KA317LZTA Integrated Circuits (ICs)

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The KA317LZTA is a three-terminal linear voltage regulator from ON Semiconductor. Its purpose is to provide a stable, regulated output voltage from an unregulated input source in difficult electrical environments where conventional regulators can’t perform. The KA317LZTA linear regulator has numerous features to make it attractive for use in a variety of power management applications. These features are discussed below, along with its operating principle.

Applications

The KA317LZTA linear regulator is designed for a wide range of applications, ranging from low-frequency power supplies to precision shunt regulation. It can be used in automotive, telecommunications, industrial and general-purpose applications, as well as many others. It is well-suited for applications where high-frequency ripple is present, such as those employing switching power supplies, and is also ideal for applications in which low-noise power is required.

The KA317LZTA linear regulator is particularly well-suited for hostile environments such as hotspots, engine compartments and construction sites, as it exhibits excellent temperature and voltage coefficients which ensure stable regulation in extreme conditions. The device is also designed for high-density, small form factor installations and is capable of providing output voltages from 1.5V up to 24V with a maximum load current of 1.5A.

Working Principle

The KA317LZTA linear regulator uses an internal transistor to regulate the output voltage according to the difference between the reference voltage and the input voltage. In a three-terminal circuit layout, the output voltage is connected to the regulator’s reference pin and the input voltage is connected to the regulator’s non-inverting input. When the input voltage is higher than the reference voltage, the internal transistor turns on and reduces the output voltage to the desired level. Conversely, when the input voltage is lower than the reference voltage, the internal transistor turns off and the output voltage remains at the reference voltage.

The internal transistor is controlled by an error amplifier, which monitors the difference between the reference voltage and the input voltage. Additionally, the linear regulator is designed for low drop-out operation, meaning that even when the input voltage is only slightly higher than the reference voltage, the transistor remains turned on and regulation is maintained. The KA317LZTA linear regulator also includes a thermal shutdown circuit that prevents the device from overheating in extreme conditions.

Conclusion

The KA317LZTA linear regulator from ON Semiconductor is a three-terminal device designed for use in a variety of power management applications. Its internal transistor is controlled by an error amplifier, which monitors the difference between the reference voltage and the input voltage, enabling it to provide reliable and accurate output voltages in hostile environments. It also includes a thermal shutdown circuit to prevent damage from overheating.

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