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Thermal Performance

9 Thermal Performance

The board temperature was measured using an IR camera (HIS-3000, Wahl) while running under the

following conditions: V

= 120V

RMS

, I

LED

= 228mA, # of LEDs = 9, P

OUT

= 6.2W.

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 6W 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 Phase Dimmable Offline LED Driver with

Integrated FET Data Sheet (SNOSB51) for additional details regarding its thermal specifications.

• Cursor 1: 61.5°C

• Cursor 2: 56.2°C

• Cursor 3: 57.7°C

• Cursor 4: 53.8°C

• Cursor 5: 52.9°C

Figure 20. Top Side - Thermal Scan

SNOA554C–October 2011–Revised May 2013 AN-2090 LM3448 -120VAC, 6W Isolated Flyback LED Driver

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