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Use of inrush controller in back planes

Hi All,

Can any body explain me necessity of inrush controller in back planes systems?

Noted Thanks.

  • Singamareddy,

    I assume the question is the need for a hotswap control circuit to manage inrush current. Most systems that are 'hot' inserted into a live back plane will have large front end capacitor banks. If Vin to these capacitors is instantaneous, i.e. dv/dt = near infinate, then the inrush current supplied by the backplane will be extremely high. This results in an over current on the backplane PSU with potential shutdown, Vin voltage droop (POR trips on any IC tied to this voltage plane - i.e system shutdown), connector contact arcing (degredation of contacts), Initial voltage spikes that will exceed ratings of ICs and result in failures, etc, etc. Many bad things. HSC circuits also perform circuit breaker functions to isolate downstream faults so the rest of the system can still function. There are may other benefits and functions hotswap ICs perform. See www.ti.com/hotswap for futher information on TI's hotswap IC and tutorials.

    Brian