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What’s in the box

Lowering the cost of powering terrestrial digital tv. By Dr. Iain Mosely.

Although digital tv continues to offer exciting new features and user benefits, there still remain an estimated 100 million households in Europe that use analogue services. To address this market potential, digital video broadcast – terrestrial (DVB-T) based systems have been developed to offer basic digital tv services. In contrast to the more conventional set top box, these units are designed to offer basic digital tv provision through a traditional aerial in a small, low cost unit.
Due to limited space, the power architecture of the first generation of these decoders has been based on an external AC/DC adapter providing low voltage DC to the unit. This voltage is then converted to the required system rails with internal DC/DC circuitry.
It has been estimated that this approach can cost up to 50% more than using a single internal offline converter. By using the advanced features of Power Integrations’ TOPSwitch-GX, an offline power supply measuring just 80 x 35 x 16mm has been realised, allowing for internal offline power conversion and system level cost reduction.
A generic specification has been used as given in Table 1. The prototype has a continuous output power capability of 7.8W in 50degC ambient. In addition to these general requirements, the prototype is designed to meet EN55022 EMI standards with a hard ground on the output, indicative of functional grounding through a SCART lead.

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Vanessa Knivett

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