[chbot] Really good step-down converter...

[Geoff]

I use this little guy a lot:
http://www.electrodragon.com/product/super-mini360-dc-dcsynchronous-rectified-buck-step-module/

I haven't done extensive testing on it like you have (I have some on hand
if you want to test them), but they power all of the micro's in my projects.

Geoffrey

On Wed, Sep 21, 2016 at 1:12 PM, Volker Kuhlmann <list0570 at paradise.net.nz>
wrote:

> So I bought this step-down converter module from an Asian company (not
> alixpress). The main culprit is a Monolithic Power MP1584. Let's see
> about its performance...
>
> Input voltage: 11V
> Input current: 216mA
> Output voltage: 4.97V
> Output current: (over 10ohm) 497mA
> Efficiency: 104% wooot!!
>
> I can do bulk orders for all you guys because I'm nice...
>
> Time to distrust the Tenma benchtop display and to check all the croc
> clips.
>
> This looks better:
>         U in    I in    P in    U out   I out   P out   eff
>          8.98V  0.22mA  1.98mW  5       0       0       ---
>         11.98V  0.23mA  2.76mW  5       0       0       ---
>          8.98V  6.2mA*  55.7mW  4.975V  8.86mA  44.0mW  79.1%
>         11.89V  5.24mA* 62.3mW  4.976V  8.84mA  44.0mW  70.6%
>          8.99V   24mA   216mW   4.97V   40.1mA  199mW   92.4%
>         11.94V   17mA   203mW   4.97V   40.1mA  199mW   98.2%
>          8.4V   278mA   2.335W  4.974V  425mA   2.114W  90.5%
>         11.6V   204mA   2.366W  4.97V   426mA   2.117W  89.5%
> Starting up with load connected and input current limited causes the
> circuit
> to lock up at the input current limit with the output under voltage.
> So if the power-on current can't be met the circuit fails to start.
> Input and output current fluctuate noticably, but output voltage does not.
> Not
> sure what measurement effects are at play here.
> Tiny trimmer difficult to adjust.
> Gets warm at 0.5A, I wouldn't trust the 3A promise.
>
> http://www.hotmcu.com/mp1584-buck-step-down-3a-adjustable-
> regulator-module-p-82.html
> Inductor 6.8uH (unlike pictured).
>
> Volker
>
> --
> Volker Kuhlmann
> http://volker.top.geek.nz/      Please do not CC list postings to me.
>
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