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
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.
The iW1679 lowers BOM costs up to 10%(4) compared to FET-based designs. Additional BOM cost savings come from Dialog's patented PrimAccurate(TM) primary-side control technology that eliminates the need for a secondary-side regulator and optical feedback isolator.
The iW1679 offers a user-configurable, four-level cable drop compensation option to eliminate the ordering and inventory challenges of stocking multiple product versions for various output voltage needs. It comes in a standard, low-cost, 8-lead SOIC package and offers full protection from fault conditions, including output short-circuit, output over-voltage, output over-current, and over-temperature protection.
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