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LM317L-N Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte LM317L-N
Spiegazioni elettronici  3-Terminal Adjustable Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM317L-N
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SNVS775K – MARCH 2000 – REVISED APRIL 2016
Product Folder Links: LM317L-N
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Copyright © 2000–2016, Texas Instruments Incorporated
Device Functional Modes (continued)
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 LM317L-N, this discharge path is through a large junction
that is able to sustain a 2-A surge with no problem. This is not true of other types of positive regulators. For
output capacitors of 25
μF or less, the ballast resistors and output structure of the LM317L-N limit the peak
current to a low enough level so that there is no need to use a protection diode.
The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs
when either the input or output is shorted. Internal to the LM317L-N 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 15
shows an LM317L-N 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 15. Regulator With Protection Diodes
7.4.3 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 LM317L-N, 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 LM317L-N 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 16
shows an LM317L-N with protection diodes included for use with outputs greater than 25 V and high values of
output capacitance.


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