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MC34063转换负电压，电感总是在发出嗤嗤的声音，希望大家给个介意，电路图就是官方资料的图纸！
请检查PCB layout和参考板是否比较接近，同时看看所选的电感电容元器件是和合理，同时看看开关波形，先把他调稳定。
MC34063没有类似burst模式，正常不会有音频噪声。可能是环路不稳定导致电流有较大波动。
