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LP38853 bảng dữ liệu(PDF) 17 Page - Texas Instruments

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LP38853 bảng dữ liệu(HTML) 17 Page - Texas Instruments

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LP38853
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SNVS335C – DECEMBER 2006 – REVISED SEPTEMBER 2011
Figure 34. Maximum Power Dissipation vs Ambient Temperature for the DDPAK Package
Figure 34 shows the maximum allowable power dissipation for DDPAK packages for different ambient
temperatures, assuming
θJA is 35°C/W and the maximum junction temperature is 125°C.
Heat-Sinking The SO PowerPAD-8 Package
The LP38853MR package has a
θJA rating of 168°C/W, and a θJC rating of 11°C/W. The θJA rating of 168°C/W
includes the device DAP soldered to an area of 0.008 square inches (0.09 in x 0.09 in) of 1 ounce copper, with
no airflow.
Figure 35.
θJA vs Copper (1 Ounce) Area for the SO PowerPAD-8 Package
Increasing the copper area soldered to the DAP to 1 square inch of 1 ounce copper, using a dog-bone type
layout, will improve the
θJA rating to 98°C/W. Figure 35 shows that increasing the copper area beyond 1 square
inch produces very little improvement.
Copyright © 2006–2011, Texas Instruments Incorporated
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