NJM317DL1-TE1

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Adjustable
Number of Regulators:	1
Voltage - Input (Max):	40V
Voltage - Output (Min/Fixed):	1.25V
Voltage - Output (Max):	37V
Voltage Dropout (Max):	--
Current - Output:	1.5A
PSRR:	80dB ~ 65dB (120Hz)
Control Features:	--
Protection Features:	--
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package:	TO-252-3

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Introduction

Voltage regulators are used in AC or DC power supply systems to control and maintain the output voltage at a certain level by absorbing the excess energy. As the name implies, linear voltage regulators (LVR) provide linear regulation using linear components, such as resistors, capacitors, transistors, operational amplifiers and so on. They are efficient at providing smooth, accurate voltage regulation at low power levels and in an array of applications such as AC/DC converters, battery chargers, portable electronic devices and PCs.NJM317DL1-TE1 is an advanced linear voltage regulator (LVR) from New Japan Radio Co., Ltd. that has been designed to provide excellent voltage regulation performance in both AC and DC applications. It features an ultra-low dropout of 0.4V, low quiescent current of 9micro-amps, and power-on-reset protection circuit that eliminates the need for external reset circuits.

Features and Benefits

The most noticeable feature of the NJM317DL1-TE1 is its high-performance line regulation and load regulation. Line regulation is the amount of change in the output voltage when comparing the change in the input voltage and it is very important for systems that require precise control over the output voltage. NJM317DL1-TE1 offers an adjustable output voltage range between 1.2V to 13.2V and utilizes an ultra-low dropout voltage to maintain the accurate output voltage even when the input voltage drops down to 0.4V below its output voltage. The output voltage is also very stable with a very low temperature coefficient of 0.02%.In addition to its excellent line regulation, the NJM317DL1-TE1 also offers excellent load regulation of ±1%. Load regulation is the amount of change in the output voltage when the load current changes from zero to full load. This means that when the load current changes the output voltage will remain steady at the prescribed voltage level.The NJM317DL1-TE1 also features an internal power-on reset protection circuit which eliminates the need for external reset circuits and offers high accuracy with a wide range of input and output voltages. The power-on reset protection also helps to protect the circuit from exceeding its maximum power dissipation. Furthermore, the low overall quiescent current of 9uA at full load conditions is ideal for battery-operated applications.

Applications

The excellent voltage regulation and low quiescent current make the NJM317DL1-TE1 an ideal choice for a variety of applications. It is commonly used in AC/DC converters, battery chargers (especially for portable electronic devices), PCs and other electronic circuits. In addition, the NJM317DL1-TE1 is also used in automotive applications such as on-board diagnostics and power steering systems. It can also be used for boosting and bucking applications, as well as for voltage step-up and step-down applications.

Working Principle

The NJM317DL1-TE1 is a feedback linear voltage regulator that works on the principle of negative feedback. The regulator consists of an error amplifier and an output transistor which are both connected in series with a feedback loop. When the input voltage is greater than the output voltage, the error amplifier senses this difference and generates a negative voltage that is applied to the output transistor. This causes the voltage across the output transistor to drop, reducing the current passing through the transistor and ultimately reducing the output voltage until it reaches the prescribed level. Conversely, when the input voltage drops below the output voltage, the error amplifier senses this difference and generates a positive voltage that is applied to the output transistor. This causes the voltage across the transistor to rise, increasing the current passing through the transistor and ultimately increasing the output voltage until it reaches the desired output voltage.

Conclusion

The NJM317DL1-TE1 is an advanced linear voltage regulator that offers excellent line and load regulation performance. It features an ultra-low dropout voltage of 0.4V, a low quiescent current of 9micro-amps, and power-on-reset protection circuit which eliminates the need for external reset circuits. These features make the NJM317DL1-TE1 an ideal choice for a wide range of AC and DC applications, such as AC/DC converters, battery chargers, automotive systems, and step-up and step-down applications. The working principle of the NJM317DL1-TE1 is based on the principle of negative feedback which enables it to maintain an accurate output voltage even at low input and output voltages.

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