AP8801_0912 Datasheet, PDF (6/11 Pages) Diodes Incorporated – 500mA LED Step-down Converter

AP8801
500mA LED Step-down Converter
Application Information (Continued)
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.
600
500
400
300
200
100
0
0
Switching Frequency @ ILED = 500mA
47
100
68
150
100
220
47
150
68
220
100
470
150
220
470
470
50
100
150
200
250
300
350
400
450
500
Inductor Value [uH]
Figure 4: Switching Frequency Vs Inductor Value
12V - 1 LED
24V - 3 LEDs
48V - 6 LEDs
AP8801 Rev. 4
DS31765
6 of 11
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DECEMBER 2009
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