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LP3892EMR-1.8 Datasheet(PDF) 10 Page - Texas Instruments |
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LP3892EMR-1.8 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page 30 80 130 180 0 0.5 1.5 COPPER AREA (sq. in.) 1 LP3892 SNVS236D – SEPTEMBER 2003 – REVISED APRIL 2013 www.ti.com As shown in the graph below, increasing the copper area beyond 1 square inch produces very little improvement. The minimum value for θJA for the DDPAK/TO-263 package mounted to a PCB is 32°C/W. Figure 22 shows the maximum allowable power dissipation for DDPAK/TO-263 packages for different ambient temperatures, assuming θJA is 35°C/W and the maximum junction temperature is 125°C. Figure 21. Maximum Power Dissipation vs Ambient Temperature for DDPAK/TO-263 Package HEATSINKING SO PowerPAD PACKAGE Heatsinking for the SO PowerPAD-8 package is accomplished by allowing heat to flow through the ground slug on the bottom of the package into the copper on the PC board. The heat slug must be soldered down to a copper plane to get good heat transfer. It can also be connected through vias to internal copper planes. Since the heat slug is at ground potential, traces must not be routed under it which are not at ground potential. Under all possible conditions, the junction temperature must be within the range specified under operating conditions. Figure 22 shows a curve for the θJA of the SO PowerPAD package for different copper area sizes using a typical PCB with one ounce copper in still air. Figure 22. θJA vs Copper (1 ounce) Area for SO PowerPAD Package 10 Submit Documentation Feedback Copyright © 2003–2013, Texas Instruments Incorporated Product Folder Links: LP3892 |
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