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LM2596 负电压电源的疑惑

Other Parts Discussed in Thread: LM2596

有没有使用过LM2596芯片负电压电源功能的朋友?我想用它来做一个运放双电源的负电压电源。如图中,-5V Vout端的电流它是source还是sink?或者两者皆能?它能不能和+5V电源配合来吸入电流?