OB2269PCPA

OB2269P Current Mode PWM Controller Frequency Shuffling OB2269P is offered in both SOP-8 and DIP-8 packages. GENERAL DESCRIPTION OB2269P is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. 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 OB2269P. 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 input removes the signal glitch due to snubber circuit diode reverse recovery. This greatly helps to reduce the external component count and system cost in application. OB2269P offers complete protection coverage with automatic self-recovery feature including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), over temperature protection (OTP), VDD over voltage protection (OVP) and under voltage lockout (UVLO). The Gate-drive output is clamped at 18V to protect the power MOSFET. In OB2269P, OCP threshold slope is internally optimized to reach constant output power limit over universal AC input range. Excellent EMI performance is achieved with OnBright 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 operation. Consequently, audio noise performance is greatly improved. 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 VIN/VDD Startup Current and Low Operating Current ■ Power on Soft start ■ Leading Edge Blanking on Current Sense Input ■ Complete Protection Coverage With Auto Self-Recovery o External Programmable Over Temperature Protection (OTP) o With On-chip VDD OVP for System OVP o Under Voltage Lockout with Hysteresis (UVLO) o Gate Output Maximum Voltage Clamp (18V) o Line Compensated Cycle-by-Cycle Overcurrent Threshold Setting For Constant Output Current Limiting Over Universal Input Voltage Range (OCP) o Over Load Protection. (OLP) on f id en t ia lt o 龙 圣 ■ C APPLICATIONS nB rig ht Offline AC/DC flyback converter for ■ Laptop Power Adaptor ■ PC/TV/Set-Top Box Power Supplies ■ Open-frame SMPS ■ Battery Charger O TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling GENERAL INFORMATION Package Dissipation Rating Pin Configuration The OB2269P is offered in DIP and SOP packages shown as below. Package RθJA (℃/W) DIP8 SOP8 90 150 圣 Value 30 V VDD_Clamp+0.1V 龙 Absolute Maximum Ratings Parameter VDD/VIN DC Supply Voltage VDD Zener Clamp VoltageNote VDD Clamp Continuous Current FB Input Voltage Sense Input Voltage RT Input Voltage RI Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) 10 mA ia lt o -0.3 to 7V -0.3 to 7V -0.3 to 7V -0.3 to 7V en t Ordering Information Part Number Description With Frequency Shuffling, OB2269PAP DIP8, Pb-free in Tube With Frequency Shuffling, OB2269PCP SOP8, Pb-free in Tube With Frequency Shuffling, OB2269PCPA SOP8, Pb-free in Taping -40 to 150 ℃ -55 to 150 ℃ 260 ℃ ht C on f id Note: VDD_Clamp has a nominal value of 35V. 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. OB2269P X Package A:DIP8 C:SOP8 X Package Pb-free Blank : Normal P : Lead Free Packing Blank : Tube A : Taping O nB rig Current Mode PWM Controller With Freq Shuffling X ©On-Bright Electronics Confidential -2- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling 2 FB I 3 VIN I 4 RI I 5 RT I 6 SENSE I 7 8 VDD GATE Description Ground Feedback input pin. PWM duty cycle is determined by voltage level into this pin and current-sense signal level at Pin 6. Connected through a large value resistor to rectified line input for Startup IC supply and line voltage sensing. Internal Oscillator frequency setting pin. A resistor connected between RI and GND sets the PWM frequency. Temperature sensing input pin. Connected through a NTC resistor to GND. Current sense input pin. Connected to MOSFET current sensing resistor node. DC power supply pin. Totem-pole gate drive output