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AN4130 数据表(PDF) 13 Page - STMicroelectronics |
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AN4130 数据表(HTML) 13 Page - STMicroelectronics |
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13 / 41 page  AN4130 Theory of operation Doc ID 023315 Rev 1 13/41 Where: ● Yellow = line voltage ● Magenta = line current, 50 mA/div ref -3div ● Blue = Voltage at ILED pin, ref -3 div ● Green = Voltage at bottom of 4.7 µF cap on ILED pin. Dissipated power is also reduced at low conduction angles due to the lower RMS input current: Figure 17. Power loss vs. dimmed RMS line voltage (120 V line) Figure 18. Output current vs. dimmed RMS line Note that the dimming curve for the Schottky diode unit is much smoother and slightly lower at the low end. This allows the unit to meet the requirements of NEMA SSL 6-2010, as shown in Figure 25. |
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