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LP38512TSX Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LP38512TSX Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 14 page  20183034 FIGURE 2. ERROR Flag Operation, biased from V IN POWER DISSIPATION/HEATSINKING A heatsink may be required depending on the maximum pow- er dissipation (P D(MAX)), maximum ambient temperature (T A(MAX)) of the application, and the thermal resistance (θJA) of the package. Under all possible conditions, the junction temperature (T J) must be within the range specified in the Operating Ratings. The total power dissipation of the device is given by: P D = ( (VIN−VOUT) x IOUT) + (VIN x IGND) (1) where I GND is the operating ground current of the device (specified under Electrical Characteristics). The maximum allowable junction temperature rise ( ΔT J) de- pends on the maximum expected ambient temperature (T A (MAX)) of the application, and the maximum allowable junction temperature (T J(MAX)): ΔT J = TJ(MAX)− TA(MAX) (2) The maximum allowable value for junction to ambient Ther- mal Resistance, θ JA, can be calculated using the formula: θ JA = ΔTJ / PD(MAX) (3) HEATSINKING TO-263 PACKAGE The TO-263 and the TO-263 THIN packages use the copper plane on the PCB as a heatsink. The tab, or DAP, of these packages are soldered to the copper plane for heat sinking. Figure 3 shows a curve for the θ JA of TO-263 package for different copper area sizes, using a typical PCB with 1 ounce copper and no solder mask over the copper area for heat sinking. 20183035 FIGURE 3. θ JA vs Copper (1 Ounce) Area for TO-263 package As shown in the figure, increasing the copper area beyond 1 square inch produces very little improvement. The minimum value for θ JA for the TO-263 package mounted to a two-layer PCB is 32°C/W. Figure 4 shows the maximum allowable power dissipation for TO-263 packages for different ambient temperatures, assum- ing θ JA is 35°C/W and the maximum junction temperature is 125°C. 20183036 FIGURE 4. Maximum Power Dissipation vs Ambient Temperature for TO-263 Package 11 www.national.com |
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