for power MOSFET. id I/O P on f Pin Name GND C Pin Num 1 en t TERMINAL ASSIGNMENTS ia lt o 龙 圣 Marking Information O nB rig ht P O ©On-Bright Electronics Confidential -3- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling C on f id en t ia lt o 龙 圣 BLOCK DIAGRAM RECOMMENDED OPERATING CONDITION Min 12 24 -20 ht Parameter VDD Supply Voltage RI Resistor Value Operating Ambient Temperature Max 23 31 85 Unit V Kohm ℃ O nB rig Symbol VDD RI TA ©On-Bright Electronics Confidential -4- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling ESD INFORMATION Parameter Human Body Model on All Pins Except VIN and VDD Machine Model on All Pins HBMNote MM Test Conditions Min Typ Max Unit MIL-STD 3 KV JEDEC-STD 250 V 圣 Symbol 龙 Note: HBM all pins pass 3KV except High Voltage Input pin. The details are VIN passes 1kV, VDD passes 1.5KV, all other I/Os pass 3KV. In system application, High Voltage Input pin is either a high impedance input or connected to a cap. The lower rating has minimum impacts on system ESD performance. Min Typ lt (TA = 25℃, VDD=16V, RI=24Kohm if not otherwise noted) Symbol Parameter Test Conditions Supply Voltage (VDD) VDD Start up VDD =15V, Measure I_VDD_Startup Current current into VDD I_VDD_Operation Operation Current VFB=3V VDD Under Voltage UVLO(Enter) Lockout Enter VDD Under Voltage UVLO(Exit) Lockout Exit (Startup) VDD Over Voltage OVP(ON) Protection Enter VDD Over Voltage OVP(OFF) Protection Exit (Recovery) OVP_Hys OVP Hysteresis OVP(ON)-OVP(OFF) VDD OVP TD_OVP Debounce time VDD Zener Clamp VDD_Clamp I(VDD ) = 5mA Voltage Feedback Input Section(FB Pin) AVCS PWM Input Gain ΔVFB /ΔVcs o ELECTRICAL CHARACTERISTICS ia 6.5 FB pin short circuit current Zero Duty Cycle FB VTH_0D Threshold Voltage Burst Mode FB VTH_BM Threshold Voltage Power Limiting FB VTH_PL Threshold Voltage Power limiting TD_PL Debounce Time ZFB_IN Input Impedance Current Sense Input(Sense Pin) Sense Input T_blanking Leading Edge Blanking Time Sense Input ZSENSE_IN Impedance Short FB pin to GND, measure current O ©On-Bright Electronics 20 uA 1.7 mA 10.2 11.2 V 15.2 16.2 17.2 V 24 25.5 27 V 21.5 23 24.5 V 2.5 V 80 uSec 35 V 2.8 6.3 V/V 0.45 mA V 0.95 nB IFB_Short Unit 9.2 en t id on f C ht VFB Open Voltage rig VFB_Open Max Confidential -5- V 1.7 V 4.4 V 80 mSec 7.2 Kohm 250 nS 30 Kohm Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller ∆f_Temp ∆f_VDD RI_range V_RI_open F_BM DC_max DC_min -20℃ to 100℃ VDD = 12-25V V 龙 ms 65 12 Io = -20 mA Io = +20 mA V 圣 0.81 60 70 KHZ 2 % 2 % 24 2.0 60 22 Kohm V KHZ 75 80 85 % - - 0 % 0.3 V V 11 18 V CL = 1nf CL = 1nf 120 50 nSec nSec 70 uA ht C VDD=20V rig 1.015 nB O ©On-Bright Electronics 0.95 4 on f Gate Drive Output VOL Output Low Level VOH Output High Level Output Clamp VG_Clamp Voltage Level T_r Output Rising Time T_f Output Falling Time Over Temperature Protection Output Current of I_RT RT pin OTP Threshold VTH_OTP Voltage OTP Recovery VTH_OTP_off Threshold Voltage OTP De-bounce TD_OTP Time RT Pin Open V_RT_Open Voltage Frequency Shuffling Frequency ∆f_OSC Modulation range /Base frequency Freq_Shuffling Shuffling Frequency nSec o Normal Oscillation Frequency Frequency Temperature Stability Frequency Voltage Stability Operating RI Range RI open voltage Burst Mode Base Frequency Maximum Duty Cycle Minimum Duty Cycle FOSC I(VIN) = 150uA 0.90 lt T_ss Oscillator 0.85 ia VTH_OC_1 I(VIN) = 0uA 120 en t VTH_OC_0 CL=1nf at GATE, id Over Current Detection and Control Delay Current Limiting Threshold at No Compensation Current Limiting Threshold at Compensation Soft start time TD_OC Frequency Shuffling RI = 24Kohm Confidential -6- 1.065 1.115 V 1.165 V 100 uSec 3.5 V ±4% % 64 