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LM317-N-MIL 데이터시트(PDF) 13 Page - Texas Instruments

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부품명 LM317-N-MIL
상세설명  Wide Temperature Three-Pin Adjustable Regulator
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제조업체  TI1 [Texas Instruments]
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LM317-N-MIL
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SNVSAY0 – JUNE 2017
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Copyright © 2017, Texas Instruments Incorporated
Device Functional Modes (continued)
7.4.2 Protection Diodes
When external capacitors are used with any IC regulator, it is sometimes necessary to add protection diodes to
prevent the capacitors from discharging through low current points into the regulator. Most 10-μF capacitors have
low enough internal series resistance to deliver 20-A spikes when shorted. Although the surge is short, there is
enough energy to damage parts of the IC.
When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge
into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage
of the regulator, and the rate of decrease of VIN. In the LM317-N-MIL, this discharge path is through a large
junction that is able to sustain 15-A surge with no problem. This is not true of other types of positive regulators.
For output capacitors of 25 μF or less, there is no need to use diodes.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input, or the output, is shorted. Internal to the LM317-N-MIL is a 50-Ω resistor which limits the
peak discharge current. No protection is needed for output voltages of 25 V or less and 10-μF capacitance.
Figure 17 shows an LM317-N-MIL with protection diodes included for use with outputs greater than 25 V and
high values of output capacitance.
D1 protects against C1
D2 protects against C2
Figure 17. Regulator With Protection Diodes


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