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LM3488: LM3488 无法起振,输出一直是Vin的高电平

Part Number: LM3488
Other Parts Discussed in Thread: TIDA-010057,

我安装TI的文档TIDA-010057画的参考电路图:

板子加工回来后,LM3488芯片的DR引脚一直是高电平。短路保护没有触发,接入250KHz,电压3.3V的外部时钟,DR引脚依然不行。

在刚起动时DR引脚有下拉,后面就一直是高电平