LM2991 MWC

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Introduction

LM2991 is a monolithic integrated application specific circuit designed for the micro-wave (MW) applications. It provides reliable and highly efficient regulation of power supplies and provides power-level protection along with the circuits common ground connection. Combining the high performance protection circuits, robust boost and switching regulators, fast transient response and low power consumption, it is designed to meet the specific requirements of modern MW applications.

Application Field

The LM2991 MWC Application Field mainly encompasses linear voltage regulators and switching and boosting regulators. Linear voltage regulators can provide efficient power conversion, making them ideal for supplying basic system power requirements. They are especially suitable for MW applications, since they provide low output voltage ripple and steady output voltage, even when varying input voltage levels vary. The LM2991 MWC also provides switching and boosting regulators, which can supply a greater output voltage than the input voltage. This is especially useful in MW applications, where the available input voltage may not meet the desired current requirements.

Working Principle

The LM2991 MWC Working Principle is based on a linear voltage regulator with integrated protection logic. This logic monitors the power supply voltage and current to prevent over-voltage, over-current, and short-circuit conditions. In the event of an over-voltage or over-current condition, the circuit automatically shuts down and protects the device from any damage. The LM2991 MWC also provides a reset function, which activates the protection logic as soon as the system is powered up.

The linear voltage regulator works by applying a voltage to the input voltage through a potentiometer. This sets the regulator output voltage, and the regulator adjusts the output voltage to correspond with the input voltage. This allows the output voltage to remain relatively stable regardless of the input voltage. The output current is limited by a current sense resistor, and when the current rises above the design threshold, the circuit automatically shuts down to protect the regulator and its components.

The LM2991 MWC also provides two comparators, the primary comparator compares the output voltage with respect to the input voltage, and the second compare the output current with respect to the threshold set by the sense resistor. The input voltage can be boosted with the integrated boost switch, which enables the LM2991 MWC to supply higher output voltages than the input. This boosts switch is also protected by the protection logic, and it shuts down in case of any over-voltage or over-current conditions.

The LM2991 MWC also provides an oscillator that helps to reduce power consumption and improve the transient response of the regulator. This oscillator constantly adjusts the voltage and current through an adjustable duty-cycle control that synchronizes the power supply voltage with the output voltage.

The output of the LM2991 MWC is an adjustable voltage additional test point is provided to verify the output voltage.

Conclusion

The LM2991 MWC Application Field and Working Principle are designed to provide power efficient and reliable power supply for wireless microwave applications. With its integrated protection logic, robust boost and switching regulators, high-performance protection circuits, and fast transient response, it is the ideal device for these applications.

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