B-G431B-ESC1 20vdc Max?

[BFalcon]

Oddly the on board NFETS are rated 60v, why only 20v input? Can we safely go to +48vdc, if not why? Our motor driven FW the voltage does not go above Vbus.

Is FOC space vector 7 phase or 5 phase switched?

Thanks

[BFalcon]

Anybody at ST knows why 20v is the rated bus voltage for the kit?

[Ozone]

At least the L7986 step-down regulator (U9) is only specified up to 38V.

[BFalcon]

Hard to imagine only 38v when the market has gone to 48v on almost all motor drives.

[waclawek.jan]

There's a 26V TVS right at the input...

I'd say the capacitors' rating may be limiting, too.

Maybe you want to contact ST directly, through web support form or through FAE.

JW

[waclawek.jan]

From the BOM:

C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40

15uFCAP CER 15UF 35V X5R 0805

There may be other critical capacitor, too.

The BAT30 Schottky is 30V rated; I'm not sure whether that's limiting or not.

JW

[BFalcon]

Perhaps it's more of a hobby EVM targeted for 20v drone motors.

[waclawek.jan]

Yes, but as you've hinted, it's a pity.

48V is maybe a bit much, but 24V (nominally; in fact it's more up to 30V) is quite common in industrial and semi-industrial settings. With a bit of attention, the board's utility might've been extended.

JW

[Saurabh SONA]

Going by the listed specs and size, the board indeed seems to be designed specifically for RC Drone applications powered by up to 6S LiPo battery packs.

The form factor required for these applications may be hard to meet with higher voltage rated capacitors etc.

For higher voltage ratings there is already X-NUCLEO-IHM08M1 (48V max) which can be used with NUCLEO-G431RB or other NUCLEO boards.

[EWu.1]

BEMF may double the VCC so it can not use in DC 48V， If you want to work under 48V .That need to modify all Schematch

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