SY5800A - Silergy

SY5800A Single Stage Flyback And PFC Controller

The SY5800A is a single stage Flyback and 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 p.

Features

• Primary side control eliminates the opto-coupler.
• Valley turn-on of the primary MOSFET to achieve low switching losses
• 0.3V primary current sense reference voltage leads to a lower sense resistance thus a lower conduction loss.
• Internal high current MOSFET driver: 1A sourcing and 2A sinking
• Low start up current: 15uA typical
• Reliable short LED and Open LED protection
• Power factor >0.90 with single-stage conversion.
• Compact package: MSOP10 and SO8 Applications
• LED lighting
• Down light
• Tube lamp
• PAR lamp
• Bulb Figure 1. Schematic Diagram MSOP10 SY5800A Rev. 0.1 Silergy.