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LTM4608 数据表(PDF) 13 Page - Linear Technology |
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LTM4608 数据表(HTML) 13 Page - Linear Technology |
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13 / 24 page  LTM4608 13 4608f APPLICATIONS INFORMATION loop allows the LTM4608 to lock onto CLKIN’s phase as well. The CLKOUT signal can be connected to the CLKIN pin of the following LTM4608 stage to line up both the frequency and the phase of the entire system. Tying the PHMODE pin to SVIN, SGND or SVIN/2 (floating) generates a phase difference (between CLKIN and CLKOUT) of 180°, 120° or 90° respectively, which corresponds to a 2-phase, 3-phase or 4-phase operation. A total of 12 phases can be cascaded to run simultaneously with respect to each other by programming the PHMODE pin of each LTM4608 to different levels. For a 6-phase example in Figure 2, the 2nd stage that is 120° out of phase from the 1st stage can generate a 240° (PHMODE = 0) CLKOUT signal for the 3rd stage, which then can generate a CLKOUT signal that’s 420°, or 60° (PHMODE = SVIN) for the 4th stage. With the 60° CLKIN input, the next two stages can shift 120° (PHMODE = 0) for each to generate a 300° signal for the 6th stage. Finally, the signal with a 60° phase shift on the 6th stage (PHMODE is floating) goes back to the 1st stage. Figure 3 shows the configuration for a 12 phase configuration A multiphase power supply significantly reduces the amount of ripple current in both the input and output capacitors. The RMS input ripple current is reduced by, and the effective ripple frequency is multiplied by, the number of phases used (assuming that the input voltage is greater than the number of phases used times the output voltage). The output ripple amplitude is also reduced by the number of phases used. The LTM4608 device is an inherently current mode con- trolled device. Parallel modules will have very good current sharing. This will balance the thermals on the design. Tie the ITH pins of each LTM4608 together to share the current evenly. To reduce ground potential noise, tie the ITHM pins of all LTM4608s together and then connect to Figure 2. 6-Phase Operation Figure 3. 12-Phase Operation 4608 F02 0 +120 PHASE 1 CLKOUT CLKIN PHMODE 120 PHASE 3 CLKOUT CLKIN PHMODE 240 +180 +120 PHASE 5 CLKOUT CLKIN PHMODE SVIN (420) 60 PHASE 2 CLKOUT CLKIN PHMODE +120 180 PHASE 4 CLKOUT CLKIN PHMODE +120 300 PHASE 6 CLKOUT CLKIN PHMODE 0 +90 PHASE 1 4608 F03 CLKOUT CLKIN PHMODE 90 PHASE 4 CLKOUT CLKIN PHMODE 240 +90 PHASE 9 CLKOUT CLKIN PHMODE 330 PHASE 12 CLKOUT CLKIN PHMODE 180 +90 +90 PHASE 7 CLKOUT CLKIN PHMODE 270 PHASE 10 CLKOUT CLKIN PHMODE +120 +90 (390) 30 PHASE 2 CLKOUT CLKIN PHMODE 120 +90 PHASE 5 CLKOUT CLKIN PHMODE 210 PHASE 8 CLKOUT CLKIN PHMODE 300 +120 +90 PHASE 11 CLKOUT CLKIN PHMODE (420) 60 PHASE 3 CLKOUT CLKIN PHMODE +90 +90 150 PHASE 6 CLKOUT CLKIN PHMODE |
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