ADM00423

The ADM00423 is a versatile evaluation board in the family of DC/DC and AC/DC (off-line) SMPS. This board, suitable for evaluation purposes, combines all the components necessary to produce a functional system for these two power supplies, with the exception of the transformer and radiation shields.

The function of the ADM00423 is to demonstrate the principles of operation and the performance of the switching regulator components by providing a detailed study of the power supply circuit. A representative power circuit is also included on the board, further demonstrating the utilization of the given design parameters. By setting up the board and verifying the operation of the regulators, a user can gain a better understanding of the critical factors of the system.

The ADM00423 board consists of the following critical components:

• DC/DC converter
• AC/DC converter
• Inductors
• MOSFET devices
• Capacitors
• Control ICs

DC/DC converter is also known as boost converter, SEPIC (single ended primary inductor converter) or CUK (constant-voltage constant-current) converters. The active parts of the converter may be operated in classical or continuous mode. The external components involved can modify the converter to be used as a buck-boost converter, providing the user with a general purpose item for low-power applications.

The AC/DC converter is a full-wave rectified half-bridge topology. It allows the user to investigate the start-up and operation of a very basic AC/DC SMPS. The presence of low power loss components maximizes the efficiency of the circuit.

Inductors and capacitors are the most common components present in a power supply system. The purpose of an inductor is to store energy in a magnetic field and absorb a surge in current under heavy load conditions. A capacitor is used to store energy in an electric field and to provide a continuous current flow.

MOSFET devices are semiconductor components used to regulate the flow of current through the circuit. They can be used to control the on/off switching of the power supply. The specific features of these devices, such as low on-resistance and low gate threshold voltage, allow for efficient operation.

Control ICs such as the MC34063 DC-DC converter, the MC33269 AC/DC converter, and the MC74ACT17806 zero-crossing detector, are present in the ADM00423. These devices are used to stabilize voltage variations, ensure soft start-up and control the size of the output waves.

The ADM00423 board integratlls the components necessary for implementing a DC/DC and AC/DC switched mode power supply system. With these components, the designer can conduct testing, evaluation and prototyping in a wide range of applications. Potential applications include: motor drives, telecom systems, embedded processors and power converters. Moreover, the versatility of the board allows the user to use it for a variety of other applications.

In conclusion, the ADM00423 board is a versatile evaluation board, suitable for evaluating and testing DC/DC and AC/DC (off-line) SMPS performance. Through its selection of components, the board allows for prototyping, testing and evaluation of a variety of power systems in various applications.