ON Semiconductor (Nasdaq: ONNN) recently introduced a GreenPoint(tm) reference design for 200 watt (W) power adapters used to power game consoles. The solution provides a blueprint for design engineers to implement adapters that minimize both active- and standby-mode power consumption. Delivering active-mode energy efficiency of 90% at full load, the new GreenPoint(tm) reference design achieves standby-mode power consumption of <1 W — exceeding CEC, ENERGY STAR®, and European COC requirements. A typical 200 W adapter used to power today’s game consoles consumes > 3 W in standby mode.
The GreenPoint(tm) 200 W design topology delivers higher power density, which allows this reference design to be housed in a smaller form factor than typical power adapters with the same power rating. The design can also be modified to include power factor correction.
The enabling device for the reference design is the NCP1562, an active clamp pulse width modulation (PWM) voltage mode controller designed for power supplies requiring high efficiency and power density. Featuring a highly accurate (±5% maximum) duty cycle limit, the NCP1562 allows designers to optimize the selection of the MOSFET to enable the best combination of performance and cost. The accuracy of this device is superior to currently offered competitive devices. The new controller features a soft-stop which prevents the typical oscillations in the forward active-clamp topology and in turn provides a safer and more robust design. Enhancing the safety and reliability of designs, the device features a dual mode over-current protection circuit that handles momentary and continuous over-current conditions differently. These integrated features provide the best tradeoffs in system performance and safety, and decrease the development time needed for power supply applications.
A complete documentation package for the 200 W power adapter – including description, block diagram, schematic, bill-of-materials, Gerber images, and evaluation results – is available, as are the product specifications and other supporting information. The NCP1562 is offered in RoHS-compliant, Pb-free SOIC-16 and TSSOP-16 packages. It is priced at $1.60 per unit in 2,500 unit quantities.
GreenPoint(tm) reference designs enable more efficient systems by establishing the feasibility of meeting emerging energy efficiency standards with existing technology, and by setting performance benchmarks. ON Semiconductor’s GreenPoint(tm) reference designs are available for ATX, CRT TV, and LCD TV power supplies; and 5 W, 16 W, 40 W, 60 W, 90 W, and 200 W power adapters.
More info: GreenPoint Reference Designs