Power Electronics

Controllers Break New Ground in Ultra-Low Standby Power in 12W to 24W Power Supplies

iWatt Inc. has raised the bar for no-load standby power consumption and efficiency in 12W to 24W power adapter and charger applications with the iW1761 and iW1762 digital pulse width modulation (PWM) controllers. These new devices expand iWatt's latest PrimAccurate(tm) controller platform, lowering power draw in standby mode to just 10mW at up to 12W output power (iW1761) and 20mW at up to 24W output power (iW1762). The iW1761 and iW1762 controllers offer even lower standby power consumption than iWatt's recently announced iW1699 and iW1760 with their respective 30mW (at 12W) and 50mW (at 40W) standby power consumption.

All four devices exceed current energy standards in the markets in which the company competes, including the proposed stringent 2012 U.S. DoE(1)regulation requiring under 100mW AC/DC adapter standby power consumption and tighter efficiency requirements. Like the previous iWatt parts, both the iW1761 and iW1762 enable high power density in an ultra-small overall adapter size. The iW1761 and iW1762 meet the compact size and low power requirements of next-generation compact media tablet power chargers and adapters. They also offer significantly greener and smaller solutions for AC/DC power adapters in a wide range of electronic products that remain permanently plugged in to the wall in standby mode, including set top boxes, satellite receivers and home networking equipment.

Besides very low standby power consumption, these new controllers provide good dynamic load response (DLR). Power supplies that achieve low standby power typically do so by entering a standby operating mode. However, when a load is applied, they need to "wake up" quickly to keep the output voltage from dropping too low. Dynamic load response is determined by the speed at which the system wakes up and responds to changes in the power load. The iW1761 and iW1762 offer the ultimate in low standby power with good DLR, while the recently announced iW1699 and iW1760 give designers options for higher DLR performance.

iWatt's ultra-low standby power AC/DC controller platform employs the company's patented PrimAccurate primary-side control. This unique technology uses proprietary digital algorithms to eliminate the need for a secondary side regulator and optical feedback isolator, lowering the total BOM cost, reducing the overall solution size, and improving reliability. PrimAccurate technology enables accurate control of the output over a wide range of operating conditions and ensures tight load and line regulation, along with full protection from fault conditions, without costly additional components.

The iW1761 and iW1762 are available now in production quantities. They come in a standard, low-cost, 8-lead SOIC package. Pricing is $0.34 for both parts in 1000-piece quantities.

iWatt Inc.
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