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TPA3116D2: TPA3116D2

Colin li
Prodigy 40 points
Part Number: TPA3116D2

From 7.3.10 section,

如果功放输出短路，那短路就会保护并锁死，如果要能自动恢复，那将FAULTZ pin与SDZ pin连在一起，出现的问题是FAULTZ pin上拉1K电阻，输出短路不会恢复，上拉100K电阻才可能，

想知道为什么上拉1K电阻不行.

  • 0
    TI__Guru**** 185470 points

    您好，

    1K电阻时是不能拉至0.8V以下是吗？如果是这样的话，那应该是FAULTZ pin内部晶体管导通电阻太大的缘故。FAULTZ pin是OD输出，内部晶体管导通时输出低电平，如果其导通电阻太大，与外接的上拉电阻分压就会偏高，使得其输出低电平不满足SDZ pin输入规格：

  • +1
    Prodigy 40 points

    thank you very much for the quickly reply.  yeah, 1k pull up doesn't pull the voltage of the SDZ to less than 0.8v. i have changed the pull up to 100k, then it worked well.