L7809ACD2T-TR Integrated Circuits (ICs)

Current - Output:	1.5A
Base Part Number:	L7809A
Supplier Device Package:	D2PAK
Package / Case:	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	61dB (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Part Status:	Obsolete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:	Tape & Reel (TR)

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Application Field and Working Principle of L7809ACD2T-TR

Linear voltage regulators are popular among engineers because they provide the stable voltage necessary to power embedded systems, even when there’s significant fluctuation in the power source. A widely used example of this technology is the L7809ACD2T-TR, which is a positive voltage regulator with positive output voltage and negative input voltage. In this article, we\'re going to dig deeper into the application field and working principle of this device.

Application Field for L7809ACD2T-TR

The L7809ACD2T-TR is primarily used for automotive applications, as it offers low quiescent current to support long periods of inactivity. In addition to its use in cars, it is also useful in power gliders and other light electric vehicles with long mileage. Other industries that use this device include robotic control systems, battery charging, networking, healthcare, and consumer electronics.

Working Principle of L7809ACD2T-TR

The L7809ACD2T-TR is a three-terminal, adjustable voltage regulator. It consists of an internal voltage reference, voltage comparator, and an N-channel MOSFET. The internal voltage reference is used to compare the input voltage to the reference voltage, which is set by the user.When the power supply voltage reaches the reference voltage, the voltage comparator triggers the P-channel MOSFET, allowing current to flow from the Input to the Output terminals. The voltage across the output terminals remains constant, regardless of the input voltage.The current-limiting protection of the L7809ACD2T-TR is provided by two full-bridge oscillators. When the load current exceeds the level set by the current-limiting protection, the full-bridge oscillators are triggered, resulting in a reduction in the current to the output terminal.

Conclusion

The L7809ACD2T-TR is an excellent choice for automotive applications, and its low quiescent current and adjustable output voltage make it an ideal choice for a wide range of applications. Its internal voltage reference and voltage comparator allow it to easily maintain a stable output voltage, while its built-in current-limiting protection keeps it from becoming overloaded. As a result, it is a popular choice for engineers looking for a reliable, low-cost linear voltage regulator.

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