LM2576D2T-012

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The LM2576D2T-012 is a voltage regulator known as a DC-DC step-down switching regulator. It is a voltage regulator module (VRM) used to regulate the voltage input of power supplies and terminate an output which is a lower, more precise voltage than the input. The LM2576D2T-012 is typically used in embedded systems such as mobile phones, computers, and automobiles.

The LM2576D2T-012 is classified as a step-down regulator because it takes in a higher voltage, usually greater than 5 volts, and reduces it to a precise output voltage. It is usually used to create 3.3V or 5V outputs from a 12V or greater input. The module also features a range of features such as a current mode regulation, enabled by dedicated sensed voltage on its BST pin or differential remote sensing, allows ripple to be reduced at low stands significantly.

The LM2576D2T-012 has an input voltage range from 4.75V to 40V and an adjustable output voltage down to 0.8V with ±4% accuracy. The maximum load current is up to 3A and the peak switch current is up to 6A. The LM2576D2T-012 also has an internal circuit that limits the in-rush current at the start-up, enabling a fast and safe start-up even with heavy capacitive load as well as output voltage trim capability for different applications.

The LM2576D2T-012 works on the principle of pulse width modulation (PWM) regulation. It harnesses the power of a voltage comparison between an internal reference voltage and the current output voltage. When the output voltage is lower than the set or reference voltage, an internal oscillator triggers the PWM to close the power switch, allowing power to be transferred to the output capacitor, resulting in an increase in the output voltage.

The LM2576D2T-012 also features an enable pin, which makes it suitable for applications requiring an additional control signal to enable or disable the output, such as off line power supply control. Additionally, a power good signal available on the output can signal the presence of valid output and can be used for programmable delay time before switching on power output after the enable is triggered.

The LM2576D2T-012 contains built-in protection circuits to avoid permanent damage caused by output over current, thermal alert, thermal shutdown, output over-voltage protection and reverse current flow from the output. Moreover, the module contains current limited circuitry and a regulated frequency oscillator for better noise-filtering. The frequency range can be selected by a single resistor through a 500kHz to 2.2MHz range and optimized for efficiency in light load conditions.

The LM2576D2T-012 is a versatile and efficient step-down voltage regulator that has a wide range of applications in embedded systems. It is designed to be robust and reliable, while at the same time providing high levels of power efficiency. Its low voltage and current protection circuits, integrated enable signal and power good signal, enable it to be used in a wide range of applications.

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