VI-25F-EX-F3

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DC-DC converters are vital components of modern power supplies. They are used to extend the capabilities of electrical systems to convert a single DC voltage to another with a precision that exceeds what’s achievable with mechanical or analog systems. Today, they are commonly used in applications such as telecommunications, computers, audio, medical, military, and automotive industries.

VI-25F-EX-F3 is a DC-DC converter developed by Vicor Corporation. It is a modern high-efficiency converter that allows power resolution down to 0.1V. It is designed to meet the needs of electrified vehicle electronics applications such as DC-DC on-board chargers, energy storage systems, and other automotive systems.

VI-25F-EX-F3’s application field covers a wide range of fields including telecommunications, information technology, automotive, and industrial control systems. It is suitable for basic power switch and voltage conversion applications. With a wide-input voltage range of 42V to 191V (up to 225V) and a high surge capability of 4.5kW, it can be used to power a variety of devices with different power requirements.

The working principle of the VI-25F-EX-F3 is based on step-down DC-DC conversion. It uses an inductor and a FET switch connected in series to step down the input voltage. A diode connected in parallel with the inductor acts as a current path for current flowing back to the input terminal. The FET switch is controlled by a pulse-width modulation (PWM) signal, which regulates the on-off times of the FET switch to allow or deny current flow from the input to the output.

The chip features two built-in current loop controllers and an adjustable output voltage reference to achieve accuracy and reliability during operation. The input voltage is sampled and compared with the reference voltage to adjust the duty cycle of the PWM signal. This in turn adjusts the voltage at the output terminal. With the wide input voltage range and precise resolution, the chip can easily achieve multiple power ratings.

The chip has a power down mode for convenient system power management. It shuts off the output when the output is deactivated, and the input voltage below 10V will also trigger the shutdown mode. Additionally, a synchronization pin is available to synchronize the frequency of the PWM signal with external devices. This can be used to reduce the standby power consumption of the device.

The VI-25F-EX-F3 has many safety features such as soft-start, current and temperature protection. With its integrated design, it is a reliable and efficient solution for electrified vehicle electronics applications.

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