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LM317T 데이터시트(PDF) 28 Page - Texas Instruments |
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LM317T 데이터시트(HTML) 28 Page - Texas Instruments |
28 / 48 page LM117, LM317-N SNVS774P – MAY 2004 – REVISED OCTOBER 2015 www.ti.com Layout Example (continued) Figure 37. Layout Example (TO-220) 11.3 Thermal Considerations 11.3.1 Heatsink Requirements The LM317-N regulators have internal thermal shutdown to protect the device from over-heating. Under all operating conditions, the junction temperature of the LM317-N must not exceed the rated maximum junction temperature (TJ) of 150°C for the LM117, or 125°C for the LM317-N. A heatsink may be required depending on the maximum device power dissipation and the maximum ambient temperature of the application. To determine if a heatsink is needed, the power dissipated by the regulator, PD, must be calculate with Equation 3: PD = ((VIN − VOUT) × IL) + (VIN × IG) (3) Figure 38 shows the voltage and currents which are present in the circuit. The next parameter which must be calculated is the maximum allowable temperature rise, TR(MAX) in Equation 4: TR(MAX) = TJ(MAX) − TA(MAX) (4) where TJ(MAX) is the maximum allowable junction temperature (150°C for the LM117, or 125°C for the LM317-N), and TA(MAX) is the maximum ambient temperature that will be encountered in the application. Using the calculated values for TR(MAX) and PD, the maximum allowable value for the junction-to-ambient thermal resistance ( θJA) can be calculated with Equation 5: θJA = (TR(MAX) / PD) (5) 28 Submit Documentation Feedback Copyright © 2004–2015, Texas Instruments Incorporated Product Folder Links: LM117 LM317-N |
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