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tlfong01
tlfong01
2:47 AM
Anyway, I googled and my friend Wiki gave me a detailed explanation, with scary calculus stuff I sadly don't understand much. I vaguely remember that they are related to the S or Z transform. :)
(1) Boost Converter - Wikipedia
https://en.wikipedia.org/wiki/Boost_converter

(2) Buck Converter - Wikipedia
https://en.wikipedia.org/wiki/Buck_converter
I searched EE SE for "XL6009" found a lot of good Q&A. If you have not decided which boost converter to use, I would suggest to try this cheapy XL6009. I worry MT3608 is not powerful enough to drive a motor with steady current 200mA and start/stall current many times more than that.
 
 
4 hours later…
tlfong01
tlfong01
6:53 AM
Your SMPS seems very unusual than the cheapy SMPS hobbyists use. It datasheet seems to say that input can be AC or DC, and also gives the inrush current of 36A/24A. It also appears that the quite compact module has not snubber to suppress inrush current.
Snubber - Wikipedia
https://en.wikipedia.org/wiki/Snubber


Apple iPhone charger teardown: quality in a tiny expensive package
http://www.righto.com/2012/05/apple-iphone-charger-teardown-quality.html
 
tlfong01
tlfong01
7:11 AM
I am using a cheap AliExpress version of the RS SMPS Item 4 below.
(1) RS Pro LDE20-20Bxx AC/DC Converter 20W, AC-DC converter
https://docs.rs-online.com/6d0b/0900766b816b4d81.pdf

(2) RS PRO, 20W Plug In Power Supply 5V dc, 4A, SMPS - HK$153
https://hkcn.rs-online.com/web/p/ac-dc-adapters/1440954/

(3) RS Power Supplies Selection Guide - RS
https://docs.rs-online.com/1563/0900766b816fb6d5.pdf

(4) RS PRO, 240W Embedded Switch Mode Power Supply SMPS, 12V dc, Enclosed - RS £50
https://uk.rs-online.com/web/p/embedded-switch-mode-power-supplies-smps/1618225/?relevancy-data=7365617263685F636173636164655F6F726465723D31267365617263685F696E746572666163655F6E616D6…
 

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