6XD 5V Input Voltage Limits
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What is the voltage input range for the external 5V input on the 6XD? I am curious because of this line in the documentation:
If 5V is being supplied via the 5V_EXT_IN header then disable the onboard 5V regulator. It is possible to fit the 5V_EXT-5V_SBC jumper to pass this power through to the SBC but it is not recommended because of the drop in voltage on the Duet due to protection circuits. It is better to provide a separate 5V connection to the SBC.
If the 5V supply in question were adjustable, and the 6XD were to allow some fraction of a volt over 5V, would it be possible to overcome the voltage drop from the protection circuitry? I'd like to power the Pi off of a DC/DC converter connected to the 24V supply to ensure power loss detection functions properly, and I'd prefer to not splice together a USB C cable or connect additional components through the SBC cable.
She/Her
I work at a local 3D printing shop.
Printers: Micron+ w/Duet 3 Mini, in-progress adaptation of the Jubilee REL onto an E3D MS, Prusa i3 MK3S. -
@curieos said in 6XD 5V Input Voltage Limits:
If the 5V supply in question were adjustable, and the 6XD were to allow some fraction of a volt over 5V, would it be possible to overcome the voltage drop from the protection circuitry?
Yes. The protection circuitry comprises a Schottky diode between 5V_EXT_IN and the 5V_EXT supply that you can pass to the Pi. This will drop around 0.4V. So you will need to provide about 5.6V from your PSU. Take care not to exceed 5.7V.
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@curieos AFAIR operating the SBC (-> Duet) at 5.2V is fine, but you shouldn't go any higher than that. I think the Meanwell 5V PSU in my printer outputs a bit more than 5V, too.
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@curieos said in 6XD 5V Input Voltage Limits:
If the 5V supply in question were adjustable, and the 6XD were to allow some fraction of a volt over 5V, would it be possible to overcome the voltage drop from the protection circuitry?
Yes. The protection circuitry comprises a Schottky diode between 5V_EXT_IN and the 5V_EXT supply that you can pass to the Pi. This will drop around 0.4V. So you will need to provide about 5.6V from your PSU. Take care not to exceed 5.7V.
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undefined curieos has marked this topic as solved
