NCV551SN50T1G

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The NCV551SN50T1G is a device from the NCV55XX family of linear voltage regulators from ON Semiconductor. This family of voltage regulators is designed to provide a regulated output of a range of voltages for a variety of consumer electronics and lighting applications. The family of devices provides two output voltage options of either 5.0V and 6.0V, and can operate at up to 1A with a typical dropout voltage of 1.2V.

The NCV551SN50T1G consists of an internal voltage reference, an internal error amplifier, an internal current limit circuit, an automatic thermal shutdown circuit, and an oscillator. The integrated regulator is enabled using a logic level input and remains enabled until a power-down signal is applied. The output voltage is typically adjustable over a range of 0.5V using an external voltage divider. The maximum output current of the device is limited to 1A without the need for an external current limit circuit.

The output voltage is regulated by two control mechanisms. The first is the error amplifier, which will control the output voltage such that it always maintains the same difference from the reference voltage. The second is the current limit circuit, which will limit the maximum current draw from the output of the regulator. The internal error amplifier and current limit circuit work together to ensure that the output voltage is always stable and regulated, even when the load conditions change. The Automatic Thermal Shutdown (ATS) circuit will disable the regulator if the junction temperature becomes too high, allowing the device to protect itself from thermal runaway.

The NCV551SN50T1G is a great device for a variety of applications which require a regulated output voltage of either 5.0V or 6.0V. Common applications for this device include LED lighting systems, battery powered portable devices, automotive electronics, and AC/DC power supplies. This device is well suited for these applications due to its low dropout voltage, high current capability, integration of many features, and the fact that it does not require an external current limit circuit.

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