NJM78L12A

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NJM78L12A is a three-terminal linear adjustable voltage regulator that utilizes the voltage-regulating element, the NJM78L12A and advanced BiCMOS Process to ensure high reliability. This device is capable of providing a variable output voltage within a wide range of 3.0 to 40V. The NJM78L12A is intended for use as a constant voltage regulator, ripple filter, fed by an AC power or a battery and supply. It was developed primarily for use as a low-voltage regulator in personal server systems, desktop, laptop and notebook computers, or typical consumer appliances.

The NJM78L12A is particularly useful for bipolar applications where it has superior performance in noise reduction, output accuracy and line regulation. It offers various functions, including low output noise, reverse current protection, upward thermal resistance and fast start-up safe operating area functionality. The device also features protection circuitry which automatically shuts down the internal circuits in case of overheating.

Working principle

The NJM78L12A linear adjustable voltage regulator is designed to provide a steady output current with only a minimal input-voltage variation. Its purpose is to internally regulate the output voltage from a constant voltage source or from a battery. The regulator incorporates a voltage-regulating element known as a voltage reference. This reference has a nominal 2.5 volts output. The NJM78L12A requires an input voltage between 5 and 40V in order to operate, and its output is adjustable between 3.0 and 40V. In order to control the output voltage, a feedback line, or control pin, must be connected between the regulator and the output voltage, as well as the reference voltage. This feedback pin produces a voltage proportional to the output voltage, which is then compared to the reference and adjusted until they match.

The device then modulates the amount of current passing through the pass element (the device\'s load) to ensure the output voltage remains constant. This is done by the use of a control element connected between the reference and the pass elements. This control element acts as a variable resistor and regulates the voltage passing through the pass element according to the voltage sent from the control pin. This process is known as regulation and it allows the NJM78L12A regulator to maintain the output voltage at a constant value, regardless of input voltage variations.

Application Field

The NJM78L12A is widely used in personal server systems, desktop and laptop computers, as well as typical consumer appliances. It is also extensively applied in industrial applications such as medical and scientific instruments, data storage systems, telecom, power supplies and automotive applications.

The device shows exceptional performance in maintaining output voltage accuracy, low output noise and line regulation. With its reverse current protection, high efficiency and fast start-up safe operating area functionality, it is highly beneficial for all the above applications.

The NJM78L12A comes in a very compact, 3-pin, surface-mount package, reducing size and cost of the arrangement. With its comprehensive features, it provides designers with optimum results at a minimum cost. Therefore, the device is ideal choice when a fast and accurate voltage regulator is required.

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