UA78L09ACDRE4

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PMIC - Voltage Regulators - Linear

UA78L09ACDRE4 Application Field and Working Principle

The UA78L09ACDRE4 is a voltage regulator and part of the Texas Instruments linear voltage regulators family. It features a high-current output of 1A, with a low quiescent current. The output voltage can be regulated to 9V, making it suitable for battery power supplies. Housed in the SOT-223-3 package, the UA78L09ACDRE4 is a three-terminal device, with two input pin connections and a ground connection. The UA78L09ACDRE4 provides reliability and performance in a variety of devices which require regulated power.

The UA78L09ACDRE4 is used in applications as diverse as automotive electronics and telecom systems. It is suitable for applications which require a low quiescent current but still require high-current outputs. It supports a load regulation of 0.3% and line regulation of 0.02%. This makes it an ideal choice for critical applications like computers, portable medical devices, and battery-backed systems, where accuracy is key. It has excellent thermal stability, helping ensure no thermal shutdown occurs under heavy load settings.

The UA78L09ACDRE4 working principle makes it suitable for a range of applications. It is a linear voltage regulator, which means it outputs a steady voltage through the use of an open control loop. This open loop is modulated according to the voltage at the output, with the output voltage controlled by a pair of error amplifiers. The error amplifiers compare the actual output voltage with a reference voltage set by a feedback resistor. If the output voltage is not up to the set value, then the error amplifier amplifies the difference between these two voltages. This amplified difference is then compared to two internal reference voltages, resulting in signals according to the incoming voltage. This signal is then used to adjust the output voltage accordingly.

The UA78L09ACDRE4 works by taking a constant DC input voltage, rectifying and filtering it to form an AC voltage, then using this AC voltage to drive the output voltage using a power transistor. The output voltage is then modulated according to the voltages at the error amplifier. The efficiency of this device is further increased by its low power dissipation and low quiescent current. Its output voltage can be adjusted anywhere from 2V to 12V, making it a very versatile device.

Overall, the UA78L09ACDRE4 applies a linear voltage regulator principle to perform highly accurate voltage regulation with a low quiescent current. This makes it an ideal choice for a range of battery-powered applications, where accuracy and small power dissipation are essential.

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