TPS54494EVM-057

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The TPS54494EVM-057 is a complete power system solution for an offline converter. It is a 200 to 400W evaluation board that includes Texas Instruments\' TPS54494 synchronous buck DC/DC converter. The TPS54494 is a high current, high efficiency controller for non-isolated DC/DC conversion. The board is capable of providing voltages from 0.8V to 3.3V with ±2% load and line regulation across a range of input voltages from 90 to 132Vrms (85 to 264Vac). The device features current-mode control, an adjustable switching frequency, and two enable pins for power sequencing. In addition, adjustable soft-start, under-voltage lockout, and over-voltage protection features are included in the design. The TPS54494EVM-057 also includes an adjustable, conduction-mode valley-fill circuit and external compensation circuitry to further improve system performance.

The TPS54494EVM-057 is specifically designed for use in high power, low voltage point-of-load (POL) applications such as telecom and datacom equipment, graphics cards, battery packs, and FPGA/AS ICs. The design aims to reduce external component count and to simplify the board area and assembly. In addition, the board features an onboard connector for connecting an external auxiliary power supply. This allows the user to configure the TPS54494EVM-057 to deliver two-rail power for high current applications in a point-of-load configuration. Other features such as adjustable current limiting, adjustable remote sensing, and multiple output options make the TPS54494EVM-057 suitable for a variety of applications.

The TPS54494 is a high current, synchronous buck DC/DC controller that operates at a constant switching frequency. It is specifically designed for high power applications and is capable of delivering up to 400W of DC output power from a non-isolated DC input. The part is optimized to have a high efficiency over a wide input voltage range due to the minimum number of external components required. Furthermore, the controller incorporates a variety of user-programmable features such as adjustable soft-start, under- and over-voltage protection, current-mode control, adjustable switching frequency, and two enable pins for power sequencing.

The TPS54494EVM-057 is also equipped with an adjustable conduction-mode valley-fill circuit. This feature enhances system efficiency at light loads and provides improved response to transients.In addition, the board includes external compensation circuitry to further improve performance. This includes a programmable unity-gain bandwidth allowing users to tune the controller for fast transient response or improved load regulation. Also incorporated into the design is a wide input tolerance that provides an acceptable operating voltage range of 85 to 264VAC.

The TPS54494EVM-057 is the ideal evaluation board for designers who require a high current, synchronous buck DC/DC power solution in a non-isolated configuration. The board offers adjustable current limiting, adjustable remote sensing, and multiple output options making it well suited for a broad range of applications in the telecom, datacom, battery pack, graphics, and FPGA/ASIC markets. By simplifying the board area and component count, the board offers improved system reliability and higher efficiency. Its comprehensive features and flexible design make it an optimal choice for development, testing, and evaluation.

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