Other Parts Discussed in Thread: TPS25985,
Tool/software:
I have an application where a 12V bus is connected to a load with multiple parallel connectors (server power supply with multiple 12V connectors).
Is it supported to perform load sharing in the following topology where the TPS25990/TPS25985 are only tied together by the load: https://i.kane.cx/4S1P9N
Or do the eFuses have to be either tied together immediately (https://i.kane.cx/lTJcxo) or remain fully separate (https://i.kane.cx/ZCjItC) in this application?
The goal is to prevent overload on any of the individual connections in case of a fault.
Following potential situations can occur:
- Not all of the supplied 12V connections are connected. In that case load sharing should still occur and the OCP threshold should be reduced.
- The sink performs internal load balancing across the connectors, so each of the 12V aren't shorted together immediately (not the case with the current server motherboard I'm working with, but a potential issue with other devices)
- Increased connection resistance on one of the connectors causes imbalance beyond what the eFuses can correct
On the other hand, given that this is internal wiring it's unlikely a fault will suddenly develop, so sharing the bus could be acceptable.
