LM2575-12BU TR

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The LM2575 simple step-up switching regulator is a self-contained, high efficiency voltage-conversion, capable of driving a 2A load with excellent line and load regulation. This regulator can be used in wide range of applications, including low-voltage microprocessor systems, DC motors, and powering logic circuits. In this article, we will discuss the application fields and working principle of the LM2575-12BU TR.The LM2575 is a 1A monolithic switching regulator, having an operating frequency range of 500kHz-1MHz. It is a highly efficient and low noise switch-mode voltage regulator, with a wide input voltage range of 4V to 38V, and an output voltage range of 1.24V to 37V. This regulator also has low power dissipation and fast transient responses.The LM2575 starts operating on the supply voltage as soon as the input voltage reaches the under-voltage lockout (UVLO) threshold. The LM2575 has a wide range of features that make it ideal for a variety of applications. These features include current limit, thermal protection, enable input, and soft-start.The LM2575-12BU TR is specifically designed for applications where the output voltage is 12V. Since the LM2575 is a step-up regulator, the input voltage required to drive the regulator is lower than the output voltage. This means the input voltage should be at least 8V in order to maintain a 12V output.The LM2575-12BU TR has a built-in enable input to control the regulator\'s ON-OFF status. When the enable input is high, the regulator is in ON-state and when the enable input is low, it is in OFF-state. This feature is useful to control the output voltage, mainly in applications where an external supply is used for the system.The LM2575 also has an adjustable soft-start feature. This protects the circuitry from inrush currents. By varying the value of the soft-start capacitor, the inrush current can be controlled.The LM2575-12BU TR also provides a current limit output that limits the current flow through the regulator to the maximum rated current of 1A. A sense resistor, connected between the output and the sense input terminal, is used to limit the current. This provides safe and reliable operation in case of overcurrent situations, such as short-circuits or overloading of the output.Lastly, the LM2575-12BU TR provides thermal protection, which shuts down the regulator whenever the junction temperature exceeds the maximum allowed temperature. This is typically done by sensing the conditions at the IC package, but may also be done externally by connecting a thermistor to the thermal protection circuit.In conclusion, the LM2575-12BU TR is an efficient monolithic integrated circuit, suitable for various applications due to its features such as current limit, thermal protection, enable input and soft-start. With its wide input voltage range and low power dissipation, this regulator is ideal for low-voltage microprocessor systems, DC motors, and powering logic circuits.

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