NJM2881F28-TE1 Integrated Circuits (ICs)

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NJM2881F28-TE1 is a linear voltage regulator produced by New Japan Radio Co., Ltd. It is used mainly in the field of industrial automation, control devices, and consumer electronics. This regulator is used to maintain constant voltage level despite any changes in input voltage, making it an ideal choice for applications where accuracy and reliability are essential.

The NJM2881F28-TE1 is categorized as a PMIC (Power Management Integrated Circuit) with a linear voltage regulator, specifically a single-output switching regulator with adjustable output voltage and current protection. It is designed to provide the output voltage of 0.6V – 15V with power and current ranges up to 3A and 60W, in order to fit the requirements of different electrical appliances, from home to industry.

The NJM2881F28-TE1 includes several control functions, such as sequence control, current limiting, thermal shutdown, and output start-up control. Here we will focus on exploring the working principles behind this voltage regulator.

The NJM2881F28-TE1 uses two identical transistors for voltage regulation. The source of the two transistors is connected, forming a differential amplifier circuit which works as a comparator. The emitter of the first transistor is connected to a reference voltage. Meanwhile, the emitter of the second transistor is connected to a positive output voltage. The base of each transistor is connected to the control terminal.

When the voltage at the control terminal is equal to the reference voltage, the difference between the two transistors will cause a current to flow from the output. This current will be proportional to the difference between the input and output voltages, which is how the reference voltage is maintained. If the voltage at the control terminal is lower than the reference voltage, current will be pulled from the output; if the voltage is higher, current will be pushed out of the output. In either case, the output voltage will remain at its reference voltage.

The NJM2881F28-TE1 is further equipped with a protection circuit which monitors the current flowing through the circuit and shuts down the circuit in case the current exceeds its limits. This protects the circuit from being damaged by an overload. It also has a thermal protection circuit which will shut down the circuit in case the temperature reaches a dangerous level.

The NJM2881F28-TE1 is a very useful device for maintaining precise voltage levels in applications where accuracy and reliability are essential, such as industrial automation, control devices, and consumer electronics. It has a wide range of adjustable output voltage and current levels, and includes several useful protection circuits for ensuring its safe and proper operation.

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