enters power on restart-up sequence thereafter .I nt er n al Re fe r en c ePACKAGE MECHANICAL DATADimensions In Millimeters Dimensions In Inches SymbolMin Max Min MaxA 1.000 1.300 0.039 0.051 A1 0.000 0.150 0.000 0.006 A2 1.000 1.200 0.039 0.047 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.800 3.020 0.110 0.119 E 1.500 1.700 0.059 0.067 E1 2.600 3.000 0.102 0.118 e 0.950 (BSC) 0.037 (BSC)e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 θ 0º 8º 0º 8ºI nt er n al Re fe r en c e©On-Bright Electronics Confidential Preliminary DatasheetOB_DOC_DS_227300- 11 - OB2273 Current Mode PWM Power Switch Frequency ShufflingIMPORTANT NOTICERIGHT TO MAKE CHANGESOn-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.WARRANTY INFORMATIONOn-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed.On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards.LIFE SUPPORTOn-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications.MILITARYOn-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications.I nt e r n a l R e f e r e n c e。