NCP551SN32T1G

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NCP551SN32T1G is a linear voltage regulator from ON Semiconductor. It is a low drop out three-terminal positive voltage regulator with built in protection against overcurrent and overtemperature. It is designed for low power supplies for both fixed and adjustable output. It can also be used for portable electronic applications that requires low power consumption and low cost.

The NCP551SN32T1G is capable of supplying up to 400mA and can generate an output voltage from 1.2V to 5V. It has an adjustable and fixed output voltage version. The operating voltage ranges from -40°C to 125°C and it needs a minimum input voltage of 1.5V. It also has several key features such as built-in EMI filtering, high common-mode rejection and current protection.

In terms of application field, the NCP551SN32T1G is widely used in power management devices and low power applications such as battery powered amplifiers, digital cameras, portable devices, and medical instrumentation. It is suitable for both single and dual rail designs.

The working principle of the NCP551SN32T1G can be divided into two main parts - the Output stage, and the Self-Biasing circuit for current protection. In the output stage, the NCP551SN32T1G internally uses two transistors, a current mirror and an output transistor. The output transistor is controlled by feedback voltage from a voltage divider network connected to the output pin.

The Self-Biasing circuit provides the current limiting protection feature. The current protection is based on the startup current, which is fixed. When the device operates at a high load, the current increases and this increases the temperature of the device. As the temperature rises, the voltage at the lower end of the startup circuit also rises, which is sensed by the device, and if this voltage is above a certain threshold, the device automatically shuts off. The control loop also provides us with protection against short circuit and over voltage.

To summarize, the NCP551SN32T1G is an ideal choice for low power applications and devices requiring low dropout current and temperature protection. It features an adjustable and fixed voltage output and is suitable for single and dual rail designs. Its working principle comprises of an output stage and a self-biasing circuit for current protection.

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