OB2263NMP

OB2263N Current Mode PWM ControllerFrequency Shuffling Product Specification GENERAL DESCRIPTION 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) Power on Soft start Leading Edge Blanking on Current Sense Input ■ or th ■ Sk yw ■ ■ ■ ■ ■ ■ Improved Gatedrive Design for MOSFET SOA Compliance ■ Good Protection Coverage With Auto SelfRecovery 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. o Overload Protection (OLP) ia lt o ■ APPLICATIONS Offline AC/DC flyback converter for ■ Battery Charger ■ Power Adaptor ■ Set-Top Box Power Supplies ■ Open-frame SMPS C on f id en t OB2263N is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter 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 OB2263N. 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 subharmonic 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. OB2263N 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 OnBright 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. O nB rig ht TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling Part Number OB2263NMP OB2263NAP GENERAL INFORMATION or th Pin Configuration The OB2263N is offered in SOT23-6, DIP8 packages, shown as below. Description SOT23-6, Pb-free in T&R DIP8, Pb-free in Tube Sk yw Package Dissipation Rating Package RθJA(℃/W) DIP8 90 SOT23-6 200 on f id en t ia lt o Absolute Maximum Ratings Parameter Value VDD DC Supply Voltage 30 V VDD Zener Clamp VDD_Clamp+0.1V VoltageNote VDD 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 -40 to 150 ℃ Junction Temperature TJ Min/Max Storage -55 to 150 ℃ Temperature Tstg Lead Temperature 260 oC (Soldering, 10secs) 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. rig ht C Ordering Information OB2263N Package M:SOT23-6 A: DIP8 X Package Pb-free Blank:Normal P:Pb-free O nB Current Mode PWM Controller with Frequency shuffling X ©On-Bright Electronics Confidential -2- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling lt o Sk yw or th Marking Information I RI I SENSE VDD GATE I P O en t FB Description Ground Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and SENSE pin input. Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets the PWM frequency. Current sense input pin. Connected to MOSFET current sensing resistor node. Chip DC power supply pin. Totem-pole gate drive output for the power MOSFET. id I/O P on f Pin Name GND ia TERMINAL ASSIGNMENTS RECOMMENDED OPERATING CONDITION VDD Supply Voltage RI Resistor Value Operating Ambient Temperature Min Max 10 to 30 100 -20 to 85 Unit V Kohm ℃ O nB rig ht VDD RI TA Parameter C Symbol ©On-Bright Electronics Confidential -3- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling O nB rig ht C on f id en t ia lt o Sk yw or th BLOCK DIAGRAM ©On-Bright Electronics Confidential -4- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling ELECTRICAL CHARACTERISTICS Test Conditions VDD Start Current up I_VDD_Ops Operation Current VDD Under Voltage Lockout Enter VDD Under Voltage UVLO(OFF) Lockout Exit (Recovery) VDD Zener Clamp VDD_Clamp Voltage Feedback Input Section(FB Pin) AVCS PWM Input Gain VFB Open Loop VFB_Open Voltage FB pin short circuit IFB_Short current Zero Duty Cycle FB VTH_0D Threshold Voltage Power Limiting FB VTH_PL Threshold Voltage Power limiting TD_PL Debounce Time VDD =12.5V, RI=100K Measure Leakage current into VDD VDD=16V, RI=100Kohm, VFB=3V UVLO(ON) Maximum Duty Cycle Current Sense Input(Sense Pin) Leading edge T_blanking blanking time Over Current Detection and Control Delay Over Current Threshold Voltage at zero Duty Cycle Soft start time ht TD_OC rig VTH_OC O nB T_ss Oscillator FOSC ∆f_Temp ∆f_VDD RI_range V_RI_open Normal Oscillation Frequency Frequency Temperature Stability Frequency Voltage Stability Operating RI Range RI open load voltage ©On-Bright Electronics uA mA IVDD = 5 mA V 13 14 15 V lt o ΔVFB /ΔVcs 9.8 34 V 2.0 V/V 4.8 V 1.2 mA ia Short FB pin to GND and measure current VDD = 16V, RI=100Kohm 0.75 V 3.7 V 35 mSec 6 Koh m VDD=18V, RI=100Kohm, FB=3V, CS=0 75 % RI = 100 Kohm 300 ns 40 Koh m 75 nSec Input Impedance C ZSENSE_IN 20 8.8 on f DC_MAX 3 Unit 7.8 en t Input Impedance Max 1.4 id ZFB_IN Typ Sk yw I_VDD_Startup Min or th (TA = 25℃ if not otherwise noted) Symbol Parameter Supply Voltage (VDD) VDD = 16V, CS>VTH_OC, FB=3.3V FB=3.3V, RI=100 Kohm 0.70 0.75 0.80 3.6 RI = 100 Kohm 60 65 V ms 70 KHZ VDD = 16V, RI=100Kohm, TA -20℃ to 100 ℃ 5 % VDD = RI=100Kohm 5 % 12-25V, 50 100 2 Confidential -5- 150 Koh m V Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling RI VDD = 16V, Io = -20 mA VDD = 16V, Io = 20 mA = 22 KHZ 0.8 10 18 VDD = 16V, CL = 1nf VDD = 16V, CL = 1nf V V or th 16V, V 220 70 nSec nSec RI=100K -3 RI=100K 3 64 % HZ O nB rig ht C on f id en t ia lt o Gate Drive Output VOL Output Low Level VOH Output High Level Output Clamp V_Clamp Voltage Level T_r Output Rising Time T_f Output Falling Time Frequency Shuffling Frequency ∆f_OSC Modulation range /Base frequency Shuffling