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Cheap little Buck #EDIT - NOT CONSTANT CURRENT

jnrpop

jnrpop

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Review - Cheap little Buck driver (EDIT - Its CV, NOT CC!!)

Stumbled across these, a cheap, small little buck driver.
I've ordered a few to see what they are capable off,
Anyone else used or have testing results on them??

Some info:
17mm x 11mm x 3.8mm
Model Name: Mini-360 (ultra small size DC-DC synchronous rectifier buck module)
Module Properties: Non-isolated buck
Rectification: Synchronous rectification
Input voltage: 4.75V-23V
Output voltage: 1.0V-17V
Output Current: Lowering the value of 3A, long 1.8A
Conversion efficiency: 96% (maximum)
Switching Frequency: 340KHz
Output ripple: 30mV (no-load)
Load regulation: ± 0.5%
Voltage regulation: ± 2.5%
Working temperature: -40~85'C
Features: Use integrally molded power inductor and synchronous rectifier control chip, smaller and more efficient.

Site: https://www.fasttech.com/p/6339500
 

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diachi

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Re: Cheap little Buck

Do you know if it's current regulated or voltage regulated? My bet would be on voltage...
 
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jnrpop

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Re: Cheap little Buck

Not sure, but i'd say current.
"Output Current: Lowering the value of 3A, long 1.8A " i'm assuming the lowering is with the Pot, and long 1.8A means for long operation, 1.8A is recommended :)
 
ElectricPlasma

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Re: Cheap little Buck

My bet's on voltage too, "step down" kind of indicates that it's meant for stepping down the voltage IMO

I think the pot is for adjusting the voltage output, I've used a similar module before and this was the case.

Edit: "Voltage regulation: ± 2.5%"
 
Last edited:
diachi

diachi

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Re: Cheap little Buck

ElectricPlasma said:
My bet's on voltage too, "step down" kind of indicates that it's meant for stepping down the voltage IMO

I think the pot is for adjusting the voltage output, I've used a similar module before and this was the case.

Edit: "Voltage regulation: ± 2.5%"
Click to expand...


Yep, that's my thinking too. Would be good in a situation where the relatively low efficiency of something like an LM78xx won't work. That said, you can get little switching regulators that are drop in replacements for the TO-220 LM78xx chips which would probably be better suited.
 
paul1598419

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Re: Cheap little Buck

I bought a few of these some years ago and they are voltage regulators. I was hoping at the time to convert one, but never got around to it.
 
jnrpop

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Re: Cheap little Buck

Appreciate the info :beer:
I should research what regulator does what, but I have a few coming so might find a way to convert them, is the difference with regulation just the orientation of the output pins on the regulator chip?
Is there an easy way to tell a driver apart by looking at the layout?

Edit: just found this Quote from sticky:

"regulators can be made to be constant current; it's just how feedback is changed"
 
Last edited:
paul1598419

paul1598419

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Re: Cheap little Buck

The quote you referred to was said mainly for linear regulators like the LM317. It can be a bit more complicated with buck regulators.
 
trinh hong phuoc

trinh hong phuoc

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Re: Cheap little Buck

jnrpop said:
Stumbled across these, a cheap, small little buck driver.
I've ordered a few to see what they are capable off,
Anyone else used or have testing results on them??

Some info:
17mm x 11mm x 3.8mm
Model Name: Mini-360 (ultra small size DC-DC synchronous rectifier buck module)
Module Properties: Non-isolated buck
Rectification: Synchronous rectification
Input voltage: 4.75V-23V
Output voltage: 1.0V-17V
Output Current: Lowering the value of 3A, long 1.8A
Conversion efficiency: 96% (maximum)
Switching Frequency: 340KHz
Output ripple: 30mV (no-load)
Load regulation: ± 0.5%
Voltage regulation: ± 2.5%
Working temperature: -40~85'C
Features: Use integrally molded power inductor and synchronous rectifier control chip, smaller and more efficient.

Site: https://www.fasttech.com/p/6339500
Click to expand...


Can you sell it to me?
 
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