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TPS54XXX系列芯片的最大输入电压范围

Other Parts Discussed in Thread: TPS54040, LM5007, TPS54060

用过几个NSC的片子,如LM5007,输入电压范围可达72V,而TPS54040只有40V,差距好大(这两个片子其它方面差不多,而且TPS54040的纹波噪声特性更好一点)。是不是TI一直没有攻克这个技术难题?