Power Integrations has released a new design engineering report (DER-227) which details the design of a 3 W power supply circuit that consumes just 10 mW during no-load operation. This low 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 will limit 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 or even 30 mW. A standby power supply that consumes only 10 mW at zero load allows a greater margin for other leaky circuit components, such as input filters, capacitors and bias components, while still providing the power required to support system standby activities.
The power circuit described in DER-227 is based on Power Integrations' LNK363DN, a member of the LinkSwitch-XT offline switcher IC family in an SO-8 package. This 3 W, single-output, isolated power supply operates from a universal 85 to 265 V a.c. input, delivering 5 V at up to 0,6 A. It meets EN55022B/CISPR22B limits without the need for a Y capacitor, and meets the efficiency requirements of the EuP directive and Energy Star EPS v 2.0.
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