OB3341S

On-Bright confidential to ... OB3341S Buck LED Driver with High PF GENERAL DESCRIPTION The OB3341S is a high power factor, monolithic Buck regulator with advanced features to provide high efficiency control and high accuracy constant current output for LED lighting applications. OB3341S integrates a 2A MOSFET to decrease physical volume. It adopts constant on time control for power factor correction (PFC), zero current detectors (ZCD) to ensure quasi-resonant valley turn-on for high efficiency operation. OB3341S offers good protection coverage including VCC under voltage lockout (UVLO), VCC over voltage protection, cycle-by-cycle current limiting, over temperature protection, COMP pin floating protection and LED open/short protection. OB3341S is provided with DIP8 package. FEATURES  Buck topology power switching with single stage PFC (PF>0.9)  Integrated 2A 600V MOSFET  Quasi-resonant valley turn-on mode operation to achieve high efficiency (>90%)  High accuracy output current (±3%)  LED open/short protection  Low power dissipation at LED short  Ultra-low start-up current (typical 5uA) APPLICATIONS  LED lighting  Tube lighting  PAR lighting  Bulb lighting TYPICAL APPLICATION +Vin OB3341S 1 VCC DRAIN 8 2 ZCD DRAIN 7 3 GND SOURCE 6 4 COMP CS 5 Figure1: OB3341S Typical Application Schematic ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_3341S00 GENERAL INFORMATION Terminal Assignment In DIP8 Package. VCC ZCD GND COMP 1 2 3 ...