TPS54531
SLVSBI5 –MAY 2013
www.ti.com
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 12 V
VIN = 12 V
VIN = 24 V
VIN = 24 V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0.001
0.01
0.1
1
10
C007
C008
Output Current - A
Output Current - A
Figure 13. TPS54531D Efficiency
Figure 14. TPS54531D Low Current Efficiency
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0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
0.1
0.08
0.06
VIN = 12 V
0.04
0.02
0
IOUT = 2.5 A
-0.02
-0.04
-0.06
-0.08
-0.1
VIN = 24 V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
8
10
12
14
16
18
20
22
24
26
28
C009
C010
Output Current - A
Input Voltage - V
Figure 15. TPS54531D Load Regulation
Figure 16. TPS54531D Line Regulation
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60
180
120
60
40
20
V
= 200 mV/div (ac coupled)
OUT
Phase
0
0
I
= 1 A/div
OUT
-20
-40
-60
-60
Gain
-120
1.25 A to 3.75 A load step,
slew rate = 500 mA / µsec
-180
10
100
1000
10000
100000
1000000
C011
Frequency - Hz
Time = 200 µs/div
Figure 17. TPS54531 Transient Response
Figure 18. TPS54531 Loop Response
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18
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