f_shuffling Frequency VDD = 100Kohm Sk yw Burst Mode Base Frequency Fosc_BM ©On-Bright Electronics Confidential -6- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling CHARACTERIZATION PLOTS 20 9.4 9.0 8.6 8.2 7.8 7.4 7.0 6.6 6.2 5.8 5.4 5.0 4.6 4.2 3.8 3.4 3.0 15 10 5 0 2 4 6 8 10 12 14 16 VDD(V) -20 70 100 130 VDD Operation Current vs. Load(pF) 50KHz 5 4 3 2 1 0 65KHz 100KHz I(V D D ) (m A ) ia 1.6 lt 2 1.2 0.8 0.4 0 5 10 15 VDD (V) 20 25 0 30 id 0 en t I(VD D) (mA) 40 Temp(℃) VDD UVLO and Ops Current C 8.6 8.4 ht 8.2 8.0 10 40 2000 14.4 14.3 14.2 14.1 14.0 70 100 130 -20 Temp(℃) 10 40 70 100 130 Temp(℃) O nB rig -20 1500 14.5 UVLO(OFF) (V) 8.8 1000 UVLO(OFF) vs Temp on f 9.0 500 Gate Load (pF) UVLO(ON) vs Temp UVLO(ON) (V) 10 o 0 Sk yw I_VDD_startup vs. Temp I_vdd_startup (uA) Ivdd_startup(uA ) VDD Startup Current vs. Voltage or th VDD = 16V, RI = 100 Kohm, TA = 25℃ condition applies if not otherwise noted. ©On-Bright Electronics Confidential -7- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling Fosc vs. Temp Fosc(KHz) vs. RI(Kohm) 66.5 66 90 65 65.5 or th 115 Fosc (KHz) 65 64.5 64 40 50 70 90 110 RI(Kohm) 130 63.5 150 -20 5 55 80 Temp (C) 105 130 o 0.95 0.9 0.85 0.8 0.75 0.7 30 lt V th_OC Vth_OC VS Duty Sk yw Fosc(K H z) 140 O nB rig ht C on f id en t ia 0% 10% 20% 30% 40% 50% 60% 70% Duty ©On-Bright Electronics Confidential -8- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling OPERATION DESCRIPTION The ON2263N 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. or th leads to the reduction on the power loss and thus conserves the energy. OB2263N 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. ia lt o • Oscillator Operation A 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. en t • Operating Current The Operating current of OB2263N is low at 1.4mA. Good efficiency is achieved with OB2263N low operating current together with extended burst mode control features. Sk yw • Startup Current and Start up Control Startup current of OB2263N 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. • FOSC = id Soft Start OB2263N features an internal soft start to minimize the component electrical over-stress during power on startup. As soon as VDD reaches UVLO (OFF), the control algorithm will ramp peak current voltage threshold gradually from nearly zero to normal setting. Every restart is a soft start. • on f Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2263N 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. C • rig ht Frequency shuffling for EMI improvement The frequency Shuffling/jittering (switching frequency modulation) is implemented in OB2263N. 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. • O nB 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 subharmonic oscillation and thus reduces the output ripple voltage. • Extended Burst Mode Operation At 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 ©On-Bright Electronics 6500 ( Khz ) RI ( Kohm) • Gate Drive OB2263N Gate is connected to an external MOSFET gate for power switch control. Too weak Confidential -9- Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling or th O nB rig ht C on f id en t ia lt o • Protection Controls Good 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. Sk yw 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. ©On-Bright Electronics Confidential - 10 - Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling Dimensions In Millimeters Min Max 1.000 1.450 0.000 0.150 0.900 1.300 0.300 0.500 0.080 0.220 2.800 3.020 1.500 1.726 2.600 3.000 0.950 (BSC) 1.800 2.000 0.300 0.600 0º 8º ht Symbol C on f id en t ia lt o Sk yw or th PACKAGE MECHANICAL DATA O nB rig A A1 A2 b c D E E1 e e1 L θ ©On-Bright Electronics Confidential - 11 - Dimensions In Inches Min Max 0.039 0.057 0.000 0.006 0.035 0.051 0.012 0.020 0.003 0.009 0.110 0.119 0.059 0.068 0.102 0.118 0.037 (BSC) 0.071 0.079 0.012 0.024 0º 8º Datasheet OB_DOC_DS_2263NA1 OB2263N on f id en t ia lt o Sk yw or th Current Mode PWM ControllerFrequency Shuffling Dimensions In Inches Min Max 0.146 0.210 0.015 0.125 0.142 0.014 0.026 0.06 (BSC) 0.008 0.014 0.354 0.400 0.244 0.260 0.288 0.312 0.1 (BSC) 0.115 0.150 0.323 0.375 O nB rig ht A A1 A2 B B1 C D E E1 e L E2 Dimensions In Millimeters Min Max 3.710 5.334 0.381 3.175 3.600 0.350 0.650 1.524 (BSC) 0.200 0.360 9.000 10.160 6.200 6.600 7.320 7.920 2.540 (BSC) 2.921 3.810 8.200 9.525 C Symbol ©On-Bright Electronics Confidential - 12 - Datasheet OB_DOC_DS_2263NA1 OB2263N Current Mode PWM ControllerFrequency Shuffling IMPORTANT NOTICE or th RIGHT TO MAKE CHANGES On-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. Sk yw WARRANTY INFORMATION On-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. ia lt o LIFE SUPPORT On-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. O nB rig ht C on f id en t MILITARY On-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. ©On-Bright Electronics Confidential - 13 - Datasheet OB_DOC_DS_2263NA1