OB2212 – Primary-Side Regulation PWM Power Switch

Part Number : OB2212

Function : Primary-Side Regulation PWM Power Switch

Manufactures : On-Bright

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OB2212 image

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Description :

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 rating […]

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OB2212 Datasheet

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