HZ Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling CHARACTERIZATION PLOTS I_startup vs Temperature I_operation vs Load 6.0 10.0 8.0 6.0 5.0 Fosc=50kHz Fosc=65kHz Fosc=100kHz 4.0 圣 12.0 3.0 2.0 1.0 35 60 85 110 135 0 Temperature(℃) 1.5 2 lt ia UVLO_OFF vs Temperature 19.0 UVLO_OFF(V) en t 14.0 12.0 10.0 id 8.0 6.0 17.0 15.0 13.0 11.0 -40 -15 10 on f -40 -15 10 35 60 85 110 135 C rig 1.0 I_RT(uA) 1.5 nB 0.0 10.0 70.0 65.0 15.0 20.0 25.0 -40 -15 VDD Voltage(V) 10 35 60 85 110 135 Temperature( ℃) O 5.0 72.5 67.5 0.5 0.0 85 110 135 75.0 ht 2.0 60 I_RT vs Temperature VDD UVLO and Operation Current 2.5 35 Temperature(℃) Temperature(℃) VDD Current(mA) 1 Gatedrive Loading(nF) UVLO_ON vs Temperature UVLO_ON(V) 0.5 o -40 -15 10 龙 I_operation(mA) I_startup(uA) 14.0 ©On-Bright Electronics Confidential -7- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency vs Temperature Frequency Shuffling Vth_OC vs Ivin 1.0 65.0 60.0 55.0 0.9 0.8 圣 70.0 0.7 0.6 -40 -15 10 35 60 85 110 135 0 50 100 Temperature(℃) 150 200 250 300 o Ivin(uA) 14.0 Frequency(kHz) 120.0 80.0 en t 10.0 8.0 ia 160.0 12.0 lt Frequency vs RI I_startup vs VDD I_startup(uA) 龙 Vth_OC(V) Frequency(kHz) 75.0 6.0 4.0 0 2 4 6 8 id 2.0 0.0 10 12 14 16 0.0 10 15 20 25 30 35 40 45 50 55 60 RI(Kohm) O nB rig ht C on f VDD VOLTAGE(V) 40.0 ©On-Bright Electronics Confidential -8- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling thus to reduce the standby power consumption to the greatest extend. The nature of high frequency switching also reduces the audio noise at any loading conditions. OPERATION DESCRIPTION The OB2269P is a highly integrated PWM controller IC optimized for offline flyback converter applications. The extended burst mode control greatly reduces the standby power consumption and helps the design easily meet the international power conservation requirements. 圣 z 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. 龙 • Startup Current and Start up Control Startup current of OB2269P is designed to be very low so that VDD could be charged up above UVLO(exit) threshold level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power loss yet reliable startup in application. For a typical 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 yet low power dissipation design solution. z o 1560 ( Khz ) RI ( Kohm) lt FOSC = en t ia Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2269P 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. id z Operating Current The Operating current of OB2269P is low at 1.7mA (typical). Good efficiency is achieved with OB2269P low operating current together with extended burst mode control schemes. on f z Frequency shuffling for EMI improvement The frequency Shuffling/jittering (switching frequency modulation) is implemented in OB2269P. The oscillation frequency is modulated with an internally generated random source so that the tone energy is evenly spread out. The spread spectrum minimizes the conduction band EMI and therefore eases the system design in meeting stringent EMI requirement. z ht C 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. rig z Burst Mode Operation At zero load or light load condition, most 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. OB2269P adjusts the switching mode according to the loading condition. At the load level of no load to light/medium load, the FB input drops below burst mode threshold level (1.8V) and the device enters Burst Mode control. The Gate driver output switches only when VDD voltage drops below a preset level and FB input is active to output an on state. Otherwise the gate driver remains at off state to minimize the switching loss O nB z Over Temperature