The BM2Pxxx Series High Efficiency AC-DC Converter IC with Internal MOSFETFreedom of Design and Conformance to the New Energy Star v. 6.0 Standard

－You have explained that the low conduction losses and switching losses of SJ MOSFETs contribute to efficiency. But about what level of efficiency can actually be expected?

We previously mentioned that when developing the BM2Pxxx series, much attention was paid to the Energy Star standard, which is an international criterion for reducing energy consumption. The BM2Pxxx series was designed for thoroughgoing reduction of power loss not only in the IC itself, but over the entire circuit, in order to boost efficiency not just in heavy loading, but during light loading and in standby mode as well. Energy Star is a standard that demands such high efficiency over a range of loading states.

Were you aware that the Energy Star standard has recently been updated from version 5.0 to version 6.0? The BM2Pxxx series can meet the stricter Energy Star 6.0 requirements as well. This update includes stricter targets for reduced power consumption in standby mode, and high values for efficiency are required as well.

Please have a look at the materials I have prepared. The lower graph illustrates the differences in required efficiency for the previous Energy Star 5.0 and the new version 6.0. The blue line is 5.0, and the red line is version 6.0. Comparison shows that the required efficiency is considerably higher at 25 W and below in particular.

Of the following two diagrams, the above graph compares efficiencies for 25 W wall adapters using the BM2Pxxx series of BM2P014 and an equivalent device, and shows the Energy Star 6.0 requirements with a red line. At 25 W, an efficiency of 86.35% is required; the BM2Pxxx series is able to satisfy this requirement.

Moreover, the diagram below indicates the standby power consumption for the BM2P014 together with the standby power requirements for Energy Star 6.0 and requirements of the European Union. Energy Star 6.0 requires that the power be not greater than 100 mW for 100 VAC input and not greater than 210 mW for 230 VAC input. The BM2P014 achieves power levels of 20 mW or below at 100 VAC and 30 mW or below at 230 VAC, easily meeting these requirements. The European Union standard is strict in requiring that power consumption be 50 mW or below for all input levels, but the BM2P014 clears this hurdle as well.

－I see. When compared with such actual specific standards, it is　clear that efficiency has been improved considerably. It makes one appreciate that these devices were developed targeting applications such as wall adapters up to 25 W, home appliances, office equipment, and the like.

Thank you. We would really like these products to be used in applications where conformance to Energy Star 6.0 is required. I would also like to note that there is quite a lot of variety among applications rated at 25 W or below. In fact, we have prepared a lineup of 24 models in all to accommodate such diverse applications.

－That’s right, at the beginning you mentioned that there are 24 models. Could you please explain their configuration in some detail.

The 24 models in the BM2Pxxx series combine the four parameters and features indicated below. Specifications are subdivided so that there are models that are a good fit with various kinds of equipment and devices.

By incorporating power transistors and providing nearly all the protective functions that might be needed, these products greatly simplify the design of AC-DC converters, and by providing a full range of model configurations, our customers should be able to use these products in a wide range of applications. Please refer to the following product lineup table.