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AP8801
500mA LED STEP-DOWN CONVERTER
Application Information
LED Current Control
The LED current is controlled by the resistor R SET in Figure 14 connected between V IN and SET. The nominal average output current in the
LED(s) is defined as:
I LED =
V THD
R SET
where V THD is the voltage between the V IN and SET pins and is nominally 200mV.
Figure. 14 Typical Application Circuit for I LED = 0.3A
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
Switching Frequency @I LED = 500mA
100
500
47
68
12V - 1 LED
24V - 3 LEDs
400
300
100
150
220
48V - 6 LEDs
47
150
200
100
68
100
150
220
470
470
220
470
0
0
50
100
150
200
250
300
350
400
450
500
INDUCTOR VALUE (μH)
Figure. 15 Switching Frequency vs. Inductor Value
AP8801
Document number: DS31765 Rev. 7 - 2
6 of 14
www.diodes.com
June 2012
? Diodes Incorporated
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