05-26-2019, 07:05 AM
(04-11-2019, 08:41 PM)fysa Wrote: I don't believe the 12v is regulated, so you might have issues when the battery gets toward the lower end, but it's worked well for me for this project (and others).
TalentCell Rechargeable 72W 132WH 12V/11000mAh 9V/14500mAh 5V/26400mAh DC Output Lithium Ion Battery Pack For LED Strip and CCTV Camera, Portable Li-ion Power Bank, Black
Yes, it seems this battery (power bank) has non-regulated output from three Li-Ion cells. So the voltage on 12V pin may be in range of 9..12.6V, may be +/- 0.3V more to this limits due to voltage drop on switches/fuses/contacts/wires.
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12V voltage is not used for the board components except by entry regulators, SY8113. Their datasheet saying that input voltage range is 4.5-16V. Of course, for 5V buck regulator output it has to be more than 5V. Having in mind 80mOhm top switch with a margin, the input voltage should be more than 6.0V to provide enough output current at 5V.At lower voltage the efficiency of SY8113 buck converters is decreasing and the regulators may shutting down due to overheating.
In general, the ROCKPro64 board itself may operate from 9 to 16V DC voltage (make sure there are eliminated any possible spikes above 16V!). If you're using a devices which are supplying from 12V DC in, like a SATA drives, you need to check that devices separately.
I've checked ROCKPro64 schematic. There is a disagreement between Power diagram and DC IN & System power pages. At the first the regulators are designated as SY8113. At second they are TCS4313B. I haven't found the datasheet for TSC313B.
As for SY8113, it seems to me these regulators are OK for the board itself. But if you will try to load all USB ports and connect maximum peripherals, they become overloaded and my shut down suddenly. Not sure for TCS4313B. But this will be extreme case. For most of actual user configurations this circuitry is OK and commercially-efficient.
