NCP512SQ22T2G

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The NCP512SQ22T2G is an adjustable three-terminal shunt regulator IC with an input voltage range of 2.7V to 22V and an output voltage adjustable from 0.2V to 20V. It is commonly used in a variety of applications such as standby power supply, electric vehicle power supply, energy-saving device power supply, notebook power supply, and power management system. This linear regulator IC is part of a family of devices from ON Semiconductor that provides enhanced functions, stability and reliability.

Features

The key features of NCP512SQ22T2G are:

• Input voltage range of 2.7V to 22V
• Output voltage adjustable from 0.2V to 20V
• Output current up to 0.25A
• Operating Frequency up to 1MHz
• Low quiescent current
• Low dropout
• Low noise
• Short-circuit protection
• High PSRR
• High efficiency
• Stable in temperature, line and load variation

Applications

• Standby power supply
• Electric vehicle power supply
• Energy-saving appliance power supply
• Notebook power supply
• Power management system

Working Principle

The NCP512SQ22T2G is a linear regulator IC that works by controlling the input voltage to a fixed output voltage through a series of resistors. If a load is applied to the output, the voltage drop across the resistor causes a current to flow through it to the input voltage, the output voltage is thereby regulated. When the input voltage is greater than the output voltage, the excess voltage is dissipated as heat. As the voltage drop across the resistor increases, so does the amount of current drawn from the input source, resulting in an increase in power loss and efficiency.

The output voltage is regulated by adjusting the feedback voltage by adjusting the voltage divider composed of resistors connected between the output and the feedback node. This voltage divider is designed to draw a certain amount of current that is proportional to the output voltage. The current is then fed back to the input port through a control circuit, controlling the output voltage by adjusting the feedback voltage level.

The device also includes over-voltage and over-current protection functions. When an output voltage overshoot occurs or the current drawn from the output port exceeds an acceptable level, the device will disable the output port and enter into a protective state until the fault has been resolved and the device is reset.

Conclusion

The NCP512SQ22T2G is an adjustable three-terminal shunt regulator IC with an input voltage range of 2.7V to 22V, an output voltage adjustable from 0.2V to 20V, and an output current of up to 0.25A, making it ideal for a variety of applications such as standby power, electric vehicle power, energy-saving appliance power, notebook power, and power management system. Additionally, the IC features low-noise, high-PSRR, high efficiency, and short-circuit protection characteristics as well as over-voltage and over-current protection functions.

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