MC78M12CT

Series:	--
Packaging:	Tube
Part Status:	Obsolete
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):	--
Current - Output:	500mA
PSRR:	80dB (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-220AB
Base Part Number:	MC78M

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MC78M12CT Application Field and Working Principle

The MC78M12CT High Voltage Standard Fixed-Output Voltage Regulator is a Negative Low Drop Out (N-LDO) three-terminal regulator with the output voltage programmable from -6V to -20V. The MC78M12CT is available in various on-board configurations and packages, with a variety of protection functions, including Input/Output protection, current limit protection, and thermal shutdown. The MC78M12CT is part of the Texas Instruments family of PMIC - Voltage Regulators - Linear.

Description of MC78M12CT

The MC78M12CT is a monolithic integrated negative high voltage regulator designed to provide negative output voltages up to -20V. The MC78M12CT is a fixed output regulator with an adjustable output voltage range set by a single resistor. The device is designed to provide regulated voltage and low output impedance in loads. Due to its low output impedance, the MC78M12CT can also be used in applications with large load or supply transients, making it suitable for a variety of industrial, commercial and automotive applications.

Features of MC78M12CT

The MC78M12CT offers a wide range of features including Load Transient Response, Pulse-By-Pulse Current Limiting, On-Chip Ramp Compensation, Output Voltage Adjustability, Internal Soft-Start, Low-Quiescent Current Consumption, Short-Circuit Protection, and Thermal Shutdown. It also includes an adjustable current limit threshold and a low dropout voltage of typically 1.3V. The fixed-output voltage is set with a single resistor and is fully protected against shorts and open-loop conditions.

Application Areas of MC78M12CT

The MC78M12CT is a linear 3-terminal regulator that is designed for use in a wide range of automotive, industrial, and commercial applications. It can be used as a negative voltage supply for microprocessors, voltage references, battery-operated systems, and a variety of other output voltage applications. The device is suitable for low-impedance load applications such as low-power logic, LCD drivers, audio amplifiers, RF power amplifiers and other applications requiring a high quality, low-noise supply. The adjustable output voltage range, adjustable current limit threshold and other features make the MC78M12CT suitable for a variety of negative output voltage applications.

Working Principle of the MC78M12CT

The MC78M12CT is a Low Dropout (LDO) three-terminal negative regulator with a high output voltage accuracy and a fast response to transients. It uses a voltage reference, a pass element, an error amplifier and a current limit amplifier to maintain the output voltage within a 1% accuracy over the temperature and line regulation range. When the input voltage exceeds the output voltage by about 1.3V, the LDO begins to regulate the output voltage. In normal operation, the pass element conducts and the output voltage is regulated by means of a voltage divider, composed of an external feedback resistor and an internal reference voltage. The current limit amplifier of the MC78M12CT monitors the output current and limits it to a preset maximum. If the output current exceeds the preset limit, the amplifier turns off the pass element, and the output voltage is limited to the dropout voltage. The MC78M12CT also features a short circuit protection protection circuit to protect the device against short circuits. If a short circuit is detected, the current limit amplifier will disconnect the pass element, ensuring that the device does not experience a high current overload. The MC78M12CT also includes an on-chip ramp compensation which ensures that the current limit and the power-up sequence are smoothly transitioned. The device also includes a low quiescent current consumption and a thermal shutdown circuit that protects against excessive temperature.

Conclusion

The MC78M12CT High Voltage Standard Fixed-Output Voltage Regulator is a Negative Low Drop Out (N-LDO) three-terminal regulator with the output voltage programmable from -6V to -20V. It provides a wide range of features including Load Transient Response, Pulse-By-Pulse Current Limiting, On-Chip Ramp Compensation, Output Voltage Adjustability, Internal Soft-Start, Low-Quiescent Current Consumption, Short-Circuit Protection and Thermal Shutdown. This linear 3-terminal regulator can be used in a wide range of automotive, industrial, and commercial applications such as microprocessors, voltage references, battery-operated systems, and other output voltage applications. The working principle of the MC78M12CT includes voltage reference, a pass element, an error amplifier, a current limit amplifier, a short circuit protection, and a thermal shutdown, which ensures that the device provide stable and reliable performance.

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