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跟着便携电脑的尺度越来越小,分量越来越轻,从前作为电脑的“小尾巴”的电源适配器现在好像要叫“大尾巴”了!电源适配器怎么完成小型化,来配得上越做越小的便携电脑则成为一项有必要考虑的问题。 从功率器材开展来看,从NPN型功率器材开展到MOS管功率器材只用了大约10年的时刻,功率器材的尺度缩小了5倍;而在运用硅MOS管的30年期间,器材的尺度并没有提高许多,功率虽然有10%的提高,可是器材尺度缩小还不到10%;直到包括GaN在内的新资料呈现后,不到3年的时刻,功率器材的功率及尺度的提高又持续加速。在未来的十年,估计将在2025年再次提高3~5倍,别的,功率也会到达95%~99%。由此看来,新资料的开展会是功率器材开展的重要促进要素之一。
图1 功率器材的开展 作为世界上第一家也是仅有的氮化镓(GaN)功率IC公司,纳微(Navitas)也正是看到了这一开展规律,最早选用新式GaN功率芯片——AllGaNTM。新式功率芯片为功率器材带来了速度和功率两方面的提高。 因为硅资料的结构特性所限,一向无法一同满足速度和功率作为功率器材的两大规划参阅目标。AllGaNTM经过装备新式拓扑——有源钳位反激 (ACF) 拓扑结构和新资料,并将驱动和GaN集成到一同,然后完成开关速度和功率两者的一起提高。新功率器材能够供给高达400MHz的开关速度,其速度比典型的转换器规划快了3至4倍,损耗下降40%,密度提高达5倍,体系本钱也会下降20%,然后完成更小的尺度和更低的本钱。该规划彻底符合欧盟CoC Tier 2及美国能源部6级 (DoE VI) 所规范的能效规范,更在满负载下完成超越94%的最高尖峰功率。
图2 AllGaNTM功率IC器材结构 单芯片GaN功率IC与半桥GaN功率IC 纳微在推出AllGaNTM平台后,针对新式资料GaN先后推出了两类功率IC,即单芯片GaN功率IC和半桥芯片GaN功率IC。 纳微单芯片GaN功率IC是一款在650V下的单片式集成产品。该款产品选用5mm x 6mm QFN规范封装。考虑到本钱问题,纳微单芯片GaN功率IC整个系列只用了这样一个封装方式。驱动选用内置驱动,高压信号输入时,即可实轻松现功率转换。纳微一起创始人兼首席执行官Gene Sheridan介绍称,经过这样的驱动器整合,以软开关为例将单芯片GaN功率IC与硅器材比照的话,硅器材电压上升速度很快,会有暗影。而选用单芯片GaN功率IC器材,开关速度到1M时,开关电压为500V,由此可见,选用单芯片GaN功率IC器材彻底没有开关损耗, EMI性能也很好。
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