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LTM4623 Datasheet(PDF) 11 Page - Linear Technology |
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LTM4623 Datasheet(HTML) 11 Page - Linear Technology |
11 / 26 page LTM4623 11 4623fa For more information www.linear.com/LTM4623 The output ripple amplitude is also reduced by the number of phases used when all of the outputs are tied together to achieve a single high output current design. The LTM4623 device is an inherently current mode con- trolled device, so parallel modules will have very good current sharing. This will balance the thermals on the design. Please tie the RUN, TRACK/SS, FB and COMP pins of each paralleling module together. Figure 26 shows an example of parallel operation and pin connection. Input RMS Ripple Current Cancellation Application Note 77 provides a detailed explanation of multiphase operation. The input RMS ripple current can- cellation mathematical derivations are presented, and a graph is displayed representing the RMS ripple current reductionasafunctionofthenumberofinterleavedphases. Figure 3 shows this graph. applicaTions inForMaTion Figure 2. 4-Phase, 6-Phase Operation Figure 3. RMS Input Ripple Current to DC Load Current Ratio as a Function of Duty Cycle 0.75 0.8 4623 F03 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.85 0.9 DUTY FACTOR (VOUT/VIN) 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 1 PHASE 2 PHASE 3 PHASE 4 PHASE 6 PHASE 4623 F02 CLKIN PHMODE CLKOUT 0 90 180 270 +90 +90 +90 PHASE 4 PHASE 3 PHASE 2 PHASE 1 INTVCC/2 INTVCC/2 INTVCC/2 INTVCC/2 CLKIN PHMODE CLKOUT CLKIN PHMODE CLKOUT CLKIN PHMODE CLKOUT CLKIN PHMODE CLKOUT 120 240 (420) 60 180 +120 +180 +120 PHASE 4 PHASE 2 PHASE 5 INTVCC INTVCC PHASE 3 CLKIN PHMODE CLKOUT CLKIN PHMODE CLKOUT CLKIN PHMODE CLKOUT 300 +120 PHASE 6 CLKIN PHMODE CLKOUT 0 PHASE 1 CLKIN PHMODE CLKOUT +120 |
Similar Part No. - LTM4623_15 |
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Similar Description - LTM4623_15 |
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