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Author Topic: For experts: What are the functionalities of these components?  (Read 1632 times)

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Offline jacop.abrahamTopic starter

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For experts: What are the functionalities of these components?
« on: March 15, 2017, 10:36:44 am »
Hello
on this link there is a PoE demo board from Linear Technology. I wanted to know what do the Components D12, R20, C16, R19, D11, D13 und C17  actually do here.



Thx in advance
Jakub
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Offline rstofer

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Re: For experts: What are the functionalities of these components?
« Reply #1 on: March 15, 2017, 02:31:51 pm »
Hold the MOSFET off during startup?
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Offline jacop.abrahamTopic starter

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Re: For experts: What are the functionalities of these components?
« Reply #2 on: March 15, 2017, 02:39:45 pm »
Assume is true. In this case the components D12, R20, C16 are sufficient for this function and no need for the other components! am i right?
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Offline rstofer

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Re: For experts: What are the functionalities of these components?
« Reply #3 on: March 15, 2017, 05:34:58 pm »
How about the other parts pull the gate down when the power rail goes down to prevent the gate from going a lot higher than the drain.  They also discharge C17 and C16.

If might be useful to look at the definition of the NGATE pin.

I would be willing to bet that all the parts are there for a reason.
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Offline jacop.abrahamTopic starter

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Re: For experts: What are the functionalities of these components?
« Reply #4 on: March 16, 2017, 11:22:49 am »
I would be willing to bet that all the parts are there for NO reason. :)
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