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LM317KCE3 데이터시트(PDF) 10 Page - Texas Instruments |
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LM317KCE3 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 32 page 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 Submit Documentation Feedback Copyright © 1997–2014, Texas Instruments Incorporated Product Folder Links: LM317 |
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