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9 Thermal Performance
The board temperature was measured using an IR camera (HIS-3000, Wahl) while running under the
following conditions: V
IN
= 120V
RMS
, I
LED
= 181mA, # of LEDs = 12, P
OUT
= 6.5W.
NOTE: Thermal performance is highly dependent on the user's final end-application enclosure, heat-
sinking methods, ambient operating temperature, and PCB board layout in addition to the electrical
operating conditions. This LM3448 evaluation board is optimized to supply 6.5W of output power at room
temperature without exceeding the thermal limitations of the LM3448. However higher output power levels
can be achieved if precautions are taken not to exceed the power dissipation limits of the LM3448
package or die junction temperature. Please see the LM3448 datasheet for additional details regarding its
thermal specifications.
• Cursor 1: 65.3°C
• Cursor 2: 60.1°C
• Cursor 3: 67.6°C
• Cursor 4: 64.9°C
• Cursor 5: 65.6°C
Figure 19. Top Side - Thermal Scan
7
SNOA559B–October 2011–Revised May 2013 AN-2127 LM3448 A19 Edison Retrofit Evaluation Board
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