I am trying to use an Electron without a battery.
My configuration has an Electron that gets 5VDC from a TI reference design switch mode power supply PCB, applied to the Electron’s Vin. The SMPS is capable of supplying 3A. In the real world, the SMPS will be sourced from a 12V battery on a boat. It is currently hooked to a lab power supply delivering 12VDC at up to 3 Amps.
When I connect the 12VDC to the board, the 5VDC comes up to 5.0 Volts, but the Electron does not start up. I get a dim red LED. The 3.3V pin reads 1.4VDC. So. figuring the 5V did not have enough current capacity, I tested the 5VDC supply. I was able to draw 2.5Amps (while it was still connected to the Electron), though with the 5VDC sagging to 4.5VDC. I attached a 330uF capacitor to output of SMPS and that did not change anything.
However, if I then connect the battery, the Electron comes up. If I subsequently disconnect the battery, the Electron stays running (and I get the rapidly blinking red LED since no battery is attached).
Is there some sort of startup sequencing I need to do?
Any thoughts appreciated.