Texas Instruments TPS54810 - Manual (Page 12)

TPS54810
SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
www.ti.com
12
PERFORMANCE GRAPHS (FROM APPLICATION CIRCUIT SHOWN IN FIGURE 9)
Figure 12
I
O
− Output Current − A
Efficiency
− %
EFFICIENCY
vs
OUTPUT CURRENT
50
55
60
65
70
75
80
85
90
95
100
0 2 4 6 8 10
V
I
= 5 V
V O = 1.8 V
f s = 700 kHz
Figure 13
0.997
0.998
0.999
1
1.001
1.002
1.003
0 2 4 6 8 10
I O − Output Current − A
Load Regulation
LOAD REGULATION
vs
OUTPUT CURRENT
V
I
= 5 V
V O = 1.8 V
T A = 25°C
f s = 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
V I − Input Voltage − V
Line Regulation
LINE REGULATION
vs
INPUT VOLTAGE
V I = 5 V
V O = 1.8 V
T
A
= 25°C
f s = 700 kHz
Figure 15
25
35
45
55
65
75
85
95
105
115
125
0 1 2 3 4
− Ambient
Temperature
−
AMBIENT TEMPERATURE
vs
OUTPUT CURRENT (1)
I O − Output Current − A
C°
T
A
5 6 7 8
V I = 5 V
T J = 25°C
f s = 700 kHz
Figure 16
t − Time − 1 µs/div
Output Ripple V
oltage
− 10 mV/div
OUTPUT RIPPLE VOLTAGE
V
I
= 5 V
V O = 1.8 V
I O = 6 A
f s = 700 kHz
Figure 17
t − Time − 20 µs/div
− Output
Voltage
− 100 mV/div
TRANSIENT RESPONSE
V O
− Output Current
− 2
A/div
I O
V
I
= 5 V
2 A to 6.5 A
Figure 18
4.0 ms/div
Input V
oltage
− 2 V/div
SLOW-START TIMING
V I = 5 V,
0.04 µF
Slow-start Cap
Output
Voltage
− 2 V/div
(1) Safe operating area is applicable to the test board conditions in the Dissipation Ratings