Power Supply - Sferalabs Iono Pi Max Series User Manual

THE IONO PI TOP CIRCUIT BOARD WITH TERMINAL BLOCKS

Power supply

Iono Pi Max can be powered with DC voltage only:
✓ DC: nominal voltage range 10.0V to 50.0V.
Respect the correct polarity shown in the schematic diagram (+ -). The power supply
circuit implements reverse polarity protection using auto resetting fuses and surge
protection up to ±1000V (line to earth, common mode) 1.2/50μs. The resetting fuse
threshold is 3.3A at 20C ambient temperature.
The PWR color LED, visible through the front panel of the DIN-rail case, is lit when power
supply is available.
The Iono Pi Max power supply stage is optimised to deliver up to 30W total power through
its 5V main regulator. This regulator supplies all internal voltages, including the battery
charger voltage, but not the VSO (auxiliary regulated 12-24Vdc output) regulator voltage,
that draws directly from VIN or battery and can deliver up to 8W.
When the input voltage is below 24V, if the total power demand is very high from both the
main regulator and the VSO output, the input current threshold limit could be exceeded,
causing the resettable fuse to trip.
19 Iono Pi Max User Guide