MAXREFDES112B#

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The MAXREFDES112B# evaluation board is an off-line (DC/DC or AC/DC) switch mode power supply (SMPS) board. It comes with a number of features to simplify the evaluation and design of new power supplies. It is suitable for use in a variety of sectors such as industrial, medical, railway, and transportation.

The core of the MAXREFDES112B# board is the MAX5444M+ controller, which integrates a precision SMPS controller, a power-on reset function, and a SMPS driver in a single package. It operates in current mode and is suitable for implementing control loops with up to 10% midpoint accuracy. It can be powered from a wide input range from 85VAC to 265 VAC with a programmable frequency range of 45 kHz to 100 kHz, making it compatible with the MAXREFDES112B# evaluation board.

The MAXREFDES112B# evaluation board comes with a number of features for simplifying the evaluation and design of a power supply. It includes an isolated load supply, a power-on reset function, SMPS driver and soft start functionality, as well as current-mode operation. The board also includes two test points on the board to measure the output voltage and current, so that the output can be monitored during actual operation.

The board’s output voltage can be programmed from a range of 0 to 20 volts with an accuracy of 1%. It also has a built-in voltage, current, and temperature monitoring and protection circuitry to provide protection from over-current and over-voltage conditions. Additionally, the board supports EMI/EMC pre-compliance tests and offers an isolated transformer to reduce conducted emissions.

In terms of its working principle, the MAXREFDES112B# is based on a single-pole, double-throw (SPDT) switch which is connected between the AC input and the load. When AC input is applied, a voltage is induced in the transformer primary winding, which is then stepped down or up (depending on the type of SMPS) by the transformer secondary winding. The transformer is also connected to the power device, which is typically a MOSFET. The power device is controlled by the MAX5444M+ controller, which is responsible for setting the output voltage, current, and frequency.

When the power device is not turned on, no current can flow through the transformer and the output of the MAXREFDES112B# remains at zero. When the power device is turned on and a dc voltage is applied across the primary winding, the winding voltage increases and is stepped down or up by the transformer’s secondary winding, resulting in a dc output voltage on the MAXREFDES112B# output.

Finally, the MAX5444M+ SMPS controller implements the closed-loop control of the output voltage and provides the necessary protection functions, such as over-current and over-voltage protection, voltage and current monitoring, soft start, input power monitoring, and fault reporting. It therefore provides a flexible platform for designing and evaluating a wide range of SMPS applications.

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