NCV8509PDW18G

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NCV8509PDW18G Application Field and Working Principle

Linear voltage regulators are widely used in a variety of electronic devices. The NCV8509PDW18G is a low-dropout linear voltage regulator (LDO) with a wide input voltage range of 2.3V to 18V. It is capable of providing a regulated output of 1.8V with a maximum dropout voltage of 400 mV.

The NCV8509PDW18G is designed to be used in a wide range of applications, including portable devices, industrial or automotive applications. It is ideal for applications requiring extremely low quiescent current, such as battery-powered systems. It is also useful for powering low voltage logic circuits.

Features of NCV8509PDW18G

• High output current of 500 mA
• Input voltage range from 2.3V to 18V
• Low dropout voltage of 400 mV
• Low quiescent current of 10 uA
• High PSRR of 80 dB at 1 kHz
• Thermal shutdown, short circuit protection and reverse voltage protection

NCV8509PDW18G Working Principle

The NCV8509PDW18G works by using a voltage reference and an error amplifier to regulate the output voltage. The voltage reference is used to set the output voltage by providing a stable reference voltage. The error amplifier is used to compare the reference voltage with the feedback voltage from the output. The error amplifier then adjusts the output voltage to the desired level.

The main component in the NCV8509PDW18G is an N-channel MOSFET. The MOSFET acts as a switch that turns on when the input voltage is higher than the output voltage. When the switch turns on, current from the input is drawn through the MOSFET and into the load circuit, reducing the output voltage. The current is controlled by adjusting the gate voltage of the MOSFET using the error amplifier.

The NCV8509PDW18G also incorporates special protection features such as Over-Temperature protection, Over-Current protection, Reverse Voltage protection and Under-Voltage Lockout (UVLO). These safety features ensure the safe operation of the device in case of over-current or reverse polarity voltages applied to the input. The device can also be shut down by applying an externally applied logic signal.

Conclusion

The NCV8509PDW18G is a low-dropout linear voltage regulator ideal for battery-powered applications. It has a wide input voltage range and can provide a regulated output voltage of 1.8V with a maximum dropout voltage of 400 mV. The on-chip MOSFET, error amplifier and protective features ensure precise regulation and safe operation of the device. The NCV8509PDW18G is suitable for a wide range of applications, such as portable devices, industrial or automotive applications.

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