KA7809AETU

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PMIC (Power Management IC) has been playing an important role in power management, and voltage regulator has been one of the most popular and commonly used power device in the field of power management. KA7809AETU, as a linear voltage regulator, belongs to this class. What are the application field and working principle of this device? Let’s find the answer here.

Applications

KA7809AETU, with a range of Input voltage from -25V to 6V, is mainly used in automotive, industrial and consumer applications. In automotive field, it mainly serves as a regulator for automotive circuit, providing precise output voltage for various components. In industrial area, it is used to control actuators, and fuel cell regulation, perfect for high efficiency, low power solution. In consumer applications, it can be applied for mobile phones, and other consumer electronics to provide precise and reliable output voltage.

Working Principle

KA7809AETU is a linear voltage regulator, and its working principle is based on a part of the feed back loop formed by an operational amplifier. An operational amplifier compares the reference voltage to the voltage on the output pin, and then the input control current induces the output driver which adjust the output voltage to match the reference voltage.

The desired output voltage is obtained by adjusting the adjustable resistor, while the output voltage is maintained by the operational amplifier by comparing the output voltage and the reference voltage. The operational amplifier has an error frequency of typically 1kHz to 8kHz, and this frequency is constant under normal operating conditions. An important fact to observe is that the output current from the operational amplifier is limited by its output impedance.

The linear voltage regulator also includes three other components: an ADC, pass transistors, and current-sensing resistors. ADC is used to measure the output voltage and pass transistors are used to control the output current. Current-sensing resistors are used to measure the current flow through the regulator. All these components work together to ensure stable voltage regulation.

Conclusion

KA7809AETU is a linear voltage regulator with a range of Input voltage from -25V to 6V, which is widely used in automotive, industrial and consumer applications. Its working principle is based on a part of the feed back loop formed by an operational amplifier, and other three components including an ADC, pass transistors, and current-sensing resistors are also used for efficient voltage regulation.

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