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请推荐一个0到-8V输出可调的电源设计方案

输入是+12V,要求输出是0到-8V可调,输出电流正常工作200mA,最大400mA,在TI网站上搜了一遍没有满足要求的芯片,请高手推荐一款电源方案,要求可调节方式简单最好用单电阻调节(但不强制要求)。多谢!