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Topic: RGB Matrix: Looking for fet (Read 725 times) previous topic - next topic

CvMeer

Hello,

I am making a board for controlling an RGB matrix.

It`s a Common Anode matrix.


Now i have two questions:

-I want to use 3 595`s to sink current, is that possible?

-I am looking for an SMD fet i can source current with.

The choice is so big i don`t know what to use.


Thanks in advance,

Collin

Grumpy_Mike

Quote
I want to use 3 595`s to sink current, is that possible?

Should be.

You want a P-channel logic FET.

Quote
The choice is so big i don`t know what to use.

Sort them by price and pick the lowest price one.


Grumpy_Mike

Quote
But in the datasheet it says things like: Vds -20V

So if that is how much the drain / source will take before it breaks down you are fine. The negative sign means voltage relative to the source, which in a P-channel FET is sitting up at the +5V level, so 0V will be like -5V to the FET, therefore you are well within the range of allowable voltages. The gate threshold should have a -ve value as well.

CvMeer

Thanks allot.

I will read up on transistors and fets  :)

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