DC1740A-A

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The DC1740A-A is an evaluation board with DC/DC and AC/DC (off-line) SMPS capabilities. This board is able to evaluate power output, efficiency, and ripple features prior to product design. The DC1740A-A offers adjustable output voltage, high power density and low component count making it an ideal choice for under 100-W industrial adapters, telecom, and consumer applications.

The DC1740A-A is designed to be used as an evaluation board for a buck-derived topology, allowing designers to hastily evaluate their designs for further optimization. The board features a front end, based on a high-efficiency, minimum component buck-derived design. The DC1740A-A also features an onboard power supply, temperature sensor, protection circuitry, and an adjustable on-board output voltage from 0-40 V.

The DC1740A-A has two types of operation mode, namely continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In CCM, the transformer core can stay saturated for the entire switching period, whereas in DCM, the core is saturated for first part of cycle and then the transformer is unloaded. The advantage of CCM operation is its higher efficiency and lower output voltage ripple. However, higher input capacitance (due to large core size) and higher switching losses are drawbacks of CCM operation.

The DC1740A-A includes an onboard temperature sensor that can measure the temperature of the transformer\'s primary side and switch. This temperature sensor is used to provide feedback for control loop in order to maintain efficient and safe operation of the DC1740A-A.

The DC1740A-A can be used to evaluate the performance of buck-derived topologies for applications such as medical, industrial, telecom, consumer audio and video products, gaming, and USB applications. The board is also suitable for conducting experiments and testing the performance of different buck-derived topologies.

The working principle of the DC1740A-A can be broadly summarized in three steps. First, the primary side of transformer is supplied with rectangular waveform at switching frequency that is generated by the onboard oscillator circuit. This rectangular waveform is then stepped down and rectified by the secondary side of the transformer and fed into the output filter circuit. This output filter circuit reduces ripple voltage and increases output voltage stability. Finally, the output is fed into the control loop which adjusts the output voltage according to the feedback from the temperature sensor and comparator.

The DC1740A-A evaluation board offers superior performance and design flexibility. This board is easy to use and ideal for evaluation of high power DC/DC and AC/DC (off-line) SMPS. It is ideal for designers who are looking for a cost effective solution to evaluate and optimize buck-derived topologies.

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