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OB2538 Dataheets PDF



Part Number OB2538
Manufacturers On-Bright Electronics
Logo On-Bright Electronics
Description High Precision CC/CV Primary-Side PWM Controller
Datasheet OB2538 DatasheetOB2538 Datasheet (PDF)

On-Bright Confidential to ACT OB2538 High Precision CC/CV Primary-Side PWM Controller Product Specification GENERAL DESCRIPTION OB2538 is a high performance 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. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CC control, the current and output po.

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On-Bright Confidential to ACT OB2538 High Precision CC/CV Primary-Side PWM Controller Product Specification GENERAL DESCRIPTION OB2538 is a high performance 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. 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. In addition, good load regulation is achieved by the built-in cable drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction at light/medium load. OB2538 offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. High precision constant voltage (CV) and constant current (CC) can be achieved by OB2538. . FEATURES „ 5% Constant Voltage Regulation, 5% Constant Current Regulation at Universal AC input „ Primary-side Sensing and Regulation Without TL431 and Opto-coupler „ Programmable CV and CC Regulation „ Adjustable Constant Current and Output Power Setting „ Built-in Secondary Constant Current Control with Primary Side Feedback „ Built-in Adaptive Current Peak Regulation „ Built-in Primary winding inductance compensation „ Programmable Cable drop Compensation „ Power on Soft-start „ Built-in Leading Edge Blanking (LEB) „ Cycle-by-Cycle Current Limiting „ VDD Under Voltage Lockout with Hysteresis (UVLO) „ VDD OVP „ VDD Clamp 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 OB2538 is offered in DIP8 package. Fig.1. Typical CC/CV Curve TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_253800 On-Bright Confidential to ACT OB2538 High Precision CC/CV Primary-Side PWM Controller GENERAL INFORMATION Pin Configuration The pin map is shown as below for DIP8. VDD 1 8 GND COMP 2 7 GND INV 3 6 DRAIN CS 4 5 DRAIN Ordering Information Part Number Description OB2538AP DIP8, Pb-free, Tube Package Dissipation Rating Package RθJA (℃/W) DIP8 75 Note: Drain Pin Connected 100mm2 PCB copper clad. . Absolute Maximum Ratings Parameter Value Drain Voltage (off state) -0.3V to Bvdss VDD Voltage VDD Zener Clamp Continuous Current -0.3 to VDD_clamp 10 mA COMP Voltage -0.3 to 7V CS Input Voltage -0.3 to 7V INV Input Voltage -0.3 to 7V Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg 150 oC -55 to 150 oC Lead T.


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