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LM317 データシート(PDF) 10 Page - Texas Instruments

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部品番号 LM317
部品情報  3-Terminal Adjustable Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM317
R1
240 W
IAdj
R2
Adjust
Ci
0.1 µF
CO
1.0 µF
VI
VO
Output
Input
Vref = 1.25 V
D1
1N4002
D2
1N4002
CADJ
LM317
SLVS044W – SEPTEMBER 1997 – 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 flexibility of the LM317 allows it to be configured to take on many different functions in DC power
applications.
9.2 Typical Application
Figure 9. Adjustable Voltage Regulator
9.2.1 Design Requirements
R1 and R2 are required to set the output voltage.
CADJ is recommended to improve ripple rejection. It prevents amplification of the ripple as the output voltage
is adjusted higher.
Ci is recommended, particularly if the regulator is not in close proximity to the power-supply filter capacitors. A
0.1-µF disc or 1-µF tantalum capacitor provides sufficient bypassing for most applications, especially when
adjustment and output capacitors are used.
CO improves transient response, but is not needed for stability.
Protection diode D2 is recommended if CADJ is used. The diode provides a low-impedance discharge path to
prevent the capacitor from discharging into the output of the regulator.
Protection diode D1 is recommended if CO is used. The diode provides a low-impedance discharge path to
prevent the capacitor from discharging into the output of the regulator.
9.2.2 Detailed Design Procedure
VO is calculated as shown in Equation 1. IADJ is typically 50 µA and negligible in most applications.
VO = VREF (1 + R2 / R1) + (IADJ × R2)
(1)
10
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