KA7912TU

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KA7912TU is a 3-terminal adjustable linear voltage regulator designed for use in a wide range of applications. It can provide output current of up to 1A and adjustable output voltage between 1.25V and 32V. Its high efficiency design makes it suitable for both linear and switch-mode power supply applications. In addition, its low quiescent current and wide temperature range make it ideal for battery powered applications.

Features

• Bright green chip design
• Low quiescent current
• Wide temperature range
• High efficiency
• Output current up to 1A
• Adjustable output voltage
• 3-terminal adjustable
• Low cost and small size

Applications

KA7912TU can be used in a wide range of applications such as:

• Linear and switch-mode power supply
• Battery powered applications
• Voltage control and sequencing
• Battery charging
• Computer peripheral devices
• Communications systems

Working Principle

The KA7912TU is a linear voltage regulator which use an internal voltage reference source to provide a regulated output voltage. Its internal circuitry includes a two-stage design consisting of a series-pass element consisting of an N-Channel MOSFET and an adjustable voltage regulator comprising an error amplifier and an internal reference.

The series-pass element regulates the output voltage according to the following equation:

V_out=V_ref+I_load* R_adjust

Where V_ref is the internal reference voltage, typically 1.25V, and R_adjust is the external resistance connected to the ADJ pin, which sets the output voltage according to the equation above.

The error amplifier is used to regulate the output voltage, by comparing the output voltage (measured at the FB pin) with the internal reference voltage, and adjusting the MOSFET\'s gate voltage accordingly.

The output voltage of the KA7912TU can be set to any value within its specified range, by setting the external resistance connected to the ADJ pin accordingly.

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