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AN2590 Scheda tecnica(PDF) 2 Page - STMicroelectronics |
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AN2590 Scheda tecnica(HTML) 2 Page - STMicroelectronics |
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2 / 17 page ![]() Contents AN2590 2/17 Contents 1 Typical dimming system for incandescent lamps . . . . . . . . . . . . . . . . . 4 1.1 Formal CFL ballast and its disadvantages . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Proposed solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Dimming function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Principle of the main circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Electrical specifications and reference design board . . . . . . . . . . . . . 10 3.1 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 PCB layout view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 Test results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.1 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 |
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