L7906CD2T-TR Integrated Circuits (ICs)

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The L7906CD2T-TR is a low drop three-terminal voltage regulator that is part of the PMIC – Voltage Regulators – Linear category of Electronic devices. It is designed to supply a regulated output voltage of either 6V (+ 0.2V) or 3V (+ 0.2V), depending on the exact part number. In order to provide a selection from the variety of L7906CD2T-TR devices, this report outlines their applications, working principles, and provides some notes on their requirements and limitations.

Applications
The L7906CD2T-TR series of voltage regulators is designed for applications requiring an adequate output voltage for supplying circuits with current levels anywhere from several milliamps up to an absolute maximum of 1.5A. This is especially useful for low-power devices and applications, such as those found in automotive electronics, consumer devices, personal computers, instrumentation and medical equipment.

Typical applications include voltage stabilization, input and output voltage scaling, and output current limiting. They are also particularly suitable for power conversion and shunt regulation circuits, because of their adjustable output voltage, current limiting and thermal protection features.

Working Principle
The L7906CD2T-TR series of voltage regulators are based on the linear regulator topology which consists of three basic components: an input voltage source, an adjustable output voltage gain section and a feedback loop. These components can be further divided into two stages: a series pass transistor and a shunt regulator. The series pass transistor is responsible for regulating and limiting the input voltage, while the shunt regulator ensures that the output voltage stays within specification, regardless of changes in the voltage supply or the output current load.

The feedback loop is implemented using a comparator that compares the output voltage of the regulator to a reference voltage and adjusts the gain of the series pass transistor to maintain a constant voltage level at the output. The series pass transistor also acts as a current limiter for the circuit, ensuring that it does not draw more current than its rated maximum.

The overall working principle of the L7906CD2T-TR series of voltage regulators can be summarized as follows: the regulator takes an input voltage, applies a precision reference voltage to the feedback loop, adjusts the gain of the series pass transistor to deliver a regulated output voltage, and limits the current drawn from the circuit.

Requirements and Limitations
The L7906CD2T-TR series of voltage regulators require an input voltage range of3.3 to 15V. The output voltage range is either 6V or 3V, depending on the specific device. The temperature range specified for operation is -40°C to 125°C. The maximum output current specified is 1.5A.

These regulators should be protected against over-voltage and electrostatic discharge, as their output accuracy is sensitive to these types of external factors. Care should also be taken to ensure the proper series pass transistor gain is set, due to the fact that the feedback loop can be disrupted or disabled if not calibrated correctly.

Finally, the L7906CD2T-TR series of voltage regulators should be used within their specified temperature and voltage limits, otherwise their performance and output accuracy may suffer.

The L7906CD2T-TR is a versatile, low drop set of voltage regulators ideal for low-power applications. With its adjustable output voltage, current limitation, and robust protection features, it can be used in a variety of situations where reliable output voltage is required.

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