LM2575HVT-15

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The LM2575HVT-15 is a high voltage step-down switching regulator with a wide input voltage range. The device has an internal 150mA, 150V N-channel MOSFET switch, allowing for up to 15V to be regulated through a high power dissipation MOSFET. The device is capable of providing an output voltage from 3V to 15V and a maximum output current of 150mA. The device also features short-circuit protection, over temperature protection, low quiescent current, and an adjustable current limit. This makes it well suited for applications such as automotive lighting, portable heart rate monitors, and battery operated devices.

The LM2575HVT-15 operates through a typical Pulse Width Modulation (PWM) control scheme. The pulse width of the output is proportional to the input voltage via a feedback loop using an internal error amplifier. The amplifier compares the output voltage to a preset reference voltage and adjusts the duty cycle of the output voltage accordingly. The frequency of the oscillator can also be changed by an external capacitor, allowing for a various compliance with different input and output combinations. Furthermore, the internal current limitation circuitry allows the device to be used in applications where a current limit must be set.

The main features of the LM2575HVT-15 make it well suited for applications requiring efficient operation in applications having high power dissipation requirements. For example, automotive lighting, automotive starter, and charger applications require high efficiency and long-term reliability due to their powered by DC supplies. Additionally, the adjustable current limit and low standby current makes the device well suited for portable and battery operated applications.

For applications in which noise sources are present and a linear regulator cannot be used, the LM2575HVT-15 offers a combination of high efficiency with good noise immunity and a wide input voltage range. When compared to linear regulators, switching regulators provide much higher efficiency because they only need to dissipate a fraction of the power of a linear regulator. Additionally, the LM2575HVT-15 delivers excellent line and load regulation, providing stable output voltage even when input voltage changes significantly and when the output current changes drastically.

In summary, the LM2575HVT-15 is a high performance, high efficiency, DC-DC switching buck regulator, suitable for applications requiring high input voltage range and high power dissipation. Its features include a wide input voltage range, adjustable current limit, and excellent efficiency, making it suitable for automotive lighting and portable medical applications. Furthermore, its short-circuit protection and over temperature protection ensure it is stable even under full load conditions.

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