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LM337-N Folha de dados(PDF) 9 Page - Texas Instruments |
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LM337-N Folha de dados(HTML) 9 Page - Texas Instruments |
9 / 20 page 9 LM337-N-MIL www.ti.com SNVSAX3 – JUNE 2017 Product Folder Links: LM337-N-MIL Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.4 Device Functional Modes 7.4.1 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 20-A 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 negative output regulator and the input is shorted, the output capacitor pulls current out of the output of the regulator. The current depends on the value of the capacitor, the output voltage of the regulator, and the rate at which VIN is shorted to ground. 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. Figure 13 shows the placement of the protection diodes. *When CL is larger than 20 μF, D1 protects the LM1337-N-MIL in case the input supply is shorted **When C2 is larger than 10 μF and −VOUT is larger than −25V, D2 protects the LM1337-N-MIL in case the output is shorted Figure 13. Regulator With Protection Diodes |
Nº de peça semelhante - LM337-N |
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Descrição semelhante - LM337-N |
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