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设计一个电源,不知道选择的芯片合适不??

Other Parts Discussed in Thread: MSP430G2553, TPS40170, UCC28060, UCC28600, UCC28051, LM22676, UCC28610, TPS5430

我想设计一个电源,输入AC176——255V,输出DC5——15V,电流为 2A。我选择MSP430G2553为核心控制芯片,在AD—DC选择了UCC28060将AC220V转换为DC40V左右,再在DC—DC中选择了TPS40170将DC40V输出为5——15V,不知道这几个芯片合适吗?可以做到纹波很小吗?效率可以做到90%以上吗?再就是我看了UCC28060的资料中的应用电路可以用吗?也没有详细的说明,TPS40170是我用的“SwitcherPro Desktop”软件设计的!!!

希望TI的工程师们给下支持吧!!!!!