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LM317MDCYR データシート(PDF) 10 Page - Texas Instruments |
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LM317MDCYR データシート(HTML) 10 Page - Texas Instruments |
10 / 22 page −10 Time − µs −0.2 −5 0 5 10 15 20 25 30 35 −0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 −4.0 −3.0 −2.0 −1.0 0 1.0 2.0 3.0 4.0 5.0 VI = 15 V VO = 10 V IL = 50 mA ∆IL = +500 mA CL = 1 µF CADJ = 10 µF CL = 0 µF CADJ = 0 µF −1.0 Time − µs −0.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 1.2 1 0.8 0.6 0.4 0.2 0 −1 −0.8 −0.6 −0.4 −0.2 0 0.2 0.4 0.6 0.8 1 VO = 10 V VI = 15 V, ∆VI = +1 V IL = 50 mA TJ = 25°C CL = 0 µF CADJ = 0 µF ) ( ) 1 ( 2 1 2 R I R R V V adj ref o u u LM317M SLVS297P – APRIL 2000 – REVISED MARCH 2014 www.ti.com 8.2.2.5 Protection Diodes If the input is shorted to ground during a fault condition, protection diode (D1) prevents discharge through the LM317M. If the output is shorted to ground during a fault condition, protection diode (D2) prevents adjust terminal capacitor discharge through the LM317M. 8.2.2.6 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 8.2.2.7 Output Voltage Vo is calculated as shown: (3) Because Iadj typically is 50-µA, it is negligible in most applications. 8.2.2.8 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. 8.2.2.9 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. 8.2.3 Application Curves Figure 12. Line Transient Response vs Time Figure 13. Load Transient Response vs Time 10 Submit Documentation Feedback Copyright © 2000–2014, Texas Instruments Incorporated Product Folder Links: LM317M |
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