VTD48EH120T010B00

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Introduction: VTD48EH120T010B00 Application Field and Working Principle

The VTD48EH120T010B00 is a board developed for the evaluation of DC/DC and AC/DC (off-line) switch mode power supplies, featuring highly efficient and reliable components. The board contains all required components for an easy and effective evaluation of DC/DC and AC/DC (off-line) switch mode power supplies from 3W to 120W in a half-bridge circuit topology.

Designed specifically for applications with wide input voltages, the VTD48EH120T010B00 has an input voltage range of 70 – 300V AC and can deliver an output voltage of 48V DC at 10A. Additionally, the board is very fast (<1% settling time) and has a wide range of control functions including synchronous rectification, remote on/off control, current limiting, soft-start, power good indication, and overload protection.

Application Field

The VTD48EH120T010B00 is designed for a wide range of applications, such as industrial and commercial lighting, electrical and electronic equipment, and telecommunication systems. The board is particularly suitable for applications where wide input voltages and high power factor are required, such as ballasts for fluorescent and high-pressure mercury lamps, street lighting, security systems, and audio amplifiers.

Working Principle

The VTD48EH120T010B00 board works on the principle of converting the input power from AC/DC to a specified output voltage. It does this through the use of an insulated gate bipolar transistor (IGBT) switch operated by a control cir­cuit. This switch modulates the input AC/DC power and controls the amount of power delivered to the output. The output extends from 3W to 120W depending on the input voltage.

The basic circuit consists of the rectifier, IGBTs, LC filter, drive transistors, and control circuit. The rectifier converts the AC power input into DC power. The two IGBTs operating in half-bridge switching mode then convert the DC power into the desired output voltage. An LC filter is placed after the switching transistors to smooth out the output voltage while blocking high frequency noise.

The drive transistors are used to provide the necessary gate drive for the insulated gate bipolar transistors (IGBTs). The control circuit, which can be either a microprocesser or programmable logic controller (PLC), is used to control the switching frequency of the gates. Furthermore, the control circuit provides added safety features such as overload protection, soft start, output shut down, and thermal protection.

Conclusion

The VTD48EH120T010B00 evaluation board is designed to implement a highly efficient and reliable DC/DC and AC/DC (off-line) switch mode power supplies from 3W to 120W. It is suitable for various applications including industrial and commercial lighting and audio amplifiers. The board works on the principle of converting the input power from AC/DC to a specified output voltage using a rectifier, two IGBTs in switching mode, an LC filter, drive transistors, and a control circuit.

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