LM25576QMHX/NOPB

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The LM25576QMHX/NOPB is a DC to DC switching regulator from Texas Instruments. This voltage regulator offers a non-isolated, adjustable step-down (buck) converter with a wide input voltage range of 6 V to 100 V. It is specified to operate up to an ambient temperature of 105 degrees Celsius, and offers a wide output current range of 0.5 amps to 6 amps. The LM25576QMHX/NOPB is designed with an integrated high-efficiency power train and high side and low side power MOSFETs. To provide highly accurate power with low output noise, the high-side current sense element has low-offset, low-bias current capability.

This DC-DC regulator provides up to 98% efficiency across the entire input voltage and output current range.The LM25576QMHX/NOPB also has a programmable switching frequency, adjustable soft-start current limit, adjustable loop compensation, an enable pin and thermal shutdown support with a programmable delay. It includes protection against over-current, over-temperature, short-circuits, and under-voltage lockout.

It is suitable for a wide range of applications including automotive, industrial, computing, communications, and instrumentation systems. Some common uses for the LM25576QMHX/NopB include power supplies for digital TVs, PLCs, security systems, and other electronic circuits that require varying voltages and current levels.

The working principle of the LM25576QMHX/NOPB is based on a buck-boost converter, in which it steps down (or up) the voltage depending on the load. When there is an overload, the converter senses this and then switches to a buck (step-down) mode to reduce the output voltage. Similarly, when there is an underload, it switches to a boost (step-up) mode to increase the output voltage.

The high side and low side power MOSFETs are used to form the power train of the LM25576QMHX/NOPB which controls a series of switching cycles with controlled on/off times. This arrangement enables a smooth and continuous power supply to the load. During these switching cycles, the current sense element is used to monitor the output voltage and compare it to the programmed voltage. The power train then adjusts the ratio of on and off times in order to maintain the desired output voltage.

Overall, the LM25576QMHX/NOPB is a highly efficient, low noise, step-down voltage regulator designed for a wide variety of commercial and industrial applications. It offers an adjustable output voltage and current and protection against over-current, over-temperature, short-circuits, and under-voltage lockout. The high-side current sense element allows for accurate power delivery and the programmable switching frequency provides flexibility in power supply design.

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