TPS54540
SLVSBX7 –MAY 2013
www.ti.com
Measurements are taken with standard EVM using a 12V input, 3.3V output, and 5A load unless otherwise noted.
I
= 100 mA
I
= 1 A
OUT
EN Floating
OUT
EN Floating
V
V
V
V
IN
IN
OUT
OUT
Time = 40 ms/div
Time = 40 ms/div
Figure 46. Low Dropout Operation
Figure 47. Low Dropout Operation
100
90
80
70
60
50
40
30
20
10
0
100
95
90
85
80
75
70
65
60
IN=6V
VIN = 7 V
V
= 12 V
IN=12V
IN
VOUT = 5 V, fsw = 400 kHz
IN=24V
VIN = 24 V
SVeri=es74V
1V2V= 12 V
IN
IN
VIN=24V
VIN = 36 V
VOUT = 5 V, fsw = 400 kHz
V
= 24 V
24V
IN
3V6V= 36 V
IN
0.001
0.01
0.1
1
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
C024
IO - Output Current (A)
C024
IO - Output Current (A)
Figure 48. Efficiency vs Load Current
Figure 49. Light Load Efficiency
100
100
90
80
70
60
50
40
30
20
10
0
95
90
85
80
75
70
65
60
VVIN==66VV
VVIN==66VV
IN
IN
V
= 12 V
V
= 12 V
VIN = 12 V
VIN = 12 V
IN
IN
V
= 24 V
V
= 24 V
VIN = 24 V
VIN = 24 V
IN
IN
VOUT = 3.3 V, fsw = 400 kHz
VOUT = 3.3 V, fsw = 400 kHz
V
= 36 V
V
= 36 V
VIN = 36 V
VIN = 36 V
IN
IN
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0.001
0.01
0.1
1
C050
C051
Load Current (A)
Load Current (A)
Figure 50. Efficiency vs Load Current
Figure 51. Light Load Efficiency
30
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