MC7809AECT

Current - Output:	1A
Base Part Number:	MC7809
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:	62dB (120Hz)
Current - Quiescent (Iq):	6mA
Series:	--
Voltage Dropout (Max):	2V @ 1A (Typ)
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	35V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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MC7809AECT Application Field and Working Principle

IntroductionThe MC7809AECT is a 3-terminal integrated-circuit voltage regulator designed to provide adjustable output voltage at an output current of up to 100 milliamps. This device utilizes an advanced design concept and provides unsurpassed performance in terms of line and load regulation. It is ideal for a variety of applications including computer, industrial, communication and instrumentation equipment. Application FieldThe MC7809AECT is used in a variety of applications, including computer, industrial, communication, and instrumentation equipment, as well as in small power supplies. Its output voltage can be adjusted over a range of 0.8 to 9V with an output current of up to 100mA. It has low noise and ripple performance and can be used as a precision reference for battery-powered equipment. It is also used in converters and power supplies, where it functions as a voltage regulator.Working PrincipleThe MC7809AECT consists of three main components - an error amplifier, a reference voltage generator, and a power transistor. The error amplifier measures the output voltage of the device and compares it with a reference voltage. If the actual voltage is lower than the reference voltage, the error amplifier will increase the output current and the output voltage will rise. If the actual voltage is higher than the reference voltage, the output current will decrease and the output voltage will decrease. This process of adjustment is repeated until the output voltage is equal to the reference voltage.Internal Block DiagramThe MC7809AECT is a monolithic linear voltage regulator. The block diagram of the device consists of an error amplifier, reference voltage generator, power transistor, and current limiting circuits. The error amplifier compares the output voltage with the reference voltage and adjusts the output current accordingly. The reference voltage generator produces a stable reference voltage that is used to set the output voltage. The power transistor is used to convert the output current from the error amplifier into an output voltage. The current limiting circuits protect the device from over current and short circuit conditions.Key FeaturesThe MC7809AECT has several key features that make it an ideal solution for a variety of applications. It has an excellent line/load regulation performance of 0.1%. It also has low noise and ripple performance - the output voltage is stable even at high frequencies. It is tightly regulated over a temperature range of -40 to 125°C. The device also has over-current and short circuit protection to protect the device from damage.ConclusionThe MC7809AECT is an ideal voltage regulator for a wide range of applications. It offers excellent performance in terms of line/load regulation, low noise and ripple performance, and temperature range. Its over-current and short circuit protection make it highly reliable. With these features, the MC7809AECT is a great solution for computer, industrial, communication, and instrumentation equipment.

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