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MP1521 数据表(PDF) 6 Page - Monolithic Power Systems |
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MP1521 数据表(HTML) 6 Page - Monolithic Power Systems |
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6 / 8 page ![]() MP1521 High Efficiency White LED Driver MP1521 Rev 2.7 10/06/04 www.monolithicpower.com 6 Monolithic Power Systems 8 7 IN BRT FB1 OLS SW 10 GND 9 CIN 4.7µF VIN COUT 1µF EN REF 4 3 2 1 D1, B130 20 MP1521 L1 6 5 FB2 FB3 White LEDs EN GND OFF ON BRT Application Circuits Figure 3: One String of Four (4) LEDs Figure 4: One String of Six (6) LEDs (Low inductor height for portables) 8 7 IN BRT FB1 OLS SW 10 GND 9 CIN 4.7µF VIN COUT 1µF EN REF 4 3 2 1 D1, B130 20 MP1521 L 47µH 6 5 FB2 FB3 White LEDs BRT EN GND OFF ON Line regulation using 1.2mm High Sumida CMD4D11 Inductor 15.0 17.0 19.0 21.0 23.0 2.5 3 3.5 4 4.5 VIN (V) 6.8µH 10µH 15µH Efficiency vs VIN using 1.2mm High Sumida CMD4D11 Inductor 70 75 80 85 2.5 3 3.5 4 4.5 VIN (V) 6.8µH 10µH 15µH 15 16 17 18 19 20 21 22 2.4 3.0 3.6 4.2 VIN (V) Efficiency vs LED current using 47µH Toko D62CB Inductor 75 80 85 90 VIN = 4V VIN = 3V Line regulation using 47µH Toko D62CB Inductor LED Current mA 5 10 15 20 |
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