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SLUU195 − June 2004
15
TPS40090 Multi-Phase Buck Converter and TPS2834 Drivers Steps-Down from 12-V to 1.5-V at 100 A
6 Test Results and Performance Data
6.1 Efficiency and Power Loss
Figure 8 shows the efficiency as the load varies from 10 A to over 100 A. The efficiency at full
load is about 84.3%.
Figure 7 shows the total loss versus the load current, which is approximately 28.3W at 100 A.
0
65
20
75
70
80
85
90
40 60 80 100 120
I
OUT
− Output Current − A
Percent Efficiency − %
OVERALL EFFICIENCY
vs
OUTPUT CURRENT
Figure 8.
V
IN
= 12 V
f
SW
= 420 kHz
0
20
30
40
5
15
25
35
10
0 20 40 60 80 100 120
I
OUT
− Output Current − A
P
LOSS
− Power Loss − W
TOTAL POWER LOSS
vs
OUTPUT CURRENT
Figure 9.
V
IN
= 12 V
f
SW
= 420 kHz