Electronics > Beginners

Having problems with a step up converter

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Moriambar:
Hi there.

I bought some adjustable boost converters and, while trying them out, I found out that the out voltage is always ≤ than the input voltage. Since the purchase was done on the internet (chinese market), I then tried and bought the item somewhere else, but also from china.

Well, guess what… I had a different product but the same result. I inspected both products and it had it all: schottky diodes, IC, capacitors, inductor…

So what I am saying is: have I been bamboozled twice or, in order to make a step up converter work, do I need to provide it some kind of load?

Thanks

hsn93:
there is no enough information, picture, drawings, or product name at least?

Moriambar:

--- Quote from: hsn93 on October 08, 2018, 07:19:34 am ---there is no enough information, picture, drawings, or product name at least?

--- End quote ---
Hi.

Yes, sorry; this is the ebay one (which I've thrown away thinking it was faulty)
while this is the other one.

Thanks

mariush:
We can't see the second one since you're linking to the order page, and only you can see that.  Plus, we may need an AliExpress account to see that anyway, and not everyone feels like creating an account just to help you.

As for the first link, it should be genuine step up dc converter. It uses a MT3608 IC (as it says on the pcb) which is a step-up regulator IC. You can see the datashet here: https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf

Maybe you wired it wrong.  Input voltage (up to 24v) was supposed to go on VN+, ground on VN- ,  you adjust the output voltage using the trim potentiometer, it's not rocket science.

Moriambar:

--- Quote from: mariush on October 08, 2018, 07:38:41 am ---We can't see the second one since you're linking to the order page, and only you can see that.  Plus, we may need an AliExpress account to see that anyway, and not everyone feels like creating an account just to help you.

As for the first link, it should be genuine step up dc converter. It uses a MT3608 IC (as it says on the pcb) which is a step-up regulator IC. You can see the datashet here: https://www.olimex.com/Products/Breadboarding/BB-PWR-3608/resources/MT3608.pdf

Maybe you wired it wrong.  Input voltage (up to 24v) was supposed to go on VN+, ground on VN- ,  you adjust the output voltage using the trim potentiometer, it's not rocket science.

--- End quote ---

That's what I did, but got what I said, namely an out voltage lower than the input.

Here is the genuine link to the aliexpress product. If you can help me there too, I'd be grateful, otherwise no problem, I'll try search around for other components. Perhaps I've been unlucky with a defective component (ebay) and bought something shady (aliexpress). I'll try again then

Cheers!

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