This document introduces the AdvancedTCA Hot Swap Controller, which can ease power distribution design. The controller is suitable for 200W applications and features current limiting, current and voltage monitoring, etc.
The document presents a circuit solution for the AdvancedTCA modular computing architecture, utilizing the LTC4252A controller to handle up to 200W per front board. It addresses specific requirements such as card-centric inrush limiting and current/voltage monitoring within -48V dual battery feed systems typical of telecom installations.
Key design features include precise current limiting set to at least 5.5A, overvoltage protection turning off at –74.7V, undervoltage thresholds between –37V and –33.3V, and a soft-start mechanism that pauses for 230ms after insertion detection. The note also details the handling of Zero Volt Transients to ensure uninterrupted operation during brief input voltage dropouts.
The system allows a power draw of up to 200W per front board.
The accurate current limit provides at least 5.5A under all conditions.
The LTC4252A pauses for 230ms to allow for contact bounce.