<div dir="ltr">I use this little guy a lot:<div><a href="http://www.electrodragon.com/product/super-mini360-dc-dcsynchronous-rectified-buck-step-module/">http://www.electrodragon.com/product/super-mini360-dc-dcsynchronous-rectified-buck-step-module/</a><br></div><div><br></div><div>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.</div><div><br></div><div>Geoffrey</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Sep 21, 2016 at 1:12 PM, Volker Kuhlmann <span dir="ltr"><<a href="mailto:list0570@paradise.net.nz" target="_blank">list0570@paradise.net.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So I bought this step-down converter module from an Asian company (not<br>
alixpress). The main culprit is a Monolithic Power MP1584. Let's see<br>
about its performance...<br>
<br>
Input voltage: 11V<br>
Input current: 216mA<br>
Output voltage: 4.97V<br>
Output current: (over 10ohm) 497mA<br>
Efficiency: 104% wooot!!<br>
<br>
I can do bulk orders for all you guys because I'm nice...<br>
<br>
Time to distrust the Tenma benchtop display and to check all the croc<br>
clips.<br>
<br>
This looks better:<br>
U in I in P in U out I out P out eff<br>
8.98V 0.22mA 1.98mW 5 0 0 ---<br>
11.98V 0.23mA 2.76mW 5 0 0 ---<br>
8.98V 6.2mA* 55.7mW 4.975V 8.86mA 44.0mW 79.1%<br>
11.89V 5.24mA* 62.3mW 4.976V 8.84mA 44.0mW 70.6%<br>
8.99V 24mA 216mW 4.97V 40.1mA 199mW 92.4%<br>
11.94V 17mA 203mW 4.97V 40.1mA 199mW 98.2%<br>
8.4V 278mA 2.335W 4.974V 425mA 2.114W 90.5%<br>
11.6V 204mA 2.366W 4.97V 426mA 2.117W 89.5%<br>
Starting up with load connected and input current limited causes the circuit<br>
to lock up at the input current limit with the output under voltage.<br>
So if the power-on current can't be met the circuit fails to start.<br>
Input and output current fluctuate noticably, but output voltage does not. Not<br>
sure what measurement effects are at play here.<br>
Tiny trimmer difficult to adjust.<br>
Gets warm at 0.5A, I wouldn't trust the 3A promise.<br>
<br>
<a href="http://www.hotmcu.com/mp1584-buck-step-down-3a-adjustable-regulator-module-p-82.html" rel="noreferrer" target="_blank">http://www.hotmcu.com/mp1584-<wbr>buck-step-down-3a-adjustable-<wbr>regulator-module-p-82.html</a><br>
Inductor 6.8uH (unlike pictured).<br>
<span class="HOEnZb"><font color="#888888"><br>
Volker<br>
<br>
--<br>
Volker Kuhlmann<br>
<a href="http://volker.top.geek.nz/" rel="noreferrer" target="_blank">http://volker.top.geek.nz/</a> Please do not CC list postings to me.<br>
<br>
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