Power Supply - Sferalabs Iono Pi Max v2 3+ Lite User Manual

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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 10.0 V to 50.0 V, 3 A max input current.

Respect the correct polarity shown in the schematic diagram (+ -). The power supply

circuit implements reverse polarity protection using auto resetting fuses and surge

protection. The resetting fuse threshold is 3.3 A at 20 C 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 5 V main regulator. This regulator supplies all internal voltages, including the battery

charger voltage, but not the VSO (auxiliary regulated 12-24 Vdc output) regulator voltage,

that draws directly from VIN or battery and can deliver up to 8 W.

When the input voltage is below 24 V, 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.

Iono Pi Max User Guide

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