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PT4481C Datasheet(PDF) 4 Page - Texas Instruments |
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PT4481C Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes PT4481 Configuring PT4481 DC/DC Converters for N+1 Operation ‘N+1’ vs OR’ing The PT4481 DC/DC converter modules may be operated with other PT4481 modules in ‘N+1’ configurations. A simple OR’ing connection allows a number of converters to share the load current. An ‘N+1’ configuration adds redundancy by employing at least one more converter than is necessary to supply the load. This ensures that upon the loss of one converter, sufficient capacity remains to supply the load without interruption. As an example, a 45-A load configured for ‘N+1’ would require no less than three PT4481 converters. Two are needed to meet the load demand, plus one additional converter to ensure redundancy. Figure 1-1 shows the schematic for operating two PT4481 converters in an ‘N+1’ configuration for a 25-A load application. Blocking Diodes A true ‘N+1’ redundant system must also protect the output bus against fault current back-feeding a con- verter. Without a blocking diode, a converter will sink current as a result of a fault at its output, or due to the loss of its input source. The blocking diodes 4, (D1 PT4481 PT4481 1 2 8–13 20 7 REMOTE SENSE (+) REMOTE SENSE (–) PROGRAMMING PINS 3 C OUT, 330µF (Required) + 18–13 14–19 25 24 23 22 21 14–19 2 626 20 626 7 REMOTE SENSE (+) 21 22 23 24 25 3 PROGRAMMING PINS D 2, OR'ing Diode (Required) –V IN +V IN 25-A LOAD Inhibit –V OUT +V OUT +V IN –V IN +V OUT –V OUT VID4 – VID0 +Sns –Sns Share Sync Inhibit –Sns Share Sync Inhibit +Sns +V IN –V IN +V OUT –V OUT VID4 – VID0 C IN C IN D 1, OR'ing Diode (Required) F1 F2 C OUT, 330µF (Required) + Figure 1-1; Connection Schematic for Operation in Parallel/N+1 Configuration & D2 in Figure 1-1), protect against reverse current flow under such conditions. Notes 1. For ‘N+1’ redundancy, always use one more converter than is required to supply the load. 2. The VID pins for all converter modules must be independently set to the same voltage program code. 3. All converters connected for ‘N+1’ operation must be located on the same printed circuit board. A similar footprint and trace layout for each converter will facilitate current sharing. 4 A number of high-current rectifier diodes are available with a low forward voltage drop. They are specifically designed for OR’ing applications in ‘N+1’ systems. Eg. The 82CNQ030, and MBRB2515. 5. As a result of excess capacity and the losses in the blocking diodes, system efficiency is reduced. 6. The interconnection of pin 6 (Sync), and pin 26 (Share) between all modules are required for load current sharing and operation at a common frequency. |
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