3 ms·
It is a pretty clever design > When it is detected that the PDB starts to detach from the interface, the hot-swap controller quickly turns off the MOSFET to bl
by rdtsc 7mo ago
It is a pretty clever design
> When it is detected that the PDB starts to detach from the interface, the hot-swap controller quickly turns off the MOSFET to block the discharge path from Cin to the system. After the main power path is completely disconnected, the interface is physically detached, and no current flows at this time
> For insertion, long pins (typically for ground and control signals) make contact first to establish a
stable reference and enable pre-insertion checks, while short pins (for power or sensitive signals)
connect later once conditions are safe; during removal, the sequence is reversed, with short pins
disconnecting first to minimize interference.
- Animats 7mo agoYes, I read that. There had better be a backup system. MOSFETs tend to fail ON, and there's a megawatt going into each rack. Somehow this seems the wrong approach to AI.
- superxpro12 7mo agoFail spectacularly Data center workers are gonna need those big yoink sticks and those thick arc-fault bibs that furnace operators wear.
- Animats 7mo agoMcMaster-Carr has the personal protective equipment required for 800V: Flash protection face shields [1] and Class 0 electrical protection gloves.[2] It's not that bad. It's just ordinary industrial protective gear. [1] https://www.mcmaster.com/products/arc-flash-protection-face-shields/ https://www.mcmaster.com/products/arc-flash-protection-face-... [2] https://www.mcmaster.com/products/electrical-protection-gloves/gloves-2~/ https://www.mcmaster.com/products/electrical-protection-glov...
- rdtsc 7mo agoI figure the latch-up failure mode is a known failure mode. It's not something totally unexpected. > Somehow this seems the wrong approach to AI. One a more ironic level, it's seems on par with the whole AI approach!
- contravariant 7mo agoThe phrase "when it is detected" makes me nervous.
- rdtsc 7mo agoThat's why I included the bottom part describing how some pins are longer than others. It's sort of how some hotplugs work in most cases. First ground connects, then other set of pins and so on. So when is detected a physical act of being disconnected.