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LM3881 adj 脚电容大小

Other Parts Discussed in Thread: LM3881

LM3881 adj 脚电容大小有限制么?SPEC上推荐是 10nf。 如果是 pf 级的电容,可以么?把时间限制在1ms以内

  • it can be shown that the timing capacitor-clock period relationship is typically 120 µs/nF. For example, a 10 nF capacitor sets up a clock period of 1.2 ms。

    1nF的话,就是一个周期为0.12ms,假如9*0.12ms, 或者8*0.12ms可以满足你的时序要求,那也没有问题的。

     

  • Trevor 说:

    it can be shown that the timing capacitor-clock period relationship is typically 120 µs/nF. For example, a 10 nF capacitor sets up a clock period of 1.2 ms。

    1nF的话,就是一个周期为0.12ms,假如9*0.12ms, 或者8*0.12ms可以满足你的时序要求,那也没有问题的。

     

    Trevor回答得很好,补充一点就是电容的误差一般是20%,所以选在7nF比较合适。