OB2226SP

OB2226 High Precision Low Cost MCM Power Switch GENERAL DESCRIPTION FEATURES OB2226 is a high performance, high precision and low cost PWM Power switch for non-isolated buck application. It combines a dedicated current mode PWM controller (with a high voltage power MOSFET with DIP7 package) and built-in error amplifier for low cost and component count. With precise inner resistor divider, precise reference of EA and load compensation, accurate constant voltage regulation at universal AC input can be guaranteed. For high efficiency, oscillator with frequency-reduction control is implemented. And EMI performance is achieved with On-Bright proprietary frequency shuffling technique. OB2226 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, over loading protection, output short-circuit protection, over temperature protection, VDD OVP, and UVLO. OB2226 is offered in SOP8 or DIP7 package.              Low cost and component count buck application Built-in error amplifier Load compensation Oscillator of fixed frequency with frequencyreduction control for high efficiency Frequency shuffling for EMI improvement Power on Soft-start Built-in Leading Edge Blanking (LEB) Cycle-by-Cycle Current Limiting Over Loading Protection Output Short-Circuit Protection Over Temperature Protection VDD Under Voltage Lockout with Hysteresis (UVLO) VDD OVP APPLICATIONS Low Power AC/DC offline SMPS for  Electrical Appliance  Linear Regulator/RCC Replacement TYPICAL APPLICATION VDD GND COMP GND* NC DRAIN CS DRAIN DC OUT AC IN Note : GND* Only in SOP8 package ©On-Bright Electronics Confidential -1- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch GENERAL INFORMATION Ordering Information Part Number Description OB2226SP DIP7, Pb-free, Tube OB2226CP SOP8, Pb-free, Tube OB2226CPA SOP8, Pb-free, T&R Pin Configuration The pin map is shown as below for SOP8 and DIP7. VDD COMP 1 8 GND 2 7 GND 6 DRAIN Package Dissipation Rating Package RθJA (℃/W) DIP7 75 SOP8 90 Note: Drain Pin Connected 100mm2 PCB copper clad. SOP8 NC CS VDD COMP 3 5 4 7 1 Absolute Maximum Ratings Parameter Drain Voltage (off state) VDD Voltage VDD Zener Clamp Continuous Current COMP Voltage CS Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) DRAIN GND 2 DIP7 NC CS 3 4 ©On-Bright Electronics 6 5 DRAIN Value -0.3V to BVdss -0.3 to 40V 10 mA -0.3 to 7V -0.3 to 7V -40 to 150 ℃ -55 to 150 ℃ 260 ℃ Note: 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. DRAIN Confidential -2- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch Marking Information TERMINAL ASSIGNMENTS Pin Num Pin Name I/O Description 1 VDD P Power Supply 2 COMP I Loop Compensation for CV Stability 3 NC I Not connected 4 CS I Current sense input 5/6 DRAIN O HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer / inductance. 7/8 GND P Ground OUTPUT POWER TABLE 90~300VAC 90~264VAC Buck topology, open frame Flyback topology, open frame OB2226SP 6.6W 10W OB2226CP 4.0W 6.0W Product ©On-Bright Electronics Confidential -3- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch BLOCK DIAGRAM OVP ©On-Bright Electronics Confidential -4- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch ELECTRICAL CHARACTERISTICS (TA = 25℃, VDD=16V, if not otherwise noted) Symbol Parameter Test Conditions Min Typ Max Unit 5 20 uA - 1.5 2.5 mA Supply Voltage (VDD) Section I DD ST Standby Current VDD=13V I DD op Operation Current Operation supply current CS=0V, VDD=18V UVLO(ON) VDD Under Voltage Lockout VDD falling Enter 8.2 9.0 10.5 V UVLO(OFF) VDD Under Voltage Lockout VDD rising Exit 13.5 14.8 16.0 V OVP Over voltage Threshold 26 27.5 29 V 19.3 20.0 V protection Ramp VDD until gate shut down VDD Regulation In normal regulation, VDD Ramp VDD until Comp 18.6 Voltage will be regulated to 19.3V voltage lower than 2.5V Current Sense Input Section TLEB LEB time Vth_oc Over current threshold Td_oc OCP propagation delay ZSENSE_IN Input Impedance 200 910 940 ns 970 110 mV ns 50 Kohm Frequency Section Freq_Max IC Maximum frequency △f/Freq Frequency shuffling range 40 45 50 KHz +/-6 % 60 dB 3.3 uA Error Amplifier Section Gain DC gain of EA I_COMP_MAX Max. Cable compensation current VDD=18V, Comp=0V Protection VTH_OLP Over loading protection threshold voltage 4 V Td_OLP Over load, debounce Time 100 ms OTP enter 150 ℃ OTP exit 130 ℃ Power MOSFET Section BVdss Rdson MOSFET Drain-Source Breakdown Voltage 600 V On Resistance(DIP7) Static, Id=0.45A 15 Ώ On Resistance(SOP8) Static, Id=0.45A 15 Ώ ©On-Bright Electronics Confidential -5- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch CHARACTERIZATION PLOTS UVLO(OFF)(V) vs Temperature(℃) UVLO(OFF)(V) UVLO(ON)(V) UVLO(ON)(V) vs Temperature(℃) 10.5 10.0 9.5 9.0 8.5 8.0 7.5 -40 -10 20 50 80 Temperature( ℃) 16.00 15.50 15.00 14.50 14.00 