ZUS1R54815 Power Supplies - Board Mount

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DC-DC converters provide voltage conversion from a higher voltage level to a lower one or from a lower voltage level to a higher one, thus enabling control over the power delivered to a device in an efficient and effective manner. The ZUS1R54815 is an example of a DC-DC converter which provides rated currents up to 15A and output voltages ranging from 2.5V to 5.5V. It is suitable for a wide range of applications, including automotive, industrial and DC-bus systems.

The ZUS1R54815 is a DC-DC synchronous rectifying buck converter operating at up to 5.5V output and 15A at 600kHz frequency. It is based on a peak current-mode control topology with voltage feed-forward. This provides fast transient response and dynamic accuracy, thus protecting both input and output voltage from over voltage risk.

The device is also feature-rich, providing programmable current limit, automatic power saving when the load is less than 20% of the maximum output current, thermal shutdown protection, under voltage lockout, and output discharge which will discharge the output after shutdown. It also has a floating power stage to output negative voltages. The ZUS1R54815 is available in a thermally enhanced 4-pin HSOP-16 package.

The working principle of the ZUS1R54815 DC-DC converter is based on the concept of peak current-mode control. When a positive going signal is applied to the input, the positive switching of the power switches leads to an increase of the output. By controlling the timespan over which this voltage is increased, and thus the current ramp duration, the current in both the output and the source is regulated at predefined levels. The peak current-mode control is enabled by a proprietary switching waveform and requires an input capacitor to ensure sufficient voltage. During operation the inductor current is monitored and compared to a reference voltage. The difference between these two values is then used to generate an error that in turn controls the duty cycle of the converter. By adjusting the time for which the power MOSFET is in conduction mode, it is possible to achieve the required output voltage.

The ZUS1R54815 DC-DC converter is suitable for a range of applications, from automotive power systems to DC-bus systems. It is a robust, cost effective and efficient means of providing voltage conversion and control over power delivery. Its peak current-mode control with voltage feed-forward ensures fast transient response and accuracy, while its feature-rich nature provides protection against over-voltage risks and other damage. It is available in a thermally enhanced 4-pin HSOP-16 package, making it suitable for even space-constrained applications.

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