C1 = 0.1 µF

470 W

R1

R2

C2 = 1 µF

Adjustment

Output

Input

LM317L

LM317L

SLCS144E – JULY 2004 – REVISED OCTOBER 2014

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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

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

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.

(2)

8

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