MC79L15ABPRP

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The MC79L15ABPRP Voltage Regulators by ON Semiconductor are optimized NPN pass elements, employed as a series voltage regulator in on-board applications. This device, a linear voltage regulator, provides functionality with the full protection of short circuit current limiting, thermal overload protection, and safe operating area protection. The device, available in TO-92-3 package, is useful in applications operating at up to 12V.

This specific device, the MC79L15ABPRP is available with adjustable output voltage which can range between 3V to 12V. The working current of the device depends upon the value of resistors connected to the output terminal. To eliminate the effects of possible thermal runaway and to increase the overall performance of the device, it employs an external sense terminal i.e., the output voltage can be sensed at some distance with the help of a connected series resistor.

The output impedance of the device is more than 10 ohms and it has high electrical noise immunity. The saturation voltage of the output emitter is no more than a few milli volts and the transfer current gain is more than 100. The output noise voltage is maximum 20 mV and is remarkably low.

The device comes with a wide input voltage range of 7V to 40V, so that it can be used in both symmetric and asymmetric supply systems. It is capable of providing an output current of 150 mA and is operated with a stability of 0.3 V/V. It is especially useful for battery-operated equipment and other applications driven by unregulated power sources.

In terms of application areas, the MC79L15ABPRP linear voltage regulator is suitable for use in applications like radio and TV receivers, office machines, safety systems, multimeters, and production testing equipment. Further, it can be used in dimmer control circuits, military equipment, ignition systems, and electronic toys.

The working principle of the linear voltage regulator is based on the idea of comparing the input voltage with a reference voltage. The comparator then compares both the voltages and decides the output accordingly. The output voltage is adjusted by the voltage divider connected to the output pin. If the output voltage is higher than expected, then the output voltage is reduced by making adjustments to the resistance values. On the other hand, if the output voltage is too low, then the voltage divider is used to increase the output voltage.

The MC79L15ABPRP voltage regulator also comes with protection circuits for safe operation in all sorts of applications. The over-temperature protection feature prevents the device from any damage due to excessive temperature. It also has input protection diodes and junctions which protect the device from any externally induced spikes in the input voltage.

The overall performance of the MC79L15ABPRP is heavily dependent upon the design of the voltage divider network employed. To ensure utmost efficiency, special attention must be paid to the electrical connections and the selection of components in the voltage dividers. It is advisable to use a wide range of components, including precision resistors, in order to accurately match the output voltage with the input voltage.

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