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LM317LIDG4 Datenblatt(PDF) 8 Page - Texas Instruments

Teilenummer LM317LIDG4
Bauteilbeschribung  3-Terminal Adjustable Regulator
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C1 = 0.1 µF
VI
470 W
R1
R2
C2 = 1 µF
VO
Adjustment
Output
Input
LM317L
LM317L
SLCS144E – JULY 2004 – REVISED OCTOBER 2014
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The two output resistors are the only components required to adjust VOUT.
9.2 Typical Application
9.2.1 Design Requirements
1. Use of an input bypass capacitor is recommended if regulator is far from the filter capacitors.
2. For this design example, use the parameters listed in Table 1.
3. Use of an output capacitor improves transient response, but is optional.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input voltage range
(Output Voltage + 2.5 V) to 32 V
Output voltage
VREF × (1 + R2 / R1) + IADJ × R2
9.2.2 Detailed Design Procedure
9.2.2.1 Input Capacitor
An input capacitor is not required, but it is recommended, particularly if the regulator is not in close proximity to
the power-supply filter capacitors. A 0.1-µF ceramic or 1-µF tantalum provides sufficient bypassing for most
applications, especially when adjustment and output capacitors are used.
9.2.2.2 Output Capacitor
An output capacitor improves transient response, but it not needed for stability.
9.2.2.3 Feedback Resistors
The feedback resistor set the output voltage using Equation 2.
VREF × (1 + R2 / R1) + IADJ × R2
(2)
8
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Product Folder Links: LM317L


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