KA7812AETU

Series:	--
Packaging:	Tube
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	35V
Voltage - Output (Min/Fixed):	12V
Voltage - Output (Max):	--
Voltage Dropout (Max):	2V @ 1A (Typ)
Current - Output:	1A
Current - Quiescent (Iq):	6mA
PSRR:	60dB (120Hz)
Control Features:	--
Protection Features:	Over Temperature, Short Circuit
Operating Temperature:	0°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220-3
Base Part Number:	KA7812

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Introduction

The KA7812AETU is a positive linear voltage regulator manufactured by ON Semiconductor. It is a type of power management integrated circuit (PMIC) with voltage regulators, specifically Linear voltage regulators. The KA7812AETU is designed with a 3-pin surface mount package to reduce contact area and provide high wattage power dissipation. It is also equipped with thermal overload and short circuit protection.

Application Area

The KA7812AETU is a cost-effective solution for supplying a fixed output voltage to a range of electronic products and applications. It is suitable for both linear and switch mode power supplies. As a Voltage regulator, the KA7812AETU can be used to regulate the input AC or DC line voltage by providing a constant output voltage. The KA7812AETU can also be used as a current limiter to reduce the inrush current of heavy line loads.It can be used in many applications including LED lighting, consumer electronics, industrial control, automotive, telecommunications, and medical electronics.

Features and Advantages

The KA7812AETU is able to provide a fixed 1.5A output current with a wide operating input and ambient temperature. It is equipped with an on-chip thermal overload protection. Its low dropout voltage (less than 1.5V) maximizes efficiency and reduce power consumption. It has a soft-start function to minimize inrush current and avoid overshoot of output voltage. It is also able to provide high voltage isolation from input and output even with a single supply.

Working Principle

The KA7812AETU is a 3-pin device consisting of a voltage reference, an error amplifier, a P-channel power MOSFET and an internal current limiter. It works in a closed-loop topology.When the input voltage (Vin) is applied, the voltage limiter measures the voltage and compares it with an internal reference voltage (Vref). If the voltage is higher than Vref, the error amplifier increases the gate voltage of the P-channel power MOSFET that is connected between the input and output, thus increasing the voltage drop across the MOSFET and steering it towards the load circuit.The current limiter monitors the current flowing through MOSFET and limits it to 1.5A at any given time. When the output voltage reaches its desired level, the transistor is switched off until either the Vin or Vo changes.

Conclusion

The KA7812AETU is a positive linear voltage regulator designed to regulate input AC or DC line voltage by providing a constant output voltage with its 3-pin surface mount package. It is cost effective and suitable for both linear and switch mode power supplies. It offers excellent power dissipation, thermal overload and short-circuit protection and a soft-start function to minimize inrush current. It is a suitable choice for various applications such as LED lighting, consumer electronics, industrial control, automotive, telecommunications and medical electronics.

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