L4931CDT120-TR

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The L4931CDT120-TR is a positive voltage regulator IC, belonging to PMIC (Power Management ICs)’s Voltage Regulators’s Linear family. It is designed to provide a constant voltage output of 1.2V at currents up to 120mA, accurately controlling the output voltage even when the input voltage varies from 4.7V to 20V.

The device is intended to be used in applications such as battery-powered equipment, digital communications equipment, consumer electronics, automotive systems which require low noise, low ripple and low dropout linear regulator. It offers an output noise of 20 µV RMS (20 Hz to 20 kHz) and a very low output current of 5mA. The device features over voltage protection, current limiting, adjustable input voltage, and adjustable output voltage.

The functional block diagram of L4931CDT120-TR is made up of two transistors, a diode and two resistors. The two transistors act as switches, and the diode is used to protect the device from over-current and over-voltage conditions. The two resistors are used to adjust the input voltage and output voltage of the device.

The working principle of L4931CDT120-TR should be viewed in two separate parts: the error amplifier and the pass transistor. The error amplifier measures the output voltage and compares it to a reference voltage. If the output voltage is too low, the pass transistor is turned on which allows current to flow from the input to the output. If the output voltage is too high, the pass transistor is turned off and no current is allowed to flow from the input to the output.

The output voltage of the device can be measured with a multimeter. The measured voltage should be within the specified range of 0.6V to 1.2V. If the measured output voltage is outside of the specified range, then the device may be defective and needs to be replaced with a new one.

The L4931CDT120-TR is a high-performance, low-dropout linear regulator and is an ideal solution for applications which require a stable voltage output. It is capable of controlling the output voltage accurately even when the input voltage varies from 4.7V to 20V. The device is equipped with over-voltage protection, current limiting and adjustable input and output voltages, making it suitable for various applications. With its exceptionally low noise and low ripple, the L4931CDT120-TR is an excellent choice for battery-powered equipment, digital communication equipment and other high performance, low power applications.

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