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AP8802 Datasheet(PDF) 7 Page - Diodes Incorporated |
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AP8802 Datasheet(HTML) 7 Page - Diodes Incorporated |
7 / 16 page AP8802 1A LED Step-down Converter AP8802 Rev. 5 7 of 16 DECEMBER 2009 DS31766 www.diodes.com © Diodes Incorporated Inductor Selection This section highlights how to select the inductor suitable for the application requirements in terms of switching frequency, LED current accuracy and temperature. Switching Frequency @ILED = 700mA 47 68 100 150 220 470 47 68 100 150 220 470 68 100 150 220 470 0 50 100 150 200 250 300 350 400 450 500 0 50 100 150 200 250 300 350 400 450 500 Inductor Value [uH] 12V - 3 LEDs 24V - 5 LEDs 48V - 10 LEDs Figure 4: Switching Frequency Vs Inductor Value The inductor influences the LED current accuracy that the system is able to provide. The following section highlights how to select the inductor in relation to the device packages and the LED current, while maintaining the chip temperature below 70˚C. Application Information (Continued) |
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