rackmonkey

Ran across this recently and am curious if anyone has used one of the many ebay prebuilt boards built around the MP1584 buck converter.  Seems like a convenient bolt-in solution for powering indicator lamps/LEDs/vactrols etc from 24V rails, or from the +15V rail of a bipolar supply. I’ve always used either voltage dividers or a protoboard circuit w/LM2596 depending on application.

5 boards for ~$6 ain’t bad.

https://www.ebay.com/itm/5pcs-MP1584-3A-Adjustable-DC-Step-Down-Converter-Buck-Module-3-3V-5V-9V-12V-24V/132416728307?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

MP1584 datasheet:

https://www.monolithicpower.com/en/mp1584.html

quiescent current and ripple look good enough for any application you might want to throw at it. Switching frequency is >1MHz, which is high enough to easily filter out or even ignore in some cases.

« Last Edit: June 08, 2020, 11:23:50 AM by rackmonkey »
Whether you think you can or you think you can't, you're probably right.


dogears

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #1 on: June 11, 2020, 03:39:55 PM »
Found some for sale on Mouser under the brand Seeed Studio, mfr. # 106990005. $4.50. Or a similar from DFRobot, Mfr. #:
DFR0570 for $3.13.

rackmonkey

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #2 on: June 11, 2020, 05:30:11 PM »
Thanks, dogears. Were those prices for 5 boards, or singles?
Whether you think you can or you think you can't, you're probably right.

dogears

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #3 on: June 11, 2020, 08:19:22 PM »
Just singles. But the board is clearly the same one. 

Also noticed mouser says that chip is NRND.

trobbins

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #4 on: June 14, 2020, 03:41:20 AM »
The switching frequency is resistor preset to about 900khz.

The inductor and output cap appear to be set up ideally for a low output voltage (<5V), whereas operation at 5-12V may show some non-ideal behaviour unless the inductor size is increased.

rackmonkey

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #5 on: June 15, 2020, 04:09:13 AM »
The switching frequency is resistor preset to about 900khz.

The inductor and output cap appear to be set up ideally for a low output voltage (<5V), whereas operation at 5-12V may show some non-ideal behaviour unless the inductor size is increased.

Good catch. Thanks. Predictable I guess.  i ordered a batch to play with and will post some test results pre and post any changes I make.

cheers
Whether you think you can or you think you can't, you're probably right.

trobbins

Re: Cheap MP1584 Buck Converter board from eBay - anyone tried these?
« Reply #6 on: June 15, 2020, 04:41:31 AM »
Yeh, they look ok so i got 4 ordered the other day too. Thanks for the heads up.


 

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