Power supply designs for 45W and 12W Ultrabook adapter
Dialog Semiconductor plc has announced its new power supply reference designs for thin 45W and 12W travel-size power adapters that can be used with an Ultrabook. Dialog claims its 45W design enables Ultrabook power adapters that are less than one-half the overall volume and approximately 50% thinner than conventional 45W adapters. The 12W design enables the first compact, pocket-size adapters for an Ultrabook at just 68mm x 68mm x 17mm thick, with a typical charge time under five hours, says Dialog.
Dialog’s 45W and 12W designs support Intel Turbo Boost Technology with 82W peak power capability at 10% duty cycle for the 45W adapter and 2% for the 12W adapter. They also meet proposed European CoC version 5(1) and U.S. DoE(2) regulations. 45W design offer 90% active average efficiency and no-load stand by power consumption of <100mW. The 12W design provides 86% active average efficiency and no-load stand by power of <50mW . Both designs also said to maintain high efficiency at loads as light as 10% and fast switching from stand by mode to active mode.
The 45W is designed using Dialog’s iW1762 digital pulse width modulation (PWM) controller in a PCB which fits in a 61 cubic centimetre (cc) adapter case and is up to one-half the size of conventional 45W power adapters, which can be as large as 168cc, or more. The 12W design uses Dialog’s iW1760 PWM controller in a PC board that fits in a pocket-size 80cc adapter case.
Volex plc provides the enclosure design for both the 45W ultra-slim and 12W travel adapters.
“Dialog’s Power Conversion Business Group is best known for reducing size and power consumption in power adapters for smartphones and tablets,” according to Mark Tyndall, Senior VP Corporate Development and Strategy, General Manager of the Power Conversion Business Group at Dialog. “Applying this expertise to higher-power class adapters, Dialog is the first supplier to deliver incredibly slim, ultra-light charger designs that users should expect with next-generation Ultrabooks.”
The iW1762 and iW1760 digital PWM controllers employ primary-side control and eliminates the need for a secondary-side regulator and opto-isolator, reducing the bill of materials (BOM) costs, improving line-voltage surge protection, and delivering overall rugged performance, according to Dialog.