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LM317AT 数据表(PDF) 11 Page - Texas Instruments |
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LM317AT 数据表(HTML) 11 Page - Texas Instruments |
11 / 40 page LM117, LM317A, LM317-N www.ti.com SNVS774O – MAY 2004 – REVISED JANUARY 2014 Figure 23. Regulator with Line Resistance in Output Lead With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two separate leads to the case. However, with the TO-39 package, care should be taken to minimize the wire length of the output lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. Protection Diodes When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Most 10 μF capacitors have low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is enough energy to damage parts of the IC. When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regulator, and the rate of decrease of VIN. In the LM117, this discharge path is through a large junction that is able to sustain 15A surge with no problem. This is not true of other types of positive regulators. For output capacitors of 25 μF or less, there is no need to use diodes. The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs when either the input, or the output, is shorted. Internal to the LM117 is a 50 Ω resistor which limits the peak discharge current. No protection is needed for output voltages of 25V or less and 10 μF capacitance. Figure 24 shows an LM117 with protection diodes included for use with outputs greater than 25V and high values of output capacitance. D1 protects against C1 D2 protects against C2 Figure 24. Regulator with Protection Diodes Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM117 LM317A LM317-N |
类似零件编号 - LM317AT |
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类似说明 - LM317AT |
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