MC78L15ABP

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MC78L15ABP: Application Field and Working Principle

The MC78L15ABP is a monolithic voltage regulator manufactured by National Semiconductor Corporation and is part of its Linear Voltage Regulator family for PMIC (Power Management). A Linear Voltage Regulator (LVR) is typically used to convert high voltages into the required levels in the range of 1.5 – 5 volts. It is available in an 8-pin dual-in-line package with 500 mA output.

Application Field

The MC78L15ABP LVR is mainly used in wide variety of applications where a regulated output voltage is needed. It can be utilized in a range of mobile applications such as cellular phones, pagers and LCD screens. It can also be used in industrial applications such as computers, TV, radios, general electronics devices. Other applications where MC78L15ABP LVR is used include pricing machines, power tools and remote control devices.

Working Principle

An internal Positive Temperature Coefficient (PTC) controls the turn-on process as well as its output voltage. The MC78L15ABP LVR is enabled by a logic low. The voltage is first supplied to the input pin, then flows through the either diode D1 or D2 resulting in current flowing through the regulator, which is held for a set amount of time by the PTC. The output voltage is then produced.

The set of the output voltage is determined by the value of the external components while the internal output voltage is preset by internal resistor divider. This way, the user can control the output voltage of the regulator. The MC78L15ABP LVR also has other features such as short-circuit protection, thermal overload protection and over-current protection.

Conclusion

The MC78L15ABP LVR is a reliable voltage regulator manufactured by National Semiconductor Corporation for a wide range of applications. It works on the principle of converting high voltages into the required levels of 1.5 – 5 volts by using an internal Positive Temperature Coefficient (PTC) to control its output voltage. It also has several features such as short-circuit protection, thermal overload protection and over-current protection. This makes it a great choice for mobile, industrial and general applications.

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