NCV8674DS120G

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NCV8674DS120G, known as an advanced, economical, and general-purpose linear regulator, is specific to Voltage Regulator application fields. This device, being part of the Linear Regulator family, provides a versatile combination of precision and transient performance with great supply-noise and output-ripple rejection, making it possible to put a product into various applications.

This device provides a wide input voltage range from 2.5 V to 21 V, with both fixed and adjustable output voltage range (1 V to 20 V). An integrated Shutdown function provided with logic compatible input controls, allows the device to put into low-power mode (limited input current equal or less than 1µA). Also, the NCV8674DS120G can provide as high as 9A load current.

The device also has short circuit protection (SCP) feature, which brings added protection to the outputs and helps to limit output current in the event of a short circuit. The CTR indicates the device switching frequency which is in the range of 100 kHz to 300 kHz.

Another way this device works well is in terms of its operating temperature range, which is from -55 °C to +150 °C, making it suitable for industrial, automotive and harsh environment applications.

The NCV8674DS120G is also well known for its working principle. It uses Pulse-Width Modulation (PWM) as a topology to regulate the output voltage. PWM is a circuit to control the output voltage by continuously switching between a fully on and a fully off state periodically. The ratio of the on time to the total period is adjusted to change the output voltage to the desired level.

The main principle of operation is as follows. The internal error amplifier offers an output voltage reference to the internal control circuitry. When the output voltage of the error amplifier is greater then the voltage at the feedback pin, the output of the PWM comparator is high. This causes the output switching transistor to be on and the inductor current to rise. When the voltage at the feedback pin is greater then the output of the error amplifier then the output of the PWM comparator is low causing the output switching transistor to turn off, and the inductor current to be recycled to the output. An internal current limiting control also helps to regulate total output current.

This device also makes it possible to have remote sensing, because an external resistor divider can be used to sense the voltage at the load. When the remote sensing is used, the device can be made more precise in the changes of load demand and output voltage.

The NCV8674DS120G is commonly used in computers, telecom systems, automotive, industrial, and other applications. With features like low drop out voltage, low power consumption, and high efficiency, this voltage regulator is ideal for most mainstream applications. Plus, this device, being part of the Linear Regulator family, will also provide over-voltage protection, input under-voltage lockout, and output over-voltage protection, making it ideal in terms of safety.

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