UA78L05ACD

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The UA78L05ACD is a three-terminal linear voltage regulator. It is usually used in PCs, test and measurement instrumentation, battery powered systems, telecom systems and other low noise low power supply applications. It is a cost-effective regulator in terms of high performance and low power.

The UA78L05ACD has an input voltage range of 2.7 V to 22 V, an output voltage range of 5 V (with an accuracy of ± 5 %) and a maximum load current of 100mA. It is also specified for an operating temperature range of -40°C to 85°C, a standby current of 500 μA and a quiescent current of 120 μA at full load. It offers a very low dropout voltage of less than 1.4V at full load, which helps to achieve excellent efficiency and keep the output voltage stable.

The UA78L05ACD has a simple pinout and is easy to use. There are three pins: ground (GND), input (IN) and output (OUT). Since the regulator has a low quiescent current, it can be used in either single-supply or split-supply designs. It has a variety of features such as current limiting, thermal shutdown, and reverse-battery protection.

The working principle of the UA78L05ACD is based on the concept of linear voltage regulators. A linear regulator is a voltage regulator that maintains a constant output voltage by regulating the input voltage to the output. It works by comparing the feedback voltage (VFB) to the reference voltage (VREF). If the feedback voltage is higher than the reference voltage, then the error amplifier output will be negative and the pass transistor will be switched off, reducing the load current. This reduction in load current reduces the output voltage, thus maintaining the desired voltage level. Similarly, if the feedback voltage is lower than the reference voltage, the output of the error amplifier will be positive and the pass transistor will be switched on, increasing the load current and thus increasing the output voltage to maintain the desired level.

The UA78L05ACD is a highly efficient and cost-effective solution for low noise, low power applications. It offers excellent performance and excellent protection features, making it an ideal choice for a variety of applications.

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