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求一个隔离的DC-DC方案，输入为5~30V，输出为9V。负载电流不超过50mA。是弱电应用，也不需要很强的隔离电压能力。
并不是量产的产品，成本可以不考虑，因此变压器最好是市场通用物料，digikey上也可以，便于购买。
由于对于flyback不太了解，只是为了满足实验室小项目应用。还请大家推荐一下方案，谢谢！
