V375A28T400B

DC DC Converters

A DC to DC converter is an electrical circuit that steps up or steps down electrical voltage by converting direct current (DC) from one voltage level to another. There are two main types of DC to DC converters - linear and switch-mode. Switch-mode converters are the most common type, as they have higher efficiency and more features than linear converters.

V375A28T400B Application Field and Working Principle

The V375A28T400B DC to DC converter is a low-cost, high-efficiency step-down (Voltage Buck) converter with a switching frequency of 400 kHz. It is capable of providing output power up to 31.6 W over a wide input voltage range of 4.5V to 28V. It is ideal for applications requiring high efficiency and tight component size constraints such as industrial electronics, automotive, medical, and avionics. The device features an adjustable output voltage, adjustable current limit, accurate over-voltage protection, load disconnection and active current sharing.

In order to understand the working principle of a V375A28T400B, it is important to note that a switch-mode converter works by chopping up the input voltage into several switchable voltage levels. These chopped-up voltage levels are then converted into an output voltage by means of a transformer and a rectifier circuitry. The output voltage of the converter is then regulated by a control circuit.

The V375A28T400B has an autonomous voltage regulation technique, which works by comparing the output voltage to a reference voltage via an on-chip comparator. The comparator’s output is then used to adjust the frequency of the switching circuit so that the output voltage is regulated to the desired value. This technique is not only fast but also very efficient. The frequency of the switching circuits can be adjusted to suit the load and input source characteristics and for further efficiency gains.

The V375A28T400B also features a unique current limit circuit in order to protect the converter as well as the connected load. This current limit circuit maintains a critical current limit point at which the converter will limit the output current, even in the case of a short circuit or abnormal load conditions. The current limit point can be adjusted by means of an external resistor. Additionally, the converter also features an over-voltage protection circuitry which trips when the output voltage exceeds a reference voltage due to an increase in input voltage or due to a sudden increase in load current. This feature not only protects the load connected to the converter but also increases the converter’s overall reliability and lifetime.

The V375A28T400B also features a several parameters which can be adjusted to optimize its performance according to applications requirements. These include the input voltage range, the output voltage range, the output power, the frequency of the switching sections, and the current limit level. All of these parameters can be easily adjusted using an external resistor and/or capacitor network, allowing the converter to be tailored for specific applications and needs.

In conclusion, the V375A28T400B DC to DC converter is a high-efficiency, cost-effective device which offers a wide range of features such as adjustable output voltage, adjustable current limit, accurate over-voltage protection, load disconnection and active current sharing. It is ideal for industrial electronics, automotive, medical, and avionics applications. With its wide range of adjustable parameters, the V375A28T400B is a powerful device which can be easily tailored to suit any particular application requirements.