L7818CT

Introduction

The L7818CT is an 800V linear voltage regulator specifically designed for power management and other applications. It has a very low output dropout voltage relative to its input. The device also has a wide range of output voltage options, with adjustments to the voltage possible through an external resistor. The L7818CT is also highly durable and has a low output noise and a high ripple rejection. The integrated protection features include under voltage lockout (UVLO) and thermal-overload protection (TOS).

Application Fields

The L7818CT is suitable for use in applications such as Power supply, Industrial and Consumer electronics, Automotive applications, Medical equipment, Communications and Networking equipment, Smartphones and Mobile, Home security and surveillance systems, Security systems, Outdoor lighting and LED lighting applications. It is also used for applications such as motor control, battery charging, and power monitoring and control. Additionally, due to its low Dropout voltage and high reliability, the L7818CT is the ideal choice for derivative voltage circuits.

Working Principle

The L7818CT is a three-terminal device that works by providing a regulated output voltage on the Vo pin, while the VIN pin is connected to the input voltage. The logic pin is connected to the Enable pin and is used to control the regulator. When the EN pin is set to low, the regulator is disabled and the output voltage is set to 0V, the output will be enabled by setting the EN pin to high. The output voltage can be set by changing the resistance of the external resistor connected to the ADJ pin, which adjusts the settings of the regulator. The device also has a PWROK pin which informs the system when the output voltage is stable.

The device also utilises integrated protection features, such as thermal overload protection (TOS) and under-voltage lockout (UVLO). The TOS protection feature is used to protect the device from faults due to excessive current draw, by limiting the junction temperature. The UVLO feature is used to protect the device from overloads due to an insufficient input voltage. The device also has a high ripple rejection and low noise, which further enhances its reliability and performance.

Conclusion

The L7818CT is a versatile and reliable linear voltage regulator designed for power management, power supply and other applications. It has a low dropout voltage relative to its input, which makes it ideal for derivative voltage circuits. The device also has a wide range of output voltage options, with adjustments to the voltage possible through an external resistor. Additionally, the L7818CT has integrated protection features such as thermal overload protection (TOS) and under-voltage lockout (UVLO), as well as high ripple rejection and low noise, allowing for durable and reliable operation.