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LM7805 Datasheet(PDF) 14 Page - Texas Instruments |
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LM7805 Datasheet(HTML) 14 Page - Texas Instruments |
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14 / 33 page  14 LM340, LM340A, LM7805, LM7812, LM7815 SNOSBT0K – FEBRUARY 2000 – REVISED JULY 2016 www.ti.com Product Folder Links: LM340 LM340A LM7805 LM7812 LM7815 Submit Documentation Feedback Copyright © 2000–2016, Texas Instruments Incorporated Application Information (continued) Figure 16. Regulator Floating Ground Figure 17. Transients When a value for θ(H–A) is found, a heat sink must be selected that has a value that is less than or equal to this number. θ(H–A) is specified numerically by the heat sink manufacturer in this catalog or shown in a curve that plots temperature rise vs power dissipation for the heat sink. 8.2 Typical Applications 8.2.1 Fixed Output Voltage Regulator The LM340x and LM78xx devices are primarily designed to provide fixed output voltage regulation. The simplest implementation of LM340x and LM78xx is shown in Figure 18. *Required if the regulator is located far from the power supply filter. **Although no output capacitor is needed for stability, it does help transient response. (If needed, use 0.1-μF, ceramic disc). Figure 18. Fixed Output Voltage Regulator 8.2.1.1 Design Requirements The device component count is very minimal. Although not required, TI recommends employing bypass capacitors at the output for optimum stability and transient response. These capacitors must be placed as close as possible to the regulator. If the device is located more than 6 inches from the power supply filter, it is required to employ input capacitor. |
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