Texas Instruments TPS7H4011QEVM-CVAL User Manual page 11

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3.8 Current Sharing
When multiple devices are in parallel, the best mode of operation is for all devices to deliver the same amount of
current to the load. Since the main factor in current sharing equality is the proportional relationship between the
power stage transconductance (g
of any implementation is dependent on the g
The EVM was modified by placing a wire between the inductor and VOUT plane of the EVM to allow current
probes to measure the RMS current of each phase during operation. Table
The second column shows the target RMS current per device, that is the current through each converter if the
sharing was equal. The last four columns show the deviation for each device from the target current sharing
value as a percentage of the target device current.
Because the current sharing performance of any set of devices is dependent on the g
has different current sharing characteristics. Therefore, the data provided in
TPS7H4011QEVM-CVAL boards.
Total Target Device 1
Current (A) Current Per
Device (A)
2.03 0.51
3.03 0.76
3.93 0.98
5.11 1.28
6.29 1.57
7.25 1.81
8.25 2.06
9.22 2.31
10.19 2.55
14.70 3.67
19.44 4.86
24.28 6.07
29.27 7.32
34.12 8.53
38.35 9.59
42.75 10.69
46.94 11.74
SLVUD11 – MARCH 2025
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in the device data sheet) of each device, the current sharing performance
mps
values of the devices in the parallel system.
mps
Table 3-2. Current Sharing Data
RMS Current Per Device (A)
Device 2 Device 3
0.51 0.51 0.48
0.77 0.76 0.72
1.01 0.98 0.95
1.31 1.27 1.24
1.62 1.56 1.54
1.87 1.79 1.78
2.12 2.04 2.03
2.37 2.27 2.28
2.63 2.51 2.52
3.79 3.61 3.64
5.01 4.78 4.83
6.26 5.97 6.03
7.53 7.19 7.28
8.78 8.38 8.49
9.88 9.41 9.54
11.02 10.48 10.62
12.11 11.49 11.65
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Table 3-2
Table 3-2
Deviation From Target Current (%)
Device 4 Device 1 Device 2
1.46% 0.13%
0.53
2.06% -0.33%
0.78
2.50% -0.41%
1.00
2.72% -0.91%
1.29
2.97% -1.09%
1.58
2.97% -1.23%
1.81
2.93% -1.18%
2.06
2.96% -1.50%
2.30
3.05% -1.51%
2.54
3.17% -1.73%
3.65
3.19% -1.73%
4.82
3.05% -1.72%
6.03
2.91% -1.74%
7.27
2.97% -1.79%
8.47
3.04% -1.88%
9.53
3.09% -1.91%
10.63
3.17% -2.06%
11.69
TPS7H4011QEVM-CVAL Evaluation Module
Implementation Results
shows the collected data.
values, each EVM
mps
is not the same as other
Device 3 Device 4
-5.95% 4.36%
-4.35% 2.62%
-3.50% 1.41%
-2.61% 0.80%
-2.02% 0.14%
-1.63% -0.11%
-1.55% -0.20%
-1.25% -0.21%
-1.19% -0.35%
-0.83% -0.61%
-0.70% -0.77%
-0.60% -0.74%
-0.53% -0.64%
-0.50% -0.68%
-0.53% -0.64%
-0.63% -0.55%
-0.72% -0.38%
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