Introduction

KA7912 is an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5A of load current. This device is suitable for applications that require higher output currents than the commonly used type of voltage regulator.

With an input voltage from 2.8v to 25v, this regulator can provide regulated output voltage from 0.8v to 15v. It provides excellent line and load regulation, high output current and outstandingly long-term stability. It offers over-temperature protection as well.

Application Fields

KA7912 is well suited for voltage regulation applications such as DC/DC converters, power supplies, battery chargers, portable communication devices and other low-cost, small size system applications.

This device can also be used in robotics applications to provide power to motors and other devices. In addition, it can be used for voltage regulation for embedded systems, RF transmitter/receivers, computer motherboards, and other industrial applications requiring precise voltage regulation.

Working Principle

KA7912 is an adjustable voltage regulator in a three-terminal configuration, similar to that of the 7805 and 7812 series of regulators. It includes an internal negative-temperature coefficient thermistor, an internal current limiter, and a shunt voltage regulator that provides regulation over a wide range of output voltages.

The device is designed to operate with a minimum input-output differential of 1.5V, which makes it an ideal choice for applications which are sensitive to ripple or which need to operate with very low voltage drops. The device operates on the principle of negative feedback, in which the output voltage is compared to a reference voltage and the error is used to automatically regulate the output voltage.

The output voltage is also limited by the current-limiting feature. If the output current exceeds the specified current limit then the regulator will reduce the output voltage in order to protect itself from overcurrent. The thermal shutdown feature helps the device protect itself from excess heat and ensures the long-term reliability of the device.

Conclusion

KA7912 is a versatile, 3-terminal positive voltage regulator that is ideal for applications requiring high output current, excellent line and load regulation, and outstandingly long-term stability. It is suitable for a wide range of applications including DC/DC converters, power supplies, and need-stable voltage regulation in embedded systems. The device uses negative feedback to regulate the output voltage and includes an internal current limiting and thermal protection functions.