Nov 07, 2021
03:16 AM
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Nov 07, 2021
03:16 AM
1 Solution
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Nov 07, 2021
06:24 PM
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Nov 07, 2021
06:24 PM
您好,
RFE引脚相当于一个使能信号。当RFE处于高电平时,驱动器可以正常工作。当RFE处于低电平,驱动器没有输出。有两种情况可以触发RFE的低电平。一种是VCC信号的电压不足,也就是UVLO(见Datasheet中6.4)。第二种是ITRIP报告错误的时候,也就是出现过流的时候。一旦有错误发生,RFE马上内部会被拉低到Vss,然后故障清除定时器开始工作,直到故障清除并且故障清除计时截至,RFE信号才会被拉高。故障清除定时器时间常数可以通过RRFE与CRFE来设置,设置方法见Datasheet第16页。
希望我的答案可以帮助到您。
Steven
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Nov 07, 2021
06:24 PM
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