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LM3478 FA/SD一直都是1V的电平,驱动无波形

Other Parts Discussed in Thread: LM3478, LMR16006

手册上只说shutdown为FA脚高电平30us,无驱动输出,想知道怎么解决这样的问题?

前面搞了好久才把第一块板子的输出和负载能力都搞好;这是后面焊接的几块板子,调试过程中现线过也有驱动Vg才2-3V的波形的(输出 电压变为16VDC,负载12R),然后就变无输出,更换过LM3478后就出线上述说的保护了。