LTM4623Y 데이터 시트보기 (PDF) - Linear Technology
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LTM4623Y Datasheet PDF : 26 Pages
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LTM4623
Applications Information
0
+90
CLKIN CLKOUT
90
+90
CLKIN CLKOUT
180
+90
CLKIN CLKOUT
270
CLKIN CLKOUT
INTVCC/2
PHMODE
PHASE 1
INTVCC/2
PHMODE
PHASE 2
INTVCC/2
PHMODE
PHASE 3
INTVCC/2
PHMODE
PHASE 4
0
CLKIN CLKOUT
+120
120
CLKIN CLKOUT
+120
240
+180
CLKIN CLKOUT
(420)
60
CLKIN CLKOUT
+120
180
CLKIN CLKOUT
+120
PHMODE
PHASE 1
PHMODE
PHASE 3
INTVCC
PHMODE
PHASE 5
PHMODE
PHASE 2
PHMODE
PHASE 4
INTVCC
Figure 2. 4-Phase, 6-Phase Operation
300
CLKIN CLKOUT
PHMODE
PHASE 6
4623 F02
0.60
1 PHASE
0.55
2 PHASE
3 PHASE
4 PHASE
0.50
6 PHASE
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
DUTY FACTOR (VOUT/VIN)
4623 F03
Figure 3. RMS Input Ripple Current to DC Load Current Ratio as a Function of Duty Cycle
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
reduction as a function of the number of interleaved phases.
Figure 3 shows this graph.
4623fa
For more information www.linear.com/LTM4623
11
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