POWER -'New'power supply reference design enables'10 mW no-load consumption' - Embedded.com

POWER -‘New’power supply reference design enables’10 mW no-load consumption’


San Jose, Calif. -'Power Integrations has released'a new Design Engineering Report, DER-227, detailing'the design of a 3-watt'power supply circuit'that consumes just 10'mW during'no-load'operation.'This'minuscule'power'consumption'within the'power supply'leaves'much'more power available for use by electronic systems'designed to comply with'the'standby'power limits'mandated by regulations'such as the European Union's'Ecodesign Directive'for Energy-Using Products'(EuP).

The EuP'standard'limits'standby'power consumption to'500'mW,'and'many eco-minded'manufacturers'of'consumer'products and appliances'are'choosing'even lower'standby'power budgets'of'100'mW, 50'mW,'and'even 30'mW.

A'standby power supply'that consumes'only 10'mW'at zero load'allows'a greater'margin for leaky circuit components'such as input filters,'capacitors,'and bias components, while'still'providing'the'power'required'to support'valuable'system'standby activities. These include'functions'such'as'powering circuits to monitor an infrared remote'control'in consumer entertainment equipment, as well as'hardware to sense a key-press to activate appliances or'send'automated wake-up signals such as those provided to'an'LCD monitor by a PC.

The'power circuit described in'DER-277'is based'on'Power Integrations' LNK363DN,'a member of the'LinkSwitch-XT'offline switcher IC family'in an SO-8 package. This'3-watt,'single-output, isolated'power supply'operates from'a'universal 85'to'265 VAC input, delivering 5'V at up to'0.6'A.

The LNK363DN'meets'EN55022B/CISPR22B limits without'the'need for a Y'capacitor,'and meets'the efficiency requirements of the'European EuP Ecodesign Directive'and'ENERGY STAR'EPS v'2.0.

The'power supply'described in'DER-277'features'careful transformer design and circuit bias component selection,'combined with'algorithms that'switch'only'when'required to maintain output voltage regulation,'facilitating extremely low power consumption. This allows the supply to deliver power to the system immediately'when it turns on,'while'consuming'very little'power itself.

DER-227'is available now for download at'www.powerint.com/PDFFiles/der227.pdf.

For more information visit'http://www.powerint.com.

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