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The IRPLDIM2U Demo Board consists of an EMI filter, an active power factor correction front end, a ballast control section, a digital control section and a resonant lamp output stage. A block diagram of the design is shown in Figure 3. The EMI filter blocks ballast generated noise. The power factor correction is used for sinusoidal input current and a regulated DC bus. The ballast control section provides frequency modulation control of a traditional RLC lamp esonant output circuit for preheating, igniting and ballasting the lamp. It is easily adaptable to a wide variety of lamp types. The digital control section provides the Digitally Addressable Lighting Interface (DALI) and the necessary circuitry and software to perform closed-loop dimming, lamp fault detection, shutdown and auto-restart.
IRPLDIM2U Features
• Lamp Type: 1X 32W T8 Lamp • Line Input: 90-140VAC/60Hz • 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
