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TPS2412DG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS2412DG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 29 page LOAD Implementation Backplane PowerBuses Plug-InUnit Common Buses Concept Hotswap DC/DC Converter Concept Input Voltage Power Bus Implementation DC/DC Converter DC/DC Converter TPS2412, TPS2413 www.ti.com SLVS728C – JANUARY 2007 – REVISED NOVEMBER 2015 Feature Description (continued) It is possible for a malfunctioning converter in an ORed topology to create a bus overvoltage if the loading is less than the converter's capacity (for example, N = 1). The ORed topology shown cannot protect the bus from this condition, even if the ORing MOSFET can be turned off. One common solution is to use two MOSFETs in a back-to-back configuration to provide bidirectional blocking. The TPS2412/13 does not have a provision for forcing the gate off when the overvoltage condition occurs, use of the TPS2410/11 is recommended. ORed supplies are usually designed to share power by various means, although the desired operation could implement an active and standby concept. Sharing approaches include both passive, or voltage droop, and active methods. Not all of the output ORing devices may be ON depending on the sharing control method, bus loading, distribution resistances, and TPS2412/13 settings. Figure 9. N+1 Power Supply Example 8.3.4 Input ORing – Typical Connection Figure 10 shows how redundant buses may be ORed to a common point to achieve higher reliability. It is possible to have both MOSFETs ON at once if the bus voltages are matched, or the combination of tolerance and regulation causes both TPS2412/13 circuits to see a forward voltage. The ORing MOSFET disconnects the lower-voltage bus, protecting the remaining bus from potential overload by a fault. Figure 10. Example ORing of Input Power Buses Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS2412 TPS2413 |
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