OB2536 Datasheet | On-Bright

DESCRIPTION OB2536 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 pensation. 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. OB2536 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 OB2536. . 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 pensation - Programmable Cable drop pensation - 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 OB2536 is offered in DIP8 package. Fig.1. Typical CC/CV...