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急:调试TPS61028中遇到的问题

Other Parts Discussed in Thread: TPS61028

与社区中一帖提到的问题相同。调试TPS61028中遇到问题,空载时候,输出正常为3.9V,150mA左右能正常输出(前提是输入上电后,再接入负载;若输入上电前,接入负载,则输出为2.4V),但是300mA时候输出都是1V。资料及电路图如下,电感使用的是6.8uH 2.75A饱和电流的绕线贴片功率电感。请有用过这个芯片的、有相关经验的给些指导与意见,谢谢了。