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LM317MDCY Arkusz danych(PDF) 9 Page - Texas Instruments |
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LM317MDCY Arkusz danych(HTML) 9 Page - Texas Instruments |
9 / 22 page LM317M C ADJ R 2 Input Output Adjust Vref=1.25V V O D2 1N4002 R 1 240 I ADJ C 0.1 I F V I D1 1N4002 C 1.0 F I LM317M www.ti.com SLVS297P – APRIL 2000 – REVISED MARCH 2014 8 Applications and Implementation 8.1 Application Information The LM317M is a linear voltage regulator. The feedback is the output terminal to adjust terminal differential. The output voltage can be set to any value from 1.25-V to Vout maximum with two resistors. 8.2 Typical Application 8.2.1 Design Requirements For this design example, use the parameters listed in Table 1. Table 1. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage range (Output Voltage + 2.5V) to 37V Output voltage Vref × (1 + R2/R1) + Iadj × R2 8.2.2 Detailed Design Procedure 8.2.2.1 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. 8.2.2.2 Output Capacitor An output capacitor improves transient response, but it not needed for stability. 8.2.2.3 Feedback Resistors The feedback resistor set the output voltage using Equation 2. Vref × (1 + R2/R1) + Iadj × R2 (2) 8.2.2.4 Adjustment Terminal Capacitor The optional adjustment terminal capacitor will improve ripple rejection by preventing the amplification of the ripple. When capacitor is used and VOUT > 6V, a protection diode from adjust to output is recommended. Copyright © 2000–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM317M |
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