AP8801_0912 Datasheet, PDF (8/11 Pages) Diodes Incorporated – 500mA LED Step-down Converter

AP8801
500mA LED Step-down Converter
Application Information (Continued)
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
1.4
1.2
1
SOP8L
0.8
0.6
MSOP8L
0.4
0.2
0
0
25
50
75
100
125
150
Ambient Temperature (Deg C)
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
AP8801 Rev. 4
DS31765
8 of 11
www.diodes.com
DECEMBER 2009
© Diodes Incorporated