OB3396

High Precision Off-line Primary-Side PWM Power Switch OB3396 GENERAL DESCRIPTION OB3396 is a primary side regulation off-line LED lighting controller which can achieve accurate LED current. It significantly simplifies LED lighting system design by eliminating the secondary side feedback circuitry. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. The LED current (CC control) can be adjusted externally by the resistor Rs at SOURCE pin. 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. OB3396 offers comprehensive 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. OB3396 is offered in DIP8 package. FEATURES „ High Precise Constant Current Regulation at Universal AC input „ Primary-side Sensing and Regulation Without TL431 and Opto-coupler „ Programmable 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 „ 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 TYPICAL APPLICATI...