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SLUU186 − March 2004
11
TPS40055-Based Design Converts 12-V Bus to 1.8 V at 15 A (HPA070)
6 Test Results / Performance Data
6.1 Efficiency and Power Loss
Figure 3 shows the efficiency as the load is varied from 1 A to over 15 A. The typical efficiency remains over
90% as the load ranges from 3 A to 12 A.
Figure 3
0
88
78
2
86
80
90
94
4681012 14 16
82
84
92
I
OUT
− Output Current − A
Efficiency − %
EFFICIENCY
vs
LOAD
Figure 4
0
0
2
4
1
2
3
4 6 8 10121416
5
6
7
I
OUT
− Output Current − A
P
DISS
− Power Dissipation − W
POWER DISSIPATION
vs
LOAD
6.2 Closed Loop Performance
100 100 k10 k1 k
20
−30
10
−20
30
50
−10
0
40
100
0
80
20
120
160
40
60
140
f − Frequency − kHz
Gain − dB
Phase − °
OVERALL GAIN AND PHASE
vs
FREQUENCY
Gain
Phase
Figure 5.