AP8802 Diodes, Inc., AP8802 Datasheet - Page 7

• Manufacturer Part Number: AP8802
• Description: 1a Led Step-down Converter
• Manufacturer: Diodes, Inc.

Application Information
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.
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.
AP8802 Rev. 3
DS31766
500
450
400
350
300
250
200
150
100
50
0
0
50
47
47
68
68
68
100
100
100
100
Figure 4: Switching Frequency Vs Inductor Value
150
150
150
150
Switching Frequency @ ILED = 700mA
(Continued)
200
Inductor Value [uH]
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220
220
220
250
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300
350
1A LED Step-down Converter
400
450
470
470
470
500
©
AP8802
MARCH 2009
Diodes Incorporated
12V - 3 LEDs
24V - 5 LEDs
48V - 10 LEDs