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LM317H Fiches technique(PDF) 24 Page - Texas Instruments

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No de pièce LM317H
Description  Wide Temperature Three-Pin Adjustable Regulator
Download  48 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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LM317H Fiches technique(HTML) 24 Page - Texas Instruments

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LM317-N
LM317-N
LM317-N
LM117, LM317-N
SNVS774P – MAY 2004 – REVISED OCTOBER 2015
www.ti.com
Typical Applications (continued)
9.2.13 AC Voltage Regulator
In Figure 31, the top regulator is +6 V above the bottom regulator. It is clear that when the input rises above +6 V
plus the dropout voltage, only the top LM317-N regulates +6 V at the output. When the input falls below –6 V
minus the dropout voltage, only the bottom LM317-N regulates –6 V at the output. For regions where the output
is not clipped, there is no regulation taking place, so the output follows the input.
Figure 31. AC Voltage Regulator
9.2.14 12-V Battery Charger
The LM317-N can be used in a battery charger application shown in Figure 32, where the device maintains either
constant voltage or constant current mode depending on the current charge of the battery. To do this, the part
senses the voltage drop across the battery and delivers the maximum charging current necessary to charge the
battery. When the battery charge is low, there exists a voltage drop across the sense resistor RS, providing
constant current to the battery at that instant. As the battery approaches full charge, the potential drop across RS
approaches zero, reducing the current and maintaining the fixed voltage of the battery.
Use of RS allows low charging rates with fully charged battery.
Figure 32. 12-V Battery Charger
24
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Product Folder Links: LM117 LM317-N


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