Protection A NTC resistor in series with a regular resistor should connect between RT and GND for temperature sensing and protection. NTC resistor value becomes lower when the ambient temperature rises. With the fixed internal current IRT flowing through the resistors, the voltage at RT pin becomes lower at high temperature. The internal OTP circuit is triggered and shutdown the MOSFET when the sensed input voltage is lower than VTH_OTP. ©On-Bright Electronics z Gate Driver OB2269P Gate pin is connected to the Gate of an external MOSFET for power switch control. Too Confidential -9- Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller 圣 龙 o lt O nB rig ht C on f id en t z Protection Controls Good system reliability is achieved with OB2269P’s rich protection features including Cycle-by-Cycle current limiting (OCP), Over Load Protection (OLP), over temperature protection (OTP), on-chip VDD over voltage protection (OVP) and under voltage lockout (UVLO). The OCP threshold value is self adjusted lower at higher current into VIN pin. This OCP threshold slope adjustment helps to compensate the increased output power limit at higher AC voltage caused by inherent Over-Current sensing and control delay. A constant output power limit is achieved with recommended OCP compensation scheme on OB2269P. At output overload condition, FB voltage is biased higher. When FB input exceeds power limit threshold value for more than 80mS, control circuit reacts to turnoff the power MOSFET. Similarly, control circuit shutdowns the power MOSFET when an Over Temperature condition is detected. OB2269P resumes the operation when temperature drops below the hysteresis value. VDD is supplied with transformer auxiliary winding output. It is clamped when VDD is higher than 35V. MOSFET is shut down when VDD drops below UVLO(enter) limit and device enters power on startup sequence thereafter. ia weak the gate driver strength results in higher conduction and switching loss of MOSFET, while too strong gate driver output compromises the EMI. Good tradeoff is achieved through the built-in totem pole gate drive 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. Frequency Shuffling ©On-Bright Electronics Confidential - 10 - Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling PACKAGE MECHANICAL DATA Symbol Dimensions In Millimeters Min Max 3.710 5.334 0.381 2.921 4.953 0.350 0.650 1.524 (BSC) 0.200 0.360 9.000 10.160 6.096 7.112 7.320 8.255 2.540 (BSC) 2.921 3.810 7.620 10.920 O nB rig A A1 A2 B B1 C D E E1 e L E2 ht C on f id en t ia lt o 龙 圣 8-Pin Plastic DIP ©On-Bright Electronics Confidential - 11 - Dimensions In Inches Min Max 0.146 0.210 0.015 0.115 0.195 0.014 0.026 0.06 (BSC) 0.008 0.014 0.354 0.400 0.240 0.280 0.288 0.325 0.1 (BSC) 0.115 0.150 0.300 0.430 Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling C on f id en t ia lt o 龙 圣 8-Pin Plastic SOP O nB rig A A1 A2 b c D E E1 e L θ Dimensions In Millimeters Min Max 1.350 1.750 0.050 0.250 1.250 1.650 0.310 0.510 0.100 0.250 4.700 5.150 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0º 8º ht Symbol ©On-Bright Electronics Confidential - 12 - Dimensions In Inches Min Max 0.053 0.069 0.002 0.010 0.049 0.065 0.012 0.020 0.004 0.010 0.185 0.203 0.150 0.157 0.228 0.244 0.050 (BSC) 0.016 0.050 0º 8º Preliminary OB_DOC_DS_2269P00 OB2269P Current Mode PWM Controller Frequency Shuffling IMPORTANT NOTICE 圣 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. lt o 龙 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. en t ia 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 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 - Preliminary OB_DOC_DS_2269P00