AP8800

350mA LED Step-Down Converter

AP8800 Rev. 1

7 of 11

MARCH 2009

www.diodes.com

Inductor Selection

Figure 4 displays the resulting switching frequency varying the main circuit parameters: Supply voltage,

Inductor value and number of LEDs to be driven.

Thermal Considerations

The graph below in figure 4, gives details for power derating. This assumes the device to be mounted on a

25x25mm PCB with 1oz copper standing in still air.

Maximum Power Dissipation

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0

25

50

75

100

125

150

Ambient Temperature (Deg C)

DFN3030-10

SOP8L

MSOP8L

Figure 4: Derating curve