L78L12ABZ

Current - Output:	100mA
Base Part Number:	L78L12A
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Short Circuit
Control Features:	--
PSRR:	42dB (120Hz)
Current - Supply (Max):	6.5mA
Current - Quiescent (Iq):	6mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Bulk

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Introduction

The L78L12ABZ is a three-terminal voltage regulator from the Texas Instruments family of linear voltage regulators. It is designed to provide a constant output voltage of 12V, which can be divided down from a higher input voltage using a series network of resistors. The L78L12ABZ is a monolithic integrated circuit designed for use in low-voltage linear voltage regulation applications. It is also capable of providing over-current protection and thermal shutdown. This integrated circuit is a simple solution for providing regulated power supplies with small voltage drop and low noise.

Application field

The L78L12ABZ is ideal for a variety of low-voltage linear voltage regulation applications, such as in car audio systems, consumer electronic products, industrial motor control circuits, motor protection, and lighting systems. Its features make it a suitable choice for many consumer and commercial markets, such as audio/visual electronics, automotive and consumer applications, computer peripherals, and power systems.

Working principle

The L78L12ABZ is an adjustable voltage regulator with a fixed output voltage of 12V. It contains a transistorized series regulator which is connected to the input and output of the device. The amount of voltage drop across the regulator is determined by a potentiometer whose resistance is adjustable. The output voltage of the regulator is kept constant irrespective of changes in input voltage by varying the amount of current passing through the series regulator using the differential amplifier.The differential amplifier senses the difference between the input voltage and the voltage produced by the transistorized series regulator. If the input voltage rises, the voltage produced by the series regulator also increases. The differential amplifier will sense this difference and decrease the current passing through the series regulator. This will cause the output voltage to remain constant.

Conclusion

The L78L12ABZ is an ideal solution for simple low-voltage linear voltage regulation applications. The device is thermally stable and offers excellent current limiting protection, making it suitable for a variety of industrial, automotive and consumer applications. Its adjustable output voltage can easily be modified to suit a wide range of applications. With its three-terminal design, the L78L12ABZ is a simple and cost-effective way to provide a regulated power supply with a low voltage drop and low noise.

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