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DC DC Converters

DC-DC converters are electronic components that convert direct current (DC) electrical energy from one form to another. DC-DC converters are ubiquitous in modern electronics for a variety of applications from power supplies, to battery chargers, and other power conversion circuits. The popularity of these components is due to their ease of use, efficiency, minimal electrical noise, and power dissipation.

AVO250-48S28B-6L Application Field and Working Principle

AVO250-48S28B-6L is a wide input range, high power density DC-DC converter that features an automatic input voltage selectable from 10 to 48VDC. It provides an adjustable output voltage from 0.4 to 30VDC and a maximum output current of 28A. The part is designed to meet the harsh environments found in industrial automation, transportation, avionics, automotive and telecom applications.

AVO250-48S28B-6L is based on a switching regulator topology. In this design, the output voltage is regulated by switching an access amount of input voltage with an inductor in different duty cycles. The switching frequency must be sufficiently high enough so that the inductor ripple current can be kept at a minimum and thus an optimal conversion efficiency is achieved.

A controller regulates the output voltage by controlling the switching frequency and duty cycle of the power switch. The control circuit is integrated in the circuit, allowing the device to operate without any external components. The control circuit also has features such as short-circuit and over-temperature protection, as well as soft start and variable input voltage capability.

The AVO250-48S28B-6L is also designed to provide a low standby current and low no-load power consumption, improving efficiency in low power applications. Furthermore, the converter has a high junction temperature rating of up to 105°C, enabling its use in demanding applications.

Power conversion efficiency is a key performance parameter. It is defined as the ratio of output power to input power. AVO250-48S28B-6L achieves a high efficiency, up to 93%, under various combinations of input and output voltages. This high efficiency, coupled with low intrinsic power dissipation, allows for use in space-constrained systems.

Finally, the AVO250-48S28B-6L provides excellent electromagnetic interference (EMI) performance. It has low EMI characteristics in compliance with the most stringent industry standards, allowing its integration in both noisy and quiet environments.

In summary, AVO250-48S28B-6L is a DC-DC converter that offers a wide input range, a high power density, adjustable output voltage, high conversion efficiency, low EMI performance, and excellent reliability.

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