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PMIC - Voltage Regulators - Linear

UA78L09ACPKG3 is a low-power 9-volt linear voltage regulator that is used to maintain a stable output voltage in a wide range of applications. It has a wide operating voltage range of 2.85 to 26V, making it suitable for a variety of input sources, including battery, AC or solar power. The low dropout voltage of 0.8V and maximum operating temperature range of -40 to +125°C further enhance its overall utility. UA78L09ACPKG3 features low quiescent current, high efficiency, and minimum output noise, making it ideal for powering low-noise analog and digital circuits.

applications

The UA78L09ACPKG3 is a versatile regulator that is suitable for a wide range of low-power applications. It is used in battery-operated applications, such as powering PLCs, remote monitoring equipment, data acquisition systems, and other applications where low-leakage and low-noise power is required. It is also suitable for powering microcontroller-based systems and analog circuitry, such as precision instrumentation, audio/visual equipment, and medical systems.

working principle

The working principle of UA78L09ACPKG3 is based on the differential-pair comparator architecture shown in Figure 1. This architecture consists of two transistors, a differential amplifier and an error amplifier. The UA78L09ACPKG3 is configured with a reference voltage and an adjustable feedback resistor. The output of the differential amplifier is fed back to the inverting input of the error amplifier. The output of the error amplifier is then fed back to the base of the transistor pair. The base voltage is compared to the reference voltage, and the difference is automatically adjusted, causing the output of the UA78L09ACPKG3 to remain constant.

Conclusion

UA78L09ACPKG3 is a versatile low-power linear voltage regulator suitable for use in battery operated applications, automotive systems, and more. It has a wide operating voltage range, low dropout voltage and low quiescent current. It is also characterized by high efficiencies, minimum output noise and wide temperature range. The UA78L09ACPKG3 works on the principle of differential-pair comparator architecture, where two transistors, a differential amplifier and an error amplifier work together to maintain a constant output voltage.

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