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TI invert 方案

Other Parts Discussed in Thread: LM22670, LM22670INVEVAL, TPS5420, TPS5430, LM53602, LM26003

我想实现+19V以上输入,-5V以下输出,电流1A以上,搜了一下没有集成的DCDC IC能实现,请问有没有什么方案?