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Application Note AN-1062 IRPLMB1E - 25W 230VAC Small Size Ballast Using IR2520D By Cecilia Contenti Table of Contents Page Overview ...1 Features ...2 Electrical Characteristics ...2 IR2520D Ballast Control IC ...2 Circuit Description ...3 Miniballast 1 Bill of Materials ...4 Functional Description ...5 Fault Conditions ...6 Open Filaments Protection...7 Low AC Line Protection ...8 Miniballast Layout ...9 Design Tip: Auto Restart Option...11 Different Procedure to Adapt the Design...12 Small sizes ballasts (often called Matchbox ballasts) are becoming very common in Europe to drive a wide range of lamps with power between 18W and 26W like PLC 18W, PLT 18W, TC-L 18W, TC-L 24W, TC-F 18W, TC-F 24W, TC-DEL/TEL 26W, T5 24W, T8 18W, T5C 22W and TR 22W. Limiting the maximum power to 25W the design does not need to conform to THD and PF requirements and this allows saving the PFC stage reducing the components count and maintaining a very small size. APPLICATION NOTE By AN-1062 International Rectifier · 233 Kansas Street El Segundo CA 90245 USA IRPLMB1E - 25W 230VAC small size ballast using IR2520D Cecilia Contenti Topics Covered Overview Features Electrical Characteristics IR2520D Ballast Control IC Circuit Description Miniballast Circuit Diagram Functional Description Fault Conditions Miniballast Layout Design Tip: AUto-restart Option Design Procedure to adapt the design to different lamp types 1. Overview Small sizes ballasts (often called Matchbox ballasts) are becoming very common in Europe to drive a wide range of lamps with power between 18W and 26W like PLC 18W, PLT 18W, TC-L 18W, TC-L 24W, TC-F 18W, TC-F 24W, TC-DEL/TEL 26W, T5 24W, T8 18W, T5C 22W and TR 22W. Limiting the maximum power to 25W the design does not need to conform to THD and PF requirements and this allows saving the PFC stage reducing the components count and maintaining a very small size. The MINIBALLAST1 is an electronic ballast for driving 26W compact fluorescent lamps from 220VAC. The circuit provides all of the necessary functions for preheat, ignition and on-state operation of