LM2678-5.0 National Semiconductor, LM2678-5.0 Datasheet - Page 5
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LM2678-5.0
Manufacturer Part Number
LM2678-5.0
Description
SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
Manufacturer
National Semiconductor
Datasheet
1.LM2678-5.0.pdf
(23 pages)
(Continued)
Note 7: Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as the
TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 8: Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area of
the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 9: Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times the
area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in Switchers Made
Simple
®
software.
5
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