The IRPLLNR2 is a high efficiency, high power factor, fixed output electronic ballast designed for driving rapid start fluorescent lamp types. The ballast control section is built around the IR21571 Ballast Control IC, IC2 of the Demo board. The IR21571 contains an oscillator, a high voltage half-bridge gate driver and lamp fault protection circuitry. Get detail information of Circuit Diagram for Electronic Ballast Controller of a Fluorescent Lamp using IR21571 here – free download PDF file. (source: