LD1117DT18TR

Current - Output:	800mA
Base Part Number:	LD1117
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	75dB (120Hz)
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1.2V @ 800mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	15V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LD1117DT18TR is a low-dropout adjustable, three-terminal linear regulator which can be powered with input voltages up to 18V and deliver output voltage from 1.2V to 11.8V with a typical dropout of 50 mV at 1A of load current. With this module, it is able to be used in a wide range of applications in various industries, including communication systems, consumer electronics, industrial equipment, and computers. It is designed to supply adequate electrical power with high efficiency and reliability.In terms of its application field, LD1117DT18TR can be used in communication systems, providing a low-noise voltage source for high-speed digital circuits. It enables supply of a stable and firm current to the microprocessors and keeps the loading of the system in balance. Its small size and low-dropout voltage of 50 mV make it suitable for applications with narrow voltage range.The LD1117DT18TR can also be applied in industrial equipment such as factory-stored information systems, quick access storage systems or motor controllers. It is able to maintain a steady voltage level in the system so that high efficiency and precision can be ensured in a very long time. The three-terminal linear regulator also offers system stability and enables the factory-stored information systems to keep the information in store correctly. In addition, its low-power consumption makes it suitable for quick access storage systems, which require a high energy efficiency.Furthermore, LD1117DT18TR is also an ideal device for consumer electronics, specifically the audio and video equipment. It is able to maintain a good SNR with low-noise power provided by current regulators. This regulator also provides high-speed switching capability and reduction of switching loss for video signal conversion systems. As for the audio system, the LD1117DT18TR can ensure precise control of the current source to operate the speakers correctly and improves the signal-to-noise ratio of the outputs.Lastly, LD1117DT18TR is suitable for computers. It can provide stable power supply and precise current control, which is suitable for a wide range of applications and improves the power efficiency of the computer system. With its high output voltage accuracy, it is also able to prevent any damaging signals to the ICs due to power noise.In terms of its working principle, the LD1117DT18TR is a three-terminal linear regulator which utilizes the principle of feedback control. Its input voltage can be fed through the input pin while the output voltage is connected to the output pin. The third terminal or the adjustment terminal utilises the feedback network which contains a voltage reference, operational amplifier and a series circuit which calculate the voltage difference between the input and output. The voltage reference monitors the voltage level of the output and generates a corresponding reference signal. The output signal will then be amplified by the operational amplifier and sent to the base of the NPN transistor. The transistor will then be driven depending on the signal, turning the components into either fully on or off mode. As for the series circuit, its function is to supply current for the transistor when it is turned on.When the voltage difference between the input and the output is high, the operational amplifier will increase its output value, turning the base of the transistor to high level. The series circuit will then supply the current to the transistor and the voltage output of the LD1117DT18TR will keep dropping until the difference between the input and output voltage becomes small. As a result, the output voltage will stay constant.The working principle of the LD1117DT18TR provides designers with a wide range of possibilities of setting different output voltage levels. The exact voltage can be adjusted by tuning the output voltage of the adjustment terminal by external resistor and further stabilised by adding a capacitor in parallel with the resistor. This makes the LD1117DT18TR an ideal choice for wide varieties of applications.To sum up, LD1117DT18TR is an adjustable three-terminal linear regulator with up to 18V input voltage and output voltage from 1.2V to 11.8V with a dropout voltage of 50 mV at 1A load current. It is able to be used in communication systems, consumer electronics, industrial equipment, and computers. Its working principle utilises feedback control, allowing the output voltage to be precisely adjusted with external resistor. The low-dropout voltage, wide voltage range and fine control make it an ideal choice for many different applications.

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