AP8801

500mA LED Step-down Converter

AP8801 Rev. 4

8 of 11

DECEMBER 2009

DS31765

www.diodes.com

Thermal Considerations

The graph below in figure 6, 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

0

25

50

75

100

125

150

Ambient Temperature (Deg C)

SOP8L

MSOP8L

Figure 6: AP8801 derating curves

Package Selection

The device comes with a wide selection of packages. The suggested package is able to provide a case

temperature below 70˚C (with an ambient temperature of 25˚C) for the combination of input voltage and load

requested.

Figure 7: Suggested package for a 500mA application

Application Information

(Continued)