LM2576T-5.0

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LM2576T-5.0 is a cost-effective, high-efficiency DC-DC step-down regulator. It is targeted at low power distributed power systems. The device provides a 10A minimum load current and an adjustable output voltage ranging from 0.8V to 5V with a typical efficiency of up to 93%. LM2576T-5.0 includes a wide range of built-in protection features, such as adjustable over-current protection, adjustable over-temperature protection, and short circuit protection.

LM2576T-5.0 is designed to be used in a wide range of applications such as high-current, portable systems, and cost-sensitive applications. The device is widely used for wireless communications, automotive, and consumer electronics. It can also be used for driving DSPs, FPGAs, ICs, USB ports and other sensitive portions of an application.

The LM2576T-5.0 includes an integrated wide input voltage range from 6V to 40V, making it suitable for various applications. The device also includes programmable soft-start, increasing the startup current limit for better inrush current control. The PWM control circuit also offers two selectable fixed frequency of 100KHz and 200KHz, allowing for improved system efficiency.

The working principle of LM2576T-5.0 is based on a Buck converter topology. The buck converter operates in the first stage by regulating the forward or cycle-by-cycle control of the MOSFET switch. The forward current is strictly controlled by the VOUT sense feedback. The sensed feedback value is compared to the internally generated PWM regulation voltage, to initiate the MOSFET switching action. The output voltage is determined by an internal resistor divider and is adjustable by an external resistive divider. The device also takes into account the finite switching times of power MOSFETs to avoid possible shoot through, overshoot and ringing in the output.

The device includes a 1.2 μs current limit circuit for providing maximum peak current protection. When the current limit is triggered the device goes into a slow-start condition and then re-starts the process. Thermal shutdown circuitry is included for over-temperature protection.

In summary, the LM2576T-5.0 DC-DC switching regulator is a cost-effective and high-efficiency device with a wide input voltage range and adjustable output voltage. The device also provides a range of protection features such as current limit and over-temperature protection. Furthermore, the integrated PWM control provides two selectable fixed frequency options, which improves system efficiency. The device is suitable for a wide range of applications such as wireless communications, automotive and consumer electronics.

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