UC382TDTR-ADJ

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UC382TDTR-ADJ Application Field and Working Principle

UC382TDTR-ADJ is an adjustable linear voltage regulator designed for use in applications ranging from consumer electronics to automotive systems. It is a three-terminal voltage regulator that can be used to regulate the output voltage of an input voltage source to a fixed-value regulated output. It dissipates a relatively low amount of power, making it highly efficient and suitable for use in portable devices where power consumption is a concern. The output voltage is adjustable by an external resistor divider and is specified over a wide operating temperature range.

UC382TDTR-ADJ is a non-inverting regulator with an output voltage range of 1.5 V to 14.5 V, depending on the supply voltage and operating temperature range. The regulator maintains a fixed output voltage within the specified operating conditions even with large variations in the input voltage and load current. It features a low dropout voltage (the difference between the input and output voltages) and is capable of efficiently regulating the output in an input voltage range of down to 2 V above the desired output voltage. The UC382TDTR-ADJ operates over a wide temperature range with a typical efficiency of 90%.

Working Principle

At its core, a linear voltage regulator works by controlling the amount of current drawn from the output voltage source. By varying the current flowing through the regulator, the output voltage can be adjusted. The output voltage (Vout) is regulated by a control voltage (Vcontrol). The transistor’s base voltage Vb is connected to the output of a reference voltage source (Vref) and its collector voltage Vc is connected to the output pin of the regulator. The amount of current passing through the transistor is directly proportional to the Vcontrol voltage. The output voltage is related to the Vref voltage and the current through the transistor, as follows:

Vout = Vref + (Vcontrol x I)

In the UC382TDTR-ADJ, an adjustable linear voltage regulator, an external resistor-divider network sets the control voltage Vcontrol. The resistor-divider network consists of two resistors, R1 and R2, connected to the regulator’s adjust pin and ground, respectively. An external resistor-divider network adjusts the control voltage Vcontrol to the desired output voltage level, as follows:

Vcontrol = (Vout x R1) / (R1 + R2)

The resistor values are selected to provide the desired output voltage level. This arrangement allows the output voltage to be set to a reliable value over a wide range of operating conditions and supply voltages.

In addition to regulating the output voltage, the UC382TDTR-ADJ also offers a number of features to protect the regulator from over-current and over-temperature situations. It is equipped with a built-in protection circuit that will shut down the output and indicate an error condition if either of these two situations occur. It also features built-in foldback current limiting, which will limit the output current and reduce the risk of destructive blow-out in the event of an output overload.

In summary, the UC382TDTR-ADJ is an adjustable linear voltage regulator designed for use in applications ranging from consumer electronics to automotive systems. It offers a wide output voltage range, low dropout voltage, and efficient operation over a wide range of operating conditions. It also features built-in protection circuits to protect against over-current and over-temperature situations. The resistor-divider network allows the output voltage to be finely tuned to the desired value.

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