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TPS2413DR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS2413DR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page TPS2412 vs TPS2413 – MOSFET CONTROL METHODS N+1 POWER SUPPLY – TYPICAL CONNECTION Concept Input Voltage Power Bus Implementation DC/DC Converter DC/DC Converter TPS2412 TPS2413 www.ti.com.......................................................................................................................................... SLVS728B – JANUARY 2007 – REVISED SEPTEMBER 2008 The TPS2412 control method yields several benefits. First, the low-current GATE driver provides a gentle turn-on and turn-off for slowly rising and falling input voltage. Second, it reduces the tendency for on/off cycling of a comparator based solution at light loads. Third, it avoids reverse currents if the fast turn-off threshold is left positive. The drawback to this method is that the MOSFET appears to have a high resistance at light load when the regulation is active. A momentary output voltage droop occurs when a large step load is applied from a light-load condition. The TPS2412 is a better solution for a mid-rail bus that is re-regulated. The TPS2413 turns the MOSFET on if V(AC) is greater than 10 mV, and the rapid turn-off is activated at the programmed negative threshold. There is no linear control range and slow turn-off. The disadvantage is that the turn-off threshold must be negative (unless a minimum load is always present) permitting a continuous reverse current. Under a dynamic reverse voltage fault, the lower threshold voltage may permit a higher peak reverse current. There are a number of advantages to this control method. Step loads from a light load condition are handled without a voltage droop beyond I × R. If the redundant converter fails, applications with redundant synchronous converters may permit a small amount of reverse current at light load in order to assure that the MOSFET is all ready on. The TPS2413 is a better solution for low-voltage buses that are not re-regulated, and that may see large load steps transients. These applications recommendations are meant as a starting point, with the needs of specific implementations over-riding them. The N+1 power supply configuration shown in Figure 12 is used where multiple power supplies are paralleled for either higher capacity, redundancy or both. If it takes N supplies to power the load, adding an extra, identical unit in parallel permits the load to continue operation in the event that any one of the N supplies fails. The supplies are ORed together, rather than directly connected to the bus, to isolate the converter output from the bus when it is plugged-in or fails short. The TPS2412/13 with an external MOSFET emulates the function of the ORing diode. 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 (e.g. 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 12. N+1 Power Supply Example Copyright © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS2412 TPS2413 |
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