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板子+12伏供电。怎么得到LDO-12伏电压?

Other Parts Discussed in Thread: LM2672, LM337

板子+12伏供电。怎么得到LDO-12伏电压?若考虑先通过开关电路得到如-15V的电压,在通过LDO变为-12.这样的话要用到哪些芯片呢?暂不考虑其他要求