![]() ![]() ![]() In addition, the difference between input and output voltages (V in– V out), callec the dropout voltage, must be typically 20 V, even during the low point on the input ripple voltage. These limitations are mentioned in the manufacturer’s specification sheet. While the input voltage may vary over some permissible voltage range, and the output load may vary over some acceptable range, the output voltage remains constant within specified voltage variation limits. The third pin (GND terminal) of the IC is connected to ground. The pin 2 (OUT terminal) of the IC provides a regulated + 15 V which is filtered by capacitor C 2 (mostly for any high frequency noise). An unregulated, input voltage V in is filtered by capacitor C, and connected to the pin. Figure illustrates how one such IC, a 7815, is connected to provide voltage regulation with output of + 15 V dc from this unit. These ICs also have internal thermal overload protection and internal short-circuit current limiting. Although these devices do not require any external component, such components can be employed for providing adjustable voltages and currents. These ICs are designed as fixed voltage regulators and with adequate heat sinking can deliver output currents in excess of 1 A. The series 7800 regulators provide eight voltage options, ranging from 5 to 24 V. ![]()
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