TPS54540
www.ti.com
SLVSBX7 –MAY 2013
Measurements are taken with standard EVM using a 12V input, 3.3V output, and 5A load unless otherwise noted.
60
180
150
120
90
100
50
95
90
85
80
75
70
65
60
40
30
20
60
10
30
0
0
œ10
œ20
œ30
œ40
œ50
œ60
œ30
œ60
œ90
œ120
œ150
œ180
V
= 18 V
18in
IN
Gain
Series1
VIN = 24 V
VIN = 12 V, VOUT = 3.3 V, IOUT = 5 A
Phase
VOUT = 12 V, fsw = 800 kHz
Series3
VIN = 36 V
10
100
1k
10k
100k
1M
C053
Frequency (Hz)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
C024
IO - Output Current (A)
Figure 52. Efficiency vs Output Current
Figure 53. Overall Loop Frequency Response
0.5
0.4
0.3
0.2
0.1
0
0.20
VIN = 12 V, IOUT = 5 A, fsw = 400 kHz
0.15
0.10
0.05
0.00
œ0.05
œ0.10
œ0.15
œ0.20
-0.1
-0.2
-0.3
VIN = 12 V, VOUT = 3.3 V, fsw = 400 kHz
-0.4
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0
5
10
15
20
25
30
35
40
45
C054
C055
Output Current (A)
Input Voltage (V)
Figure 54. Regulation vs Load Current
Figure 55. Regulation vs Input Voltage
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