VI-22K-MX-F4

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DC-DC converters have become integral components of various electronic systems over the years, thanks to their ability to efficiently convert electrical power from one level to another. The VI-22K-MX-F4 is one such converter designed for use in distributed power applications, such as aircraft, spacecraft, and telecommunication systems. This article will explore the features and working principle of the VI-22K-MX-F4 DC-DC converter for its application field.

Overview

The VI-22K-MX-F4 is a topology doubler and buck integrated circuit (IC) that is used to convert its input voltage from a range of 6 – 22VDC to output voltages up to ± 48 VDC. It has a very wide input voltage range with a high current rate of 10A. The VI-22K-MX-F4 provides a maximum efficiency of 85% and a switching frequency of 250kHz.

The VI-22K-MX-F4 has a low output voltage ripple of 0.5% and an adjustable output voltage range from 8V to 46V. It also ensures a high light load efficiency of up to 90% when used with input voltages of 15V DC. In addition, the IC includes under-voltage protection and over-temperature protection against short circuits and overloads.

Features

The VI-22K-MX-F4 is designed to offer comprehensive protection against overloads, short circuits, and over-temperature operation. It has an internal current limit with protection against unexpected inrush currents on the input. This prevents overloading of the power supply and possibly damaging the load. In addition, the VI-22K-MX-F4 also provides under-voltage protection with detection of low input voltage levels.

The VI-22K-MX-F4 has an adjustable power-on delay of up to 10s as well as a soft-start mode to reduce the in-rush current on the input side. The IC also features low-noise operation with a high switching frequency of 250kHz. This eliminates external EMI filters, thus reducing the system cost and complexity.

Applications

The VI-22K-MX-F4 converter is an ideal solution for distributed power applications such as aircraft, spacecraft, and telecommunications systems. Its wide input voltage range and high current rate make it suitable for high-voltage power supplies, ensuring reliable and efficient power conversion. The high frequency of operation and adjustable output voltage range make the VI-22K-MX-F4 an excellent choice for applications with limited space. Additionally, its integrated protection features allow for increased reliability and longer device lifetime.

Working Principle

The VI-22K-MX-F4 converter follows the buck topology. This involves a power transistor switches connected to the input voltage. The input voltage is switched on and off by the power transistors to achieve a certain output. The output voltage is then regulated using an internal voltage reference and a feedback control loop.

The VI-22K-MX-F4 IC also contains a PWM control circuit and driver that limits the time period for which the power transistors conduct. It also enables synchronized operation of multiple devices. The PWM cycles are controlled by an external clock with a frequency range of 0.5-2.5 kHz. The clock can be synchronized with the power source to reduce switching losses.

Conclusion

The VI-22K-MX-F4 is a DC-DC converter that is designed for use in distributed power applications, such as aircraft, spacecraft, and telecommunication systems. It has a very wide input voltage range with a high current rate of 10A and a maximum efficiency of 85%. The VI-22K-MX-F4 also provides under-voltage protection and over-temperature protection against short circuits and overloads. The PWM control circuit and driver enables synchronized operation of multiple devices.

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