DER-227 reveals design of 3W power supply circuit
Power Integrations
Power supply circuit
Power Integrations, a specialist in high-voltage integrated circuits for energy-efficient power conversion, has released the latest Design Engineering Report (DER-227).
The report details the design of a 3W power supply circuit that consumes just 10MW 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 (EuPs).
The EuP standard will limit standby power consumption to 500MW and many eco-minded manufacturers of consumer products and appliances are choosing even lower standby power budgets of 100MW, 50MW or even 30MW, according to the company.
A standby power supply that consumes only 10MW 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 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-227 is based on Power Integrations' LNK363DN, a member of the Linkswitch-XT offline switcher IC family in an SO-8 package.
This 3W, single-output, isolated power supply operates from a universal 85VAC to 265VAC input, delivering 5V at up to 0.6A.
It 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 v2.0.
Related images
Request more information
More stories
PI Expert Suite includes thermal calculations for improving heatsink performance
Power Integration’s PI Expert Suite Version 8.5 is a piece of power supply design productivity software that is compatible with the company’s HiperLCS range of high-frequency LLC converter ICs and its TOPSwitch-JX series of integrated offline switcher ICs.
Power-supply ICs designed for slim LED-backlit TVs and PC main power systems
Power Integrations has introduced HiperLCS, a range of high-voltage LLC power-supply ICs that incorporate the controller, high- and low-side drivers and both MOSFETs into a single package, making them suitable for applications such as slim LED-backlit TVs, PC main power, servers, telecoms and networking equipment, LED streetlights and laser printers.
15W LED downlight driver uses active damping for flicker-free dimming
Power Integrations 15W PAR38 LED downlight driver for high-voltage integrated circuits, the Linkswitch-PH, allows flicker-free dimming and is 85 per cent efficient.
Power Integrations offers design example report for high-efficiency 900W power supplydownload
Power Integrations has published DER-274, a new design example report that describes a 900W power supply with 97 per cent efficient active power factor correction (PFC), designed for use in white goods, blowers, motor control drives and computing applications.
Power Integrations releases compact 25W LED lighting ballast reference design for T8 tubesdownload
Power Integrations has published the DER-287 reference design for a 25W LED T8 tube ballast power supply designed to reach 91 per cent efficiency and to be used in commercial and industrial lighting.
