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LM317T 데이터시트(PDF) 28 Page - Texas Instruments

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부품명 LM317T
상세설명  Wide Temperature Three-Pin Adjustable Regulator
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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
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Product Folder Links: LM117 LM317-N


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