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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1053018/faq-lm388x-what-is-the-flag-output-of-the-lm388x-if-there-is-no-voltage-applied-to-vcc-vin
输出将是高阻抗。 LM3880数据表的图10和 LM3881数据表的图6显示了 VCC 之后的标志。
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