Current - Output:	1A
Base Part Number:	LM7812
Supplier Device Package:	TO-220-3
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	71dB (120Hz)
Current - Quiescent (Iq):	8mA
Series:	--
Voltage Dropout (Max):	2V @ 1A (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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LM7812ACT Application Field and Working Principle

Introduction

The LM7812ACT is an integrated linear voltage regulator designed for use in automotive electrical systems. It provides stable, reliable and cost-effective power to a broad range of logic, power and computing applications. The LM7812ACT includes a wide range of features and safety protections to ensure high reliability in a wide variety of applications.

Application Field

The LM7812ACT is well suited for automotive applications, providing regulated voltages from 12V to 25V. The output current capability of the LM7812ACT can reach up to 10A, making it suitable for powering a wide range of systems such as power supplies, audio amplifiers and lighting solutions.In automotive applications, the LM7812ACT can be used in systems such as power windows, power steering, airbag and airbag deactivation systems, and other applications where accurate voltage regulation is required.In addition, the LM7812ACT can be used in home automation systems, industrial control/monitoring systems and portable electronic devices.

Features and Benefits

The LM7812ACT comes with a number of features and benefits: - Wide range capability: Voltage range from 12V to 25V. - High current output: Output current capability up to 10A. - Low dropout: The LD/LDO architecture provides a minimum dropout voltage at 10V. - Over current protection: Internal over current protection. - Low temperature coefficient: Low temperature coefficient of 5mV/°C. - Low temperature operation: High temperature operation with maximum temperature of 125°C. - Robust design: Robust design with surge protection and reverse battery protection. - Small footprint: Small size and low profile, measuring 11.45mmx7.2mm.

Working Principle

The LM7812ACT is a monolithic linear voltage regulator with an input voltage range of 12V to 25V. It consists of an adjustable voltage regulator and three voltage reference blocks. The voltage regulator comprises of an error amplifier, a pass transistor and a current limit circuit. The three reference blocks provide internal reference voltages of 1.24V, 1.5V and 1.8V.The LM7812ACT regulates its output voltage by comparing the voltages from its internal reference blocks with a reference voltage from an external voltage source. The difference between the two voltages is amplified by the error amplifier and used to control the pass transistor, which then regulates the output voltage to the desired level.The output voltage is also protected by a current limit circuit and an internal protection feature. In the event of an over current or reverse battery condition, the LM7812ACT will shut down and the output voltage will be reduced to a safe level.

Conclusion

The LM7812ACT is a versatile and reliable integrated linear voltage regulator designed for use in automotive electrical systems. It provides stable and reliable power to a broad range of logic, power and computing applications. It offers a wide range of features including low dropout, over current protection, low temperature coefficient, high temperature operation and a robust design. Additionally, it has a small size and low profile, making it ideal for applications where space is limited.

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