TPS54810
SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
www.ti.com
12
PERFORMANCE GRAPHS (FROM APPLICATION CIRCUIT SHOWN IN FIGURE 9)Fi
g
ure 12
IO − Output Current − A
Efficiency − %
EFFICIENCY
vs
OUTPUT CURRENT
50
55
60
65
70
75
80
85
90
95
100
0246810
VI = 5 V
VO = 1.8 V
fs = 700 kHz
Figure 13
0.997
0.998
0.999
1
1.001
1.002
1.003
0246810
IO − Output Current − A
Load Regulation
LOAD REGULATION
vs
OUTPUT CURRENT
VI = 5 V
VO = 1.8 V
TA = 25°C
fs = 700 kHz
Figure 14
0.999
0.9992
0.9994
0.9996
0.9998
1
1.0002
1.0004
1.0006
1.0008
1.001
4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9
0 A
4 A
8 A
VI − Input Voltage − V
Line Regulation
LINE REGULATION
vs
INPUT VOLTAGE
VI = 5 V
VO = 1.8 V
TA = 25°C
fs = 700 kHz
Figure 15
25
35
45
55
65
75
85
95
105
115
125
01234
− Ambient Temperature −
AMBIENT TEMPERATURE
vs
OUTPUT CURRENT (1)
IO − Output Current − A
C
°
TA
5678
VI = 5 V
TJ = 25°C
fs = 700 kHz
Figure 16
t − Time − 1 µs/div
Output Ripple Voltage − 10 mV/div
OUTPUT RIPPLE VOLTAGE
VI = 5 V
VO = 1.8 V
IO = 6 A
fs = 700 kHz
Fi
g
ure 17
t − Time − 20 µs/div
− Output Voltage − 100 mV/div
TRANSIENT RESPONSE
VO
− Output Current − 2 A/div
IO
VI = 5 V
2 A to 6.5 A
Figure 18
4.0 ms/div
Input Voltage − 2 V/div
SLOW-START TIMING
VI = 5 V,
0.04 µF
Slow-start Cap
Output Voltage − 2 V/div