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LM2991SX Arkusz danych(PDF) 6 Page - Texas Instruments |
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LM2991SX Arkusz danych(HTML) 6 Page - Texas Instruments |
6 / 19 page LM2991 SNVS099H – MAY 1999 – REVISED JUNE 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Adjust Pin Current Low Voltage Behavior Figure 15. Figure 16. Maximum Power Maximum Power Dissipation Dissipation (TO-220) (DDPAK/TO-263)(1) Figure 17. Figure 18. (1) The maximum allowable power dissipation is a function of the maximum operating junction temperature (TJ(MAX)), the thermal resistance of the package ( θJA), and the ambient temperature (TA). The maximum allowable power dissipation is: PD = (TJ(MAX) − TA)/θJA, where TJ(MAX) is 125°C, and TA is the maximum expected ambient temperature. If this dissipation is exceeded, the die temperature will rise above 125°C. Excessive power dissipation will cause the LM2991 to go into thermal shutdown (See Thermal Shutdown). For the LM2991, the junction-to-ambient thermal resistance is 53°C/W for the TO-220, 73°C/W for the DDPAK/TO-263, and junction-to-case thermal resistance is 3°C/W. If the DDPAK/TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area, θJA is 50°C/W; with 1 square inch of copper area, θJA is 37°C/W; and with 1.6 or more square inches of copper area, θJA is 32°C/W. 6 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: LM2991 |
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