UA78L09ACD

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PMIC – Voltage Regulators – Linear

UA78L09ACD is a current regulator type voltage regulator. This device is designed for applications requiring tight regulation and low noise. UA78L09ACD fits the need for low-noise, low-dropout voltage regulation for many types of applications.

UA78L09ACD is a linear voltage regulator with a dropout voltage around 0.8V. It is also based on a bi-polar transistor architecture (BJT) which provides output voltages ranging from 2.7 V to 5 V, with specialist versions capable of up to 50 V. It is a cost effective and popular option for TO-220 package.

UA78L09ACD is a single positive voltage regulator, which can deliver up to 1A of current. Input voltage range can be up to 30 V, allowing efficient regulation for multiple applications. Additional features include an on-board current limit, thermal shutdown, reverse polarity protection and soft start.

This device is also easily configurable, with an adjustable output voltage, as well as an overvoltage and reverse current protection. This makes it an ideal choice for any application requiring tightly regulated voltages.

The output voltage can be adjusted by the voltage divider resistors R1 and R2, since the output voltage is determined by the voltage divider resistors. The output voltage can be accurately regulated by changing the ratio of R1 and R2.

At the heart of the UA78L09ACD is an operational amplifier with negative feedback. The amplifier is wired in such a way that it provides feedback to its own output, and any small change in the polarity of the voltage at the output is opposed by the amplifier. An internal voltage divider sets the voltage reference level, and the output voltage is determined by the feedback provided by the amplifier.

Additionally, an error amplifier is included in the circuit which compares the output voltage of the regulator to the reference voltage. This helps to keep the output voltage regulated regardless of load changes and temperature fluctuations.

The UA78L09ACD is widely used in consumer electronics, medical devices, automotive equipment, and telecom applications. It is reliable, widely available, and easy to work with, making it an ideal solution for many power regulation applications.

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