AP8802H

60V 1A LED Step-down Converter

AP8802H

Document number: DS32227 Rev. 1 - 2

6 of 11

www.diodes.com

June 2010

© 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.