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TPS61040 低温启动问题



Hi,

原理图附件,5V输入,+-9V输出,工作时5V输入电流70mA。有些板在低温-10度测试时,+9V输出只有5.14V。故障时SW引脚波形如下,

正常时SW脚波形如下,

设计有什么问题吗?