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LM317LCLPR データシート(PDF) 9 Page - Texas Instruments |
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LM317LCLPR データシート(HTML) 9 Page - Texas Instruments |
9 / 29 page VI VO (V) 0 6.25 12.5 18.75 25 31.25 37.5 42.5 1.2 1.22 1.24 1.26 1.28 1.3 D001 40GC 0GC 25GC 125GC 2 OUT REF ADJ 2 1 R V V 1 (I R ) R æ ö = ´ + + ´ ç ÷ è ø LM317L www.ti.com SLCS144E – JULY 2004 – REVISED OCTOBER 2014 9.2.2.4 Adjustment Terminal Capacitor The optional adjustment pin capacitor will improve ripple rejection by preventing the amplification of the ripple. When capacitor is used and VOUT > 6 V, a protection diode from adjust to output is recommended. 9.2.2.5 Design Options and Parameters Common Linear Regulator designs are concerned with the following parameters: • Input voltage range • Input capacitor range • Output voltage • Output current rating • Output capacitor range • Input short protection • Stability • Ripple rejection 9.2.2.6 Output Voltage VO is calculated as shown in Equation 3. (3) Because IADJ typically is 50 µA, it is negligible in most applications. 9.2.2.7 Ripple Rejection CADJ is used to improve ripple rejection; it prevents amplification of the ripple as the output voltage is adjusted higher. If CADJ is used, it is best to include protection diodes. 9.2.2.8 Input Short Protection If the input is shorted to ground during a fault condition, protection diodes provide measures to prevent the possibility of external capacitors discharging through low-impedance paths in the IC. By providing low-impedance discharge paths for CO and CADJ, respectively, D1 and D2 prevent the capacitors from discharging into the output of the regulator. 9.2.3 Application Curves Figure 2. Adjustment Voltage Relative to Output Over Temperature Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM317L |
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