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PT4483 Datasheet(PDF) 4 Page - Texas Instruments |
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PT4483 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 7 page For technical support and more information, see inside back cover or visit www.ti.com Application Notes Increasing the Output Current of the PT4482 with the PT4499 Compatible Current Booster The PT4499 is a 30-A “Current Booster” module designed specifically for the PT4482 programmable DC/DC converter. The booster is controlled directly by the regulator, and effectively adds an additional output stage that operates in parallel. This allows the system to run sychronously, providing a low noise solution. Up to two booster modules can be connected to a PT4482 converter. Each booster module increases the available output current by 30A. A combination of one PT4482 converter and two PT4499 booster modules can supply up to 90A of output current; enough to supply virtually any multi-processor application. Figure 1-1 shows the connection schematic for the regulator and current booster combination. A current booster is not a stand-alone product, and can only operate with a regulator. It is housed in the same package as its compatible regulator, and shares the same mechanical outline. Except for an increase in output current, the overall performance of a converter/booster combination is identical to that of a stand-alone converter. Figure 1-1; Current Booster Application Schematic Table 1-1; Booster Pin-Out Information Pin Function Pin Function Pin Function 1+Vin 10 +Vout 19 –Vout 2–Vin 11 +Vout 20 (–)Vsense 3 Do not connect 12 +Vout 21 Do not connect 4Vr 13 +Vout 22 Do not connect 5Va 14 –Vout 23 Do not connect 6 Do not connect 15 –Vout 24 Do not connect 7 Do not connect 16 –Vout 25 Do not connect 8+Vout 17 –Vout 26 DRV 9+Vout 18–Vout Notes: 1. Refer to the PT4482 specification table for the performance of the regulator/booster combination. 2. The pin-out of the current booster modules include a number pins identified, “Do not connect” (see Table 1-1). These pins are not connected internally to the module but must be soldered to a pad to preserve the unit’s mechanical integrity. 3. A minimum of 330µF of output capacitance is required across the output of each PT4499 booster for proper operation. A value greater than 330µF will further reduce transients due to large and/or fast load steps. 4. The converter and all boosters must be located on the same printed circuit board. A similar footprint and trace layout for each module will also facilitate current sharing. PT4482, PT4499 PT4499 PT4482 1 2 8 - 13 –V IN -V OUT +V OUT 20 7 REMOTE SENSE (+) REMOTE SENSE (-) VID0 VID1 VID2 VID3 PROGRAMMING PINS Inhibit 3 C IN 33µF Optional + C IN 33µF Optional + LOAD 1 8 - 13 14 - 19 +V IN 25 VID4 24 23 22 21 14-19 2 4526 20 4526 C OUT 330µF Optional + C OUT 330µF Required 3 + |
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