UP0421300L Discrete Semiconductor Products

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The UP0421300L is a pre-biased type of transistor array, belonging to the Bipolar Junction Transistor (BJT) family. It is a fully integrated, high-current NPN dc-motor controller which combines the functions of pre-biased resistor, load switch, output amplifier, and current mirror. This article will discuss the application field and working principle of the device.

Application Field

The UP0421300L is suitable for controlling long time continuous current for dc-motors. It is most commonly used for low voltage motor control applications such as auto door openers, home appliances, lift systems and other small electronic vehicles. Its low cost and wide operating range make it an attractive choice for these applications. It is also capable of operating in a frequency range of up to 500 kHz, making it suitable for a variety of applications.

Working Principle

The UP0421300L pre-biased resistor is a semiconductor device that operates as a constant current source. It consists of a P-type metal-oxide-semiconductor (PMOS) transistor, an N-type metal-oxide-semiconductor (NMOS) transistor, and an inductor. The PMOS transistor is used to drive the first current leg, and the NMOS transistor is used to drive the second current leg. These transistors are used to create the required voltage-to-current ratio for the dc motor. The inductor is used to store energy, which is then dissipated as heat. The leakage current is naturally minimized by this type of current source.

The UP0421300L also incorporates a load switch and an output amplifier. The load switch is used to control the amount of current drawn by the motor through a voltage secondary feedback loop. This allows the UP0421300L to precisely regulate the current flow to the motor while also providing electrical isolation from the load. The output amplifier is used to amplify the output voltage. This allows the UP0421300L to efficiently drive the motor at any given current level.

Finally, the UP0421300L also contains a current mirror. The current mirror is used to match the input and output currents of the device. This is done by arranging a pair of bipolar transistors side-by-side. The base of the first transistor is connected to the base of the second transistor and the emitters are connected to each other. This allows the second transistor to mirror the current of the first transistor, thus providing a precise current match between the input and output.

In summary, the UP0421300L is a pre-biased, high current NPN dc-motor controller that combines the functions of pre-biased resistor, load switch, output amplifier, and current mirror. This device is widely used in a variety of applications, such as auto door openers, home appliances, lift systems, and other small electronic vehicles. The UP0421300L provides precise current control and electrical isolation between the load and the motor.

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