VE-26K-EU-S

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Introduction to DC DC Converters

DC-DC converters are devices used to convert electrical power from one form of circuitry to another. DC-DC converter is basically an efficient power stage used to produce low voltage DC outputs from a pooled DC source. The most common type of DC-DC converters are buck, boost and buck-boost converters. We will be focusing on the buck converter, its operation, and discuss the application field of VE-26K-EU-S, a specific model of the buck converter.

What is a Buck Converter?

A buck converter is a DC to DC converter which steps down the input voltage to a lower output voltage. It is the most basic type of DC-DC converter in the buck family. It works by connecting the source voltage to a switch, which is then connected to a diode, an inductor, and a filter capacitor. The switch is then used to create a controlled series of pulses, which then produce the required lower output voltage.

Buck Converter Working Principle

The working principle of a buck converter can be simplified into a few steps. To start off with, a switch is used to connect the input voltage to an inductor. When the switch is closed, the energy is stored in the magnetic form in the inductor. This magnetic energy is then discharged to the output when the switch is opened. When the switch opens, the diode, which is connected in parallel with the inductor, acts like a short circuit, forcing the inductor to pass the output to the output filter capacitor. This forms a basic buck converter circuit.

VE-26K-EU-S Application Field and Working Principle

VE-26K-EU-S is a small size DC to DC buck converter used to convert the input voltage range of 4.5V to 28V to an adjustable output voltage ranging from 0.7V to 21V. It is typically used in a variety of industrial and automotive applications including LED lighting drives, vehicle power supplies, and many more. It has an input current of up to 5A, a low on-threshold voltage of 200mV and internal current limit protection of 6A.

The VE-26K-EU-S adopts a synchronous buck design, which achieves lower on-threshold voltage and better noise performance than a conventional buck converter. It uses two MOSFETs, one to control the switching action and the other to enable current path when the switching MOSFET is turned off. The switching MOSFET is triggered by an internal linear controller, which turns the switching MOSFET on and off.

To maximize efficiency, the VE-26K-EU-S also comes with a wide input voltage range detection scheme, which allows the linear controller to properly optimize the operation of the converter according to the input voltage and the output current. The linear controller provides a high frequency, fixed frequency control method, segmented voltage control, constant on-time, and modified constant on-time control.

Conclusion

The VE-26K-EU-S is a small size DC to DC buck converter used in a variety of industrial and automotive applications. It uses an efficient synchronous buck design, which provides a low on-threshold voltage, minimal noise and maximum efficiency. The internal linear controller provides a high frequency, fixed frequency control method, segmented voltage control, constant on-time, and modified constant on-time control to achieve optimal operation of the converter.

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