SY5839

Application Notes: AN_SY5839 Single Stage Buck PFC Controller For LED Lighting Preliminary datasheet General Description The SY5839 is a single stage Buck PFC controller targeting at LED lighting applications. It is a primary side controller without applying any secondary feedback circuit for low cost, and drives the Flyback converter in the quasi-resonant mode to achieve higher efficiency. It keeps the Flyback converter in constant on time operation to achieve high power factor. It adopts special design to achieve quick start up and reliable protection for safety requirement. Ordering Information SY5839 □(□□)□ Tempera ture Code Packa ge Code Optional Spec Code Ordering Number SY5839ABC Package type SOT23-6 Note ---- Typical Applications Features Valley turn-on of the MOSFET to achieve low switching losses Power factor >0.90 with single-stage conversion. Low start up current: 15µ A typical Quick start up <500ms Reliable short LED and Open LED prote...