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AN2590 Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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AN2590 Scheda tecnica(HTML) 3 Page - STMicroelectronics |
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3 / 17 page ![]() AN2590 List of figures 3/17 List of figures Figure 1. Typical dimmer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 2. Dimming CFL ballast solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 3. Typical dimming system consisting of incandescent lamp and triac dimmer . . . . . . . . . . . . 4 Figure 4. Block diagram of formal CFL ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 5. The half AC line cycle of sinuous wave and firing angle. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 6. Schematic of the reference design board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 7. Main circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 8. L1 current per switching period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 9. L1 current shape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 10. PCB top-side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 11. PCB bottom-side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 12. Full load efficiency vs. AC line input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 13. Triac turn-on time vs. power dissipation to the lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 14. AC input voltage and current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 15. L1 voltage and current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 16. Power factor in operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 17. Lamp voltage and current at Ton=9 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13 Figure 18. Lamp voltage and current at Ton=5 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13 Figure 19. Lamp voltage and current at Ton=3 ms, Vlamp=100 V/div, Ilamp= 200 mA/div. . . . . . . . . 13 |
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