SP317V2-L/TR

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Linear voltage regulators are more complex than switching type regulators since they use an active feedback loop to control the output voltage. They are able to provide a much better voltage stability than other solutions for a wide range of loads. The SP317V2-L/TR is an example of such a linear voltage regulator with an adjustable output voltage and a wide operating range. This linear voltage regulator is designed for automotive applications and has been specially optimized to provide excellent electrical performance.

Application Field

The SP317V2-L/TR is designed to supply high accuracy, low noise power source in automotive applications. The regulator is available in an adjustable version and offers the user flexibility in controlling output voltage. In addition, it has excellent line/load regulation characteristics under a wide range of operating conditions. The device is also very well suited for providing stable power for automotive infotainment systems, as well as other automotive applications.

The SP317V2-L/TR has a wide operating range with a maximum output voltage of 37V and a minimum output voltage of 2.5V. It also has an adjustable output voltage ranging from 1.8V to 36V, making it an ideal choice for automotive applications. It has a maximum output current of 350mA and a maximum dropout voltage of 1.2V at full load. Additionally, it has an input voltage range of 4.5V to 36V and a minimum quiescent current of 10uA.

The device is designed to survive a 5V surge of up to 400ms and has an output disable function which can be used to reduce the power consumption when the device is not in use. The device is also protected by an over temperature protection circuit and an over-current protection circuit. Furthermore, the device is designed to have a low EMI noise, making it an ideal choice for automotive infotainment systems.

Working Principle

The SP317V2-L/TR is a linear voltage regulator that utilizes a feedback loop to control the output voltage and current. The feedback loop controls the output voltage by comparing the actual output voltage with the reference voltage set by the user. The output voltage is regulated by controlling the amount of current flowing through the pass transistor. This is achieved by the difference amplifier, which compares the differential inputs of the reference voltage and the actual voltage and adjusts the current through the pass transistor accordingly.

When the output voltage is lower than the reference voltage, the difference amplifier signals a conduction of the pass transistor, which causes an increase in the current flowing through the pass transistor. This will result in an increased output voltage to match the reference voltage. Similarly, when the output voltage is higher than the reference voltage, the difference amplifier signals an increase of resistance in the pass transistor, which causes the current to reduce and the output voltage to decrease.

The pass transistor is a PNP transistor and works as a common emitter with an emitter resistor. The emitter resistor forms the feedback loop, whose resistance is chosen to minimize the output ripple voltage and the output voltage tolerance over a wide range of operating conditions. The gain of the feedback loop is determined by the ratio of the reference and the output voltage, which is set by the user and can be adjusted according to the particular application.

In addition, the SP317V2-L/TR has a minimum quiescent current of 10uA and an under-voltage lockout protection circuit which protects the device from dropping to the wrong voltage. This protection circuit is activated when the supply voltage drops below a certain voltage level and signals the shutdown of the device. The device also has an over-temperature protection circuit which shuts down the device when the temperature exceeds a certain limit.

The SP317V2-L/TR is an excellent example of a linear voltage regulator with adjustable output and a wide operating range. It is designed to provide excellent electrical performance in automotive applications and is a perfect choice for providing a stable power source for automotive infotainment systems.

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