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MC78L15ABP Datasheet(PDF) 8 Page - ON Semiconductor |
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MC78L15ABP Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 16 page  MC78L00A Series, NCV78L00A http://onsemi.com 8 APPLICATIONS INFORMATION Design Considerations The MC78L00A Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition. Internal Short Circuit Protection 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 lengths, or if the output load capacitance is large. The 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 regulators input terminals. 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 9. Current Regulator Figure 10. ± 15 V Tracking Voltage Regulator The MC78L00 regulators can also be used as a current source when connected as above. In order to minimize dissipation the MC78L05C is chosen in this application. Resistor R determines the current as follows: For example, a 100 mA current source would require R to be a 50 W, 1/2 W resistor and the output voltage compliance would be the input voltage less 7 V. IO = 5.0 V + IB IIB = 3.8 mA over line and load changes Input 0.33 mF R IO MC78L05A Constant Current to Grounded Load − + MC1741 +20V 0.33 mF MC78L15A +VO 10k 10k −VO 7 6 2 3 4 6.5 20V MPS A70 MPS U55 0.33 mF 0.33 mF +VI −VI MC78LXXA MC79LXXA +VO −VO 0.33 mF 0.1 mF 0.1 mF R Figure 11. Positive and Negative Regulator |
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