选用的TL751M05QKVURQ1这颗芯片在输出MLCC未10uf时候,纹波还在400mv,将输出的MLCC换成33uf之后纹波还有200mv,与数据手册的宣称的150mv有明显的差异,我怀疑这个芯片是不是本身有什么问题,要不不可能纹波这么大。
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选用的TL751M05QKVURQ1这颗芯片在输出MLCC未10uf时候,纹波还在400mv,将输出的MLCC换成33uf之后纹波还有200mv,与数据手册的宣称的150mv有明显的差异,我怀疑这个芯片是不是本身有什么问题,要不不可能纹波这么大。
HI
TL751M05为了反馈控制回路稳定对输出电容ESR有要求。
The output capacitor value and the parasitic equivalent series resistance (ESR) affect the bandwidth and stability of the control loop for these devices
陶瓷电容ESR太低,不合适直接应用。根据datasheet 第七页figure2选择合适电容。