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pga300数据表问题

Other Parts Discussed in Thread: PGA300

pga300数据表里关于电压输出的例图42、43是不是有问题?怎么可以将OUT接到地上?OUT 和 FB-间的电阻按什么规则选阻值?

  • 您好是的,这里接法是有问题的,输出端应该是接一个电容到地,目的是驱动一个比较大的电容负载,因此OUT 和 FB-间的电阻是一个隔离电阻,这个阻值一般比较小,22ohm左右吧。 因此这也解释了下面8.1.2.1 Design Requirements的最后一条内容:
    Implement compensation, using the COMP pin and an isolation resistor, when driving large capacitive loads
    with the OUT pin.