ISL6398 Datasheet, PDF (49/57 Pages) Intersil Corporation – Programmable soft-start rate and DVID rate

ISL6398
TABLE 18. VOUT_MAX (24h) in 5MV/STEP MODE (Continued)
VOUT (V)
Code
(HEX)
VOUT (V)
Code
(HEX)
VOUT (V)
Code
(HEX)
0.635
4E
1.275
CE
1.915
14E
0.640
4F
1.280
CF
1.920
14F
0.645
50
1.285
D0
1.925
150
0.650
51
1.290
D1
1.930
151
0.655
52
1.295
D2
1.935
152
0.660
53
1.300
D3
1.940
153
0.665
54
1.305
D4
1.945
154
0.670
55
1.310
D5
1.950
155
0.675
56
1.315
D6
1.955
156
0.680
57
1.320
D7
1.960
157
0.685
58
1.325
D8
1.965
158
0.690
59
1.330
D9
1.970
159
0.695
5A
1.335
DA
1.975
15A
0.700
5B
1.340
DB
1.980
15B
0.705
5C
1.345
DC
1.985
15C
0.710
5D
1.350
DD
1.990
15D
0.715
5E
1.355
DE
1.995
15E
0.720
5F
1.360
DF
2.000
15F
0.725
60
1.365
E0
2.005
160
0.730
61
1.370
E1
2.010
161
0.735
62
1.375
E2
2.015
162
0.740
63
1.380
E3
2.020
163
0.745
64
1.385
E4
2.025
164
0.750
65
1.390
E5
2.030
165
0.755
66
1.395
E6
2.035
166
0.760
67
1.400
E7
2.040
167
0.765
68
1.405
E8
2.045
168
0.770
69
1.410
E9
2.050
169
0.775
6A
1.415
EA
2.055
16A
0.780
6B
1.420
EB
2.060
16B
0.785
6C
1.425
EC
2.065
16C
0.790
6D
1.430
ED
2.070
16D
0.795
6E
1.435
EE
2.075
16E
0.800
6F
1.440
EF
2.080
16F
0.805
70
1.445
F0
2.085
170
0.810
71
1.450
F1
2.090
171
0.815
72
1.455
F2
2.095
172
0.820
73
1.460
F3
2.100
173
0.825
74
1.465
F4
2.105
174
TABLE 18. VOUT_MAX (24h) in 5MV/STEP MODE (Continued)
VOUT (V)
Code
(HEX)
VOUT (V)
Code
(HEX)
VOUT (V)
Code
(HEX)
0.830
75
1.470
F5
2.110
175
0.835
76
1.475
F6
2.115
176
0.840
77
1.480
F7
2.120
177
0.845
78
1.485
F8
2.125
178
0.850
79
1.490
F9
2.130
179
0.855
7A
1.495
FA
2.135
17A
0.860
7B
1.500
FB
2.140
17B
0.865
7C
1.505
FC
2.145
17C
0.870
7D
1.510
FD
2.150
17D
0.875
7E
1.515
FE
2.155
17E
0.880
7F
1.520
FF
General Design Guide
This design guide is intended to provide a high-level explanation of
the steps necessary to create a multiphase power converter. It is
assumed that the reader is familiar with many of the basic skills
and ‘techniques referenced in the following. In addition to this
guide, Intersil provides complete reference designs, which include
schematics, bills of materials, and example board layouts for
multi-phase VR applications.
Power Stages
The first step in designing a multiphase converter is to determine
the number of phases. This determination depends heavily upon
the cost analysis, which in turn depends on system constraints
that differ from one design to the next. Principally, the designer
will be concerned with whether components can be mounted on
both sides of the circuit board; whether through-hole components
are permitted; and the total board space available for power
supply circuitry. Generally speaking, the most economical
solutions are those in which each phase handles between 15A
and 25A. All surface mount designs will tend toward the lower
end of this current range. If through-hole MOSFETs and inductors
can be used, higher per-phase currents are possible. In cases
where board space is the limiting constraint, current can be
pushed as high as 40A per phase, but these designs require heat
sinks and forced air to cool the MOSFETs, inductors and heat
dissipating surfaces.
MOSFETs
The choice of MOSFETs depends on the current each MOSFET will
be required to conduct; the switching frequency; the capability of
the MOSFETs to dissipate heat; and the availability and nature of
heat sinking and air flow.
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August 13, 2015