DGAP-News: Dialog Semiconductor Plc. / Key word(s): Product Launch Dialog Semiconductor Plc.: DIALOG SEMICONDUCTOR PWM CONTROLLER IC LOWERS COST AND STANDBY POWER IN SMARTPHONE POWER SUPPLIES 17.09.2013/ 08:00 --------------------------------------------------------------------- DIALOG SEMICONDUCTOR PWM CONTROLLER IC LOWERS COST AND STANDBY POWER IN SMARTPHONE POWER SUPPLIES iW1679 digital AC/DC PWM controller is first to replace FETs with lower-cost BJTs in 10 Watt adapters and chargers Kirchheim/Teck, Germany, 17 September 2013- Dialog Semiconductor plc(FWB: DLG), a provider of highly integrated power management, audio, AC/DC and short-range wireless technologies, today launched the industry's first digital pulse width modulation (PWM) controller that can easily and efficiently drive low-cost, 10W power bipolar junction transistor (BJT) switches to reduce the BOM cost in 5V/2A smartphone adapters and chargers. The new iW1679 allows designers to replace field effect transistors (FETs) with lower-cost BJTs and address the market trends for lower standby power and higher light-load and active average efficiency in smartphones, media tablets and consumer electronic products. Developed by Dialog's Power Conversion Business Group(formerly iWatt Inc.), the iW1679 delivers on Dialog's goal to expand its addressable market. The iW1679 reduces BOM costs while achieving high efficiency through the use of Dialog's adaptive multi-mode PWM/PFM control that dynamically changes the BJT switching frequency. This optimises the system to improve light-load efficiency, power consumption and EMI. The iW1679 provides high, 83% active average efficiency, maintains high efficiency at loads as light as 10%, and achieves < 30mW no-load standby power with fast standby recovery time. This enables designers to meet or exceed emerging global energy standards, including the proposed stringent European CoC version 5(1), which is anticipated to require 76% active average efficiency and high light load efficiency down to 10% loads, as well as the proposed U.S. DoE(2) regulation, expected to require 79% active average efficiency, and the Energy Star EPS 2.0(3), which will require 73% active average efficiency. 'The use of BJTs is prevalent in 5W and lower power supplies, where Dialog is a leader with a wide range of digital PWM controllers designed to drive BJTs,' commented Ron Edgerton, Vice President and General Managerof Dialog's Power Conversion Business Group. 'With the iW1679, we are applying this extensive knowledge to bring the same low cost, high efficiency and performance benefits to higher power applications.' While BJTs reduce cost compared to FETs, BJT drive requirements are more complex. The iW1679 solves this challenge by using Dialog's patented digital control technology to actively modulate the BJT base current drive. This optimises performance and improves efficiency by keeping the BJT out of saturation. Since BJTs have softer switching compared to FETs, they generate less noise and, therefore, have inherently lower EMI. The iW1679 features Dialog's EZ-EMI(R), an internal EMI technique that uses valley mode switching to further reduce EMI, simplify manufacturing and minimising the need for external EMI filtering components. It also includes a proprietary switching mode that results in no audible noise from the controller.