LMX358IQ2T输出电压信号将保持绝对最大值或最大值吗？

你好
 
关于所需的源电流，我可能无法清楚地理解配置。最坏的情况是Vout = 5V且R = 100
？
 所以最大电流是50mA不是吗？
无论如何，让我们考虑一个电流源max @ 100mA。
 
关于数据表中关于Isource的问题：
数据表中写入的源电流表示当LMX358在饱和模式下使用时（实际上在比较器中）输入电压vid = 1V时器件可以提供的最大电流。因此，在这种配置中，没有任何电流输出，输出为5V（考虑到Opamp是由5V供电）。当输出电压达到Vout = 0V时，给出Isource值参数。因此，该参数表示最大的采购能力而不是重载电流。
为了更好地了解Vout降级与Isource电流，您必须查看数据表的图5和图6。它表示当电流下沉/来源时输出的典型行为（在不同温度下）。
 
要获得50到100mA的电流，最好使用TS982 Opamp（
https://produktinfo.conrad.com/datenblaetter/1100000-1199999/001184372-da-01-en-IC_OP_AMP_DUAL_BIP_TS982IYDWT_SOIC_8_STM.pdf
）。
图2显示了TS982输出与源电流的关系。您可以看到（@ 25°C）50 mA源电流，通常可以预期从大约400mV的高电压轨下降，并且通过100 mA源电流，您通常可以预期从大约650mV的高电压轨下降。
 
我希望我已正确理解你的观点，这个建议可以满足你的期望。如果不是毫不犹豫地问。
最好的祝福
萨科



以下为原文





Hello



Regarding the source current needed I might not clearly understood the configuration. The worst case would be Vout=5V and R=100
?
so the max current will be 50mA isn?t it?

Anyway let?s consider a current source max @100mA.



Regarding your question about the Isource in the datasheet:

The source current written in the datasheet represents a max current that the device can deliver when LMX358 is used in a saturated mode (actually in comparator) with a input voltage vid=1V. So in this configuration and without sourcing any current the output is 5V (by considering that the Opamp is power supplied by 5V). The Isource value parameter is given when the Output voltage reach Vout=0V. So this parameter express the maximum sourcing capability and not a regload current.

To get a better idea of the Vout degradation vs Isource current you must have a look to the figure 5 and 6 of the datasheet. It represents a typical behavior of the output (at different temperature) when an current is sinked/sourced.



To source a current from 50 to 100mA it would be better to use a TS982 Opamp (
https://produktinfo.conrad.com/datenblaetter/1100000-1199999/001184372-da-01-en-IC_OP_AMP_DUAL_BIP_TS982IYDWT_SOIC_8_STM.pdf
).
The figure 2 show the behavior of the TS982 of the output vs sourcing current. And you can see (@25°C) with a 50 mA source current you can typically expect a drop from the high rail of roughly 400mV, and with a 100 mA source current you can typically expect a drop from the high rail of roughly 650mV.



I hope I have correctly understood your point and this suggestion can match with your expectation. If not don?t hesitate to ask.

Best regards

Nicolas

非常感谢尼古拉斯。这是一个很大的帮助。是否有TS982的单一封装版本？
非常感谢，
戴夫



以下为原文




Many thanks Nicolas. That was a great help. Is there a single package version of the TS982?
Many Thanks,
Dave

嗨大卫
我真的很抱歉我这么晚的回答，这个帖子逃到我的盒子里......
无论如何不幸的是TS982只有双包装才有。
BR
萨科



以下为原文




Hi David
I'm really sorry for my so late answer, this post escape to my box ...
Anyway unfortunately not TS982 is available only in dual package.
BR
nicolas