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Pinguino Micro Power Supply
05-12-2014, 11:57 AM,
#1
Pinguino Micro Power Supply
Hello!
I ordered some stuff at Olimex and built myself an Android-controlled RC-car! Once it is finished, I want to share it here.
https://dl.dropboxusercontent.com/u/2297...r_Demo.mov
It works pretty well, however I overlooked that the Pinguino Micro can only be powered with 5V. Since the battery pack delivers roughly 6V, I currently have to connect it to USB, which is somehow limiting in range Wink
So my question is: Shall I simply not care and hook up the Pinguino Micro to the motor's battery pack, with a electrolytic condensator close in range?
Or should I go the safe route and order a LDO-regulator like this one?
http://uk.farnell.com/texas-instruments/...dp/1215183

Thanks for your thoughts!
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05-12-2014, 12:51 PM,
#2
RE: Pinguino Micro Power Supply
(05-12-2014, 11:57 AM)Analogfilter Wrote: So my question is: Shall I simply not care and hook up the Pinguino Micro to the motor's battery pack, with a electrolytic condensator close in range?
Or should I go the safe route and order a LDO-regulator like this one?
http://uk.farnell.com/texas-instruments/...dp/1215183

Hello,

Your LDO regulator has a dropout voltage of 1.2V, you will have only 4.8V.

Maybe you can try with the forward drop voltage from one or two diodes.
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05-12-2014, 04:05 PM,
#3
RE: Pinguino Micro Power Supply
Or look for a better LDO regulator.

John
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10-12-2014, 02:52 AM,
#4
RE: Pinguino Micro Power Supply
(05-12-2014, 04:05 PM)pingotg Wrote: Or look for a better LDO regulator.

John

Thank you both, will do
Reply
10-12-2014, 04:11 PM,
#5
RE: Pinguino Micro Power Supply
5V on Pinguino-Micro is used for USB-OTG only and the board runs on 3.3V regulated by TI LM1117 on board. I don't expect you provide power to external devices from the board and the board will only take about 30mA running and 80mA writting SD card.

Having said that, it should be no problem feeding the battery output directly to 5V input if you don't do anything with USB at the same time. However, the EMR from the motor can interfere with the board or damage. Besides, the battery voltage 6V may drop to rather low voltage towards the end of running like 4V. So feeding regulated 5V from the 6V battery doesn't seems to be good to me.

If you really want to feed 5V to the board, you may consider TI TPS76950 LDO. It has very low dropout voltage of less than 0.1V and max input voltage 10V providing 100mA current. I'd prefer using TPS76933 to regulate to 3.3V and feed to the board directly. These are SOT23 parts but fixing them on board is surprisingly easy by joining -EN to IN and only 3 wires are needed. Perfect to provide clean 3.3V from wide voltage range.

DJ
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