KA78L05AAZBU

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Voltage regulators are an essential component of many power supplies and industrial systems. The KA78L05AAZBU, a linear voltage regulator, is an important device with a wide array of applications. This article will provide an understanding of the KA78L05AAZBU’s application field and its working principle.

General Description and Application Field

The KA78L05AAZBU is a three-terminal linear positive voltage regulator designed to provide positive output voltages as low as 1.2V and up to a maximum of 5V. The KA78L05AAZBU is available in three different packages: a 8-lead Dual-In-Line (DIP8) package, an 8-lead Small-Outline Integrated Circuit (SO8) package and an 8-lead Shrink Small-Outline Package (SOP8) package. This device is commonly used as an output voltage stabilizer in notebooks and automotive products. In addition, the KA78L05AAZBU is used in industrial products such as measuring and controlling modules and alarm systems.

Pinout, Equivalent Parts and Alternatives

The KA78L05AAZBU’s pinout is shown below. Pin 1 is the input voltage (VIN), Pin 2 is ground (GND), and Pin 3 is the output voltage (VOUT). The other five pins are not used.

The KA78L05AAZBU is a voltage regulator integrated circuit (IC) and it is compatible with several equivalent parts, such as LM1117 800, LM1117 800C and LD1117 800. Furthermore, there are several alternatives for the KA78L05AAZBU, such as the KA78L09AAZ-TR, KA78L05AAZ-TK and KA78L09AAZ-TK.

Working Principle

The KA78L05AAZBU is a three-terminal linear positive voltage regulator, which means that it employs a linear regulation technique to maintain a constant set output voltage even if the input voltage fluctuates. This is done by maintaining the voltage difference between the input and output voltages, known as the dropout voltage, within a specified range. The KA78L05AAZBU accomplishes this by using an internal series of transistors and zener diodes.

When the input voltage exceeds the output voltage, the excess energy is passed through a zener diode. The zener diode limits the current across the series-connected transistors, allowing the voltage between the input and output to stay fixed. When the input voltage is below the output voltage, the series-connected transistors take over to boost the input voltage to the output voltage, thus regulating the output voltage so that the voltage difference between the input and the output stays within the specified range.

Dynamic Characteristics

The KA78L05AAZBU’s dynamic characteristics describe how it works in different situations. One of the KA78L05AAZBU’s dynamic characteristics is its line regulation. This describes how the output voltage is impacted by fluctuations in the input voltage. The line regulation of the KA78L05AAZBU is typically as low as 15mV/V. It also has a load regulation of 15mV, which describes how the output voltage is impacted by variations in the load current.

The KA78L05AAZBU also has a temperature coefficient of 0.5mV/°C, which describes how the output voltage is impacted by changes in the operating temperature. The KA78L05AAZBU has an operating temperature range of -40°C to +85°C, and a maximum operating current of 100mA. In addition, the KA78L05AAZBU has a maximum transient response of 50%. This describes how quickly the output voltage recovers from a transient over- or undershoot.

Conclusion

The KA78L05AAZBU is a three-terminal linear positive voltage regulator that is capable of providing a positive output voltage of up to 5V. It is commonly used as an output voltage stabilizer in notebooks, automotive products, measuring and controlling modules and alarm systems. The KA78L05AAZBU is capable of providing excellent line and load regulation, as well as a low temperature coefficient and a fast transient recovery. While there are several equivalent parts and alternative parts available for the KA78L05AAZBU, the device is capable of providing a wide range of reliable and accurate output voltages.

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