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
IOUT − Output Current − A
Percent Efficiency − %
OVERALL EFFICIENCY
vs
OUTPUT CURRENT
Figure 8.
VIN = 12 V
fSW = 420 kHz
0
20
30
40
5
15
25
35
10
0
20
40
60
80
100
120
IOUT − Output Current − A
P
LOSS
− Power Loss − W
TOTAL POWER LOSS
vs
OUTPUT CURRENT
Figure 9.
VIN = 12 V
fSW = 420 kHz
