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请教可调DC-DC电源设计电感选取

需求是从15V输入,输出可调2-12V,输出电流200mA,我想的是有两种方案:一种用DC芯片,效率高,第二种是LDO芯片,但是压差可能比较大,损耗大。所以优先想用DC芯片,但是遇到问题是电感值怎么选,电感跟频率、输出电压值都有关系,输出值不确定的话,我怎么确定电感值呢?