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OB2211 Dataheets PDF



Part Number OB2211
Manufacturers On-Bright
Logo On-Bright
Description Primary-Side Regulation PWM Power Switch
Datasheet OB2211 DatasheetOB2211 Datasheet (PDF)

OB2211/OB2212 Primary-Side Regulation PWM Power Switch GENERAL DESCRIPTION OB2211/OB2212 is an offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CC control, the current and output power setting can be adjusted externally by the sense .

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OB2211/OB2212 Primary-Side Regulation PWM Power Switch GENERAL DESCRIPTION OB2211/OB2212 is an offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated from design. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CC control, the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV control, multi-mode operations are utilized to achieve high performance and high efficiency. Device operates in fixed frequency mode at large load conditions, frequency reduction mode at light/medium load and ‘Extended burst mode’ at No/light load conditions. OB2211/OB2212 offers power on soft start control and complete protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD over-voltage clamp and UVLO, fail-safe protection for open loop fault condition. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique together with soft switching control at the totem pole gate drive output with No-Y cap design. FEATURES „ Primary-side Sensing and Regulation With No TL431 and Opto-coupler „ Multi-mode Operation for High Efficiency „ Programmable CV and CC Regulation „ Adjustable Constant Current and Output Power setting „ Frequency Shuffling and Adjustable Gate Drive Greatly Improving EMI „ Power on Soft-start Time (4ms) „ “Extended Burst Mode Control” for Improved Efficiency and Minimum Standby Design „ Built-in Leading Edge Blanking (LEB) „ Cycle-by-Cycle Current Limiting „ VDD Under Voltage Lockout with Hysteresis (UVLO) „ VDD Over Voltage Shutdown and Clamp „ Auto-restart in Over Voltage condition „ Fail-safe protection for open loop fault condition APPLICATIONS Low Power AC/DC offline SMPS for „ Cell Phone Charger „ Digital Cameras Charger „ Small Power Adaptor „ Auxiliary Power for PC, TV etc. „ Linear Regulator/RCC Replacement OB2211 is offered in SOP8 package. OB2212 is offered in DIP8 package Fig 1. Typical CC/CV Curve TYPICAL APPLICATION ©On-Bright Electronics -1- On-Bright Confidential to MicroBridge OB_DOC_DS_1100 OB2211/OB2212 Primary-Side Regulation PWM Power Switch GENERAL INFORMATION Pin Configuration The pin map is shown as below for SOP8 and DIP8. Absolute Maximum Ratings Parameter Drain Voltage (off state) VDD Voltage VDDG Voltage VDD Zener Clamp Continuous Current CS Input Voltage INV Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Value -0.3V to 650V -0.3 to 33 V -0.3 to 33 V 10 mA -0.3 to 7V -0.3 to 7V -20 to 150 oC -55 to 150 oC 260 oC Ordering Information Part Number Description OB2211CP SOP8, Pb-free, Tube OB2211CPA SOP8, Pb-free, T&R OB2212AP DIP8, Pb-free 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. OB2211 X X X Primary-Side Regulation PWM Power Switch Package C:SOP8 Package Pb-free P: Lead Free Packing Blank : Tube A : Taping ©On-Bright Electronics -2- On-Bright Confidential to MicroBridge OB_DOC_DS_1100 OB2211/OB2212 Primary-Side Regulation PWM Power Switch Marking Information TERMINAL ASSIGNMENTS Pin Num 1 2 3 4 5/6 7/8 Pin Name VDDG VDD INV CS Drain GND I/O P P I I O P Description Internal Gate Driver Power Supply IC DC power supply Input Inverting input of error amplifier (EA). Connected to resistor divider from primary sensing winding reflecting output voltage. PWM duty cycle is determined by EA output and current sense signal at pin 4. Current sense input HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer Ground Output Power Table Product OB2211 OB2212 Notes: 1. 230VAC±15% Open Frame1 10W 20W 90-264VAC Open Frame1 8W 12W Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50℃ ambient. ©On-Bright Electronics -3- On-Bright Confidential to MicroBridge OB_DOC_DS_1100 OB2211/OB2212 Primary-Side Regulation PWM Power Switch BLOCK DIAGRAM VDDG 1 Drain 5/6 Soft Driver Power MOSFET Frequency Shuffling PWM, & Control Logic CC/CV Operation Burst mode controller VDD 2 UVLO POR Soft start LEB CS 4 Regulator Internal supply PWM Genterator 1.25V EA 8 GND Error Amplifier INV 3 ©On-Bright Electronics -4- On-Bright Confidential to MicroBridge OB_DOC_DS_1100 OB2211/OB2212 Primary-Side Regulation PWM Power Switch ELECTRICAL CHARACTERISTICS (TA = 25OC, VDD=VDDG=16V, if not otherwise noted) Symbol Parameter Test Conditions Supply Voltage (VDD) Section I DD ST I DD .


ULN2003ADR2G OB2211 OB2212


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