Sunday, February 25, 2024

Power Switching Reference Design For Set-Top Box

By Akanksha Sondhi Gaur

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Dive into the future of sleek, efficient media devices with a design that minimises space usage, enhances system efficiency, and ensures device longevity.

Set-top boxes (STBs), digital video recorders (DVRs), and other media or streaming devices are evolving to become more compact and streamlined, necessitating a design prioritising space efficiency. This reference design ensures that the load switch solution occupies minimal space, making it as compact and space-efficient as possible.

This reference design TIDA-01451 by Texas Instruments replicates the power distribution system found in set-top boxes (STBs), utilising integrated load switches to manage power rails. These switches allow for the activation or deactivation of each rail based on user requirements, enhancing energy efficiency by powering down unused rails. This contributes significantly to meeting energy compliance standards, like ENERGY STAR. Additionally, an eFuse at the input safeguards against hot plug transients and ensures the protection of downstream DC/DC converters from input voltages that are excessively high or low. This feature plays a crucial role in minimising the return rate of the end equipment by preventing damage.

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The product boasts a fully-featured PowerTree for common loads in Set-Top Boxes (STBs), enabling the precise selection of load switches and DC/DC converters during system design. It includes current limiting on the HDMI port to provide necessary protection for the 5-V rail, ensuring device safety and longevity. Switching off unused loads enhances system efficiency and reduces standby current, aiding in compliance with energy-saving requirements such as ENERGY STAR. Furthermore, including load switches results in a more compact solution size and a reduced component count compared to discrete MOSFET solutions, offering a streamlined and efficient design alternative. This product is ideally suited for Set-Top Boxes (STBs) and Digital Video Recorders (DVRs) applications. Its features are designed to enhance the performance and efficiency of these devices, making it a perfect fit for manufacturers looking to innovate and improve their product offerings in the digital entertainment and recording industry. This reference design achieves a standby mode power consumption of 50mW or less by turning off all the load switches while keeping the DC/DC converters active.

Texas Instruments has thoroughly tested this reference design, which includes a Design Guide, Bill of Materials (BOM), schematics, Gerber files, Printed Circuit Board (PCB) layout, and more. Please visit the company’s website for further information on this reference design. To explore this design in greater detail, click here.

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