INTRODUCTION
This reference design is a high efficiency, high power factor, digital dimming electronic ballast designed to drive rapid start fluorescent lamp types. The design contains an active power factor correction circuit for universal voltage input as well as a ballast control circuit using the IR21592. The design also includes a PIC16F628 microcontroller and an isolation circuit for connecting to a Digitally Addressable Lighting Interface (DALI). Other features include EMI filtering, transient protection and lamp fault protection.

FEATURES
• Lamp Type: 1X 36W T8 Lamp
• Line Input: 185-265 VAC/50 Hz
• Interface DALI (2 wires)
• High Power Factor/ Low THD
• High Frequency Operation
• Programmable Lamp Filament Preheating
• Programmable Ignition
• High precision Digital Dimming
• Logarithmic Dimming
• Diagnostic and fault control
• Lamp Fault Protection
• Brownout Protection
• IR21592 HVIC Ballast Controller
• PIC16F628 Microcontroller
• Optically Isolated Communications
• Low power standby mode