13.50 13.00 110 -40 50 80 20 Temperature(℃) 110 Istartup(uA) vs Temperature(℃) 60.0 Istartup(uA) Freq_Max(KHz) Freq_Max(KHz) vs Temperature(℃) -10 50.0 40.0 30.0 3.0 2.5 2.0 1.5 1.0 -40 -10 20 50 80 110 -40 Temperature(℃) -10 80 20 50 Temperature(℃) 110 Rdson(ohm) vs Temperature(℃ ) Rdson(ohm) 25.0 20.0 15.0 10.0 5.0 25 50 75 100 125 150 Tem perature(℃ ) ©On-Bright Electronics Confidential -6- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch OPERATION DESCRIPTION OB2226 is a cost effective PWM power switch optimized for off-line non-isolated buck applications including electrical appliance and linear regulator replacement. It operates in current mode and regulates output voltage with dedicated features. High integration can afford low cost and component count solution. Load Compensation for good CV regulation In OB2226, load compensation is implemented to achieve good load regulation. An offset voltage is generated at inverter input of EA by an internal current flowing into the resister divider. The current is inversely proportional to the voltage across pin COMP, as a result, it is inversely proportional to the output load current, therefore the output voltage can be compensated specially in zero loading condition. As the load current decreases from full-load to no-load, the offset voltage at inverter input of EA will increase.   Startup Current and Start up Control Startup current of OB2226 is designed to be very low so that VDD could be charged up above UVLO threshold and starts up quickly. A large value startup resistor can therefore be used to minimize the power loss in application. Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2226 current mode PWM control. The switch current is detected by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial internal power MOSFET on state so that the external RC filtering on sense input is no longer needed. The PWM duty cycle is determined by the current sense input voltage and the EA output voltage.   Operating Current The Operating current of OB2226 is as low as 1.5mA (typical). Good efficiency is achieved with the low operating current together with ‘Multimode’ control features.  Oscillator operation The switching frequency of OB2226 is internally fixed at 45KHz (typical). No external frequency setting components are required for PCB design simplification. At 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 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 light load or no load condition. The switch frequency reduces at light/no load condition to improve the conversion efficiency. The minimum switching frequency is 400Hz (typical).  Gate Driver The internal power MOSFET in OB2226 is driven by a dedicated gate driver for power switch control. Too weak the gate driver strength results in higher conduction and switch loss of MOSFET while too strong gate drive compromises EMI. A good tradeoff is achieved through the built-in totem pole gate design with right output strength control.  Protection Control Good power supply system reliability is achieved with its rich protection features including Cycle-byCycle current limiting (OCP), Over Loading Protection, Over Voltage Protection, Output ShortCircuit Protection and Under Voltage Lockout on VDD (UVLO). To prevent from any lethal thermal damage, OB2226 stops switching when the junction temperature exceeds 150℃（typical）. When the junction temperature drops below 130℃ （typical）, OB2226 resumes operation.  Frequency shuffling for EMI improvement The frequency shuffling (switching frequency modulation) is implemented in OB2226. 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.  Built-in error amplifier In OB2226, on-chip EA (error amplifier) is implemented to regulate output voltage. Through inner resistor divider, the VDD voltage is detected at inverter input of EA to regulate output voltage. ©On-Bright Electronics Confidential -7- Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch PACKAGE MECHANICAL DATA Symbol A A1 A2 B B1 C D E E1 e L E2 ©On-Bright Electronics 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 Confidential -8- 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 Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch Symbol A A1 A2 b c D E E1 e L θ ©On-Bright Electronics 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 Confidential -9- 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 Datasheet OB_DOC_DS_2226A3 OB2226 High Precision Low Cost MCM Power Switch IMPORTANT NOTICE 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. 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. 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. 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 - 10 - Datasheet OB_DOC_DS_2226A3