Based on the X‑NUCLEO‑IHM08M1 user manual, the board is specified to support a maximum DC voltage of up to 48 V.
- Does this imply that the board can only be operated safely at a lower voltage (around 40 V) to maintain sufficient margin and avoid instability?
In my setup, I frequently observe over-voltage (OVP) faults, especially when operating close to the upper voltage limit.
From the MCSDK tool, I understand that "By default, the over-voltage protection threshold is set to approximately Bus Voltage + 20%"
- If the system is running at 48 V, the default OVP threshold would be ~57.6 V, which exceeds the board’s absolute voltage rating.
- When I manually set the OVP threshold closer to 48 V, I experience frequent OVP trips, likely due to bus voltage spikes
I also observe a related behavior with over-current protection (OCP):
- When OVP is disabled to avoid OVP trips,
- The system instead begins to trigger OCP faults very frequently, especially while operating at 48 V
My questions are:
1. Does this behavior imply that the 48 V rating is only an absolute maximum and not a practical operating voltage?
2. Is it expected that, operating near 48 V results in frequent OVP or OCP faults due to limited margin?
3. Does this mean the X‑NUCLEO‑IHM08M1 is not suitable for stable operation at 48 V in real applications?
4. If operating at 48 V is required, what are the recommended approaches?
(MCSDK Version: 6.4.2 Build: 260313.022202, STM32H563 NUCLEO, X‑NUCLEO‑IHM08M1)
