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MC79L12ACDR2G Scheda tecnica(PDF) 5 Page - ON Semiconductor |
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MC79L12ACDR2G Scheda tecnica(HTML) 5 Page - ON Semiconductor |
5 / 11 page MC79L00A Series http://onsemi.com 5 APPLICATIONS INFORMATION Design Considerations The MC79L00A Series of fixed voltage regulators are designed with Thermal Overload Protections that shuts down the circuit when subjected to an excessive power overload condition, Internal Short Circuit Protection that limits the maximum current the circuit will pass. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire length, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high−frequency characteristics to insure stable operation under all load conditions. A 0.33 mF or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulator’s input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. Bypassing the output is also recommended. Figure 2. Positive and Negative Regulator Figure 3. Standard Application +Vin +VO 0.1 mF -Vin -VO 0.33 mF MC78LXX MC79LXX 0.1 mF 0.33 mF Input Output CO** 0.1 mF CI* 0.33 mF MC79LXX A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V above the output voltage even during the low point on the ripple voltage. * CI is required if regulator is located an appreciable * distance from the power supply filter ** CO improves stability and transient response. |
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