Using the MOSFET Power Switch Module (CE09733)

Support Product Questions
1

Hello. I’m aiming to use this module to control a LED module with a RPi Pico. The LED module draws 700mA at 24VDC. I’m a bit confused by the product diagram though (below). For low-side switching I would have thought the load’s ground would go to the input of the MOSFET module, and the output of the MOSFET module would go to ground. But the diagram shows + and - for both load and supply. Could someone please point me to an example of connecting this module?

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2

Hi Daryl.
Welcome
What a way to start. That is one of the worst product descriptions I have seen.
I for one would like to see a schematic before I commented.
I think someone reversed engineered this thing and published a schematic somewhere on the Forum but I don’t remember the circumstances now.
Cheers Bob

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3

Thanks Bob. I worked out where I went wrong; I had incorrectly connected both the load -ve and supply -ve to ground, so the lamp was always on. All good now.

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4

Hi Daryl,

Did you work out this Mofset at all ??? I’m a very ametaur hack at electronics and learning by example but cannot work out how to connect this this at all. If the above schematics are wrong, I have no hope. Any assistance or working example you might be able to share would really be appreciated.

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5

Hi Craig
As I understand it this is how the switching works

image
image654×833 115 KB

As Daryl said he connected both load negative and supply negative to ground thus effectively shorting the switch and his load (lamp) was always ON.
Cheers Bob

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6

Hi Craig. The diagram at the top of the post is not wrong; I just found it easy to misunderstand :-). Bob’s figure shows how to interpret it. Once I hooked it up properly it works fine.

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