Current Limiting for Redundant Power Systems

The new TPS2359 hot-plug controller integrates all of the power management functions for two AdvancedMC (AMC) modules. Its current limiting circuitry enables designers to meet tight AMC requirements. This is relevant because many applications use redundant supplies. A unique feature called multiswap maintains a fixed current limit, regardless o
Current Limiting for Redundant Power Systems - schematic

f the number of supplies connected to the load. The Advanced Telecom Computing Architecture (ATCA) standard provides a modular approach to designing telecom equipment. Adoption of this industry standard speeds product design and simplifies field upgrades. In the ATCA architecture, each carrier blade is required to contain up to eight AMC modules. These modules require hot-plug protection. The carrier board distributes two main power supplies to each AMC module: a 3. 3V management power supply, and a 12V payload power supply. In order to help designers meet these requirements, the TPS2359, a full featured dual-slot AdvancedMC controller was designed to provide all of the protection and monitoring circuitry required to support two AMC modules. The controller fully integrates management power inrush control, over-current protection, and FET ORing. Adding two external power transistors provides each payload power channel all of these same features. Figure 1 shows a simplified block diagram of a two-channel AMC application where both channels draw from common supplies. They can also draw from independent supplies. This unique controller integrates accurate current limiting for payload and management power channels. The payload power current limit uses three external resistors per channel to implement the 8. 25A +/ 10% ATCA specification. The management power current limit uses one external resistor per channel to set the 195mA...

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