2
AN1459.0
June 9, 2009
Output Voltage Ripple
Figure 3 shows the ripple voltage on the output of the
regulator at 5A load current.
Transient Responses
Figures 4, 5, and 6 show the response of the output when
subjected to transient loading from 1A to 5A at 1A/µs (within
continuous conduction mode).
Figure 7 shows the response of the output when subjected
to transient loading from 0.1A to 5A at 1A/µs (transition
between continuous conduction mode and discontinuous
conduction mode).
Efficiency and Line Regulation
The efficiency and the line regulation of the evaluation board
with various input voltages are shown in Figures 8 and 9,
respectively.
FIGURE 3. OUTPUT VOLTAGE RIPPLE @ I
OUT
= 5A
V
OUT
FIGURE 4. OUTPUT TRANSIENT
V
OUT
FIGURE 5. OUTPUT TRANSIENT
V
OUT
PHASE
FIGURE 6. OUTPUT TRANSIENT
V
OUT
PHASE
FIGURE 7. OUTPUT TRANSIENT
V
OUT
FIGURE 8. CONVERTER EFFICIENCY (V
OUT
= 12V)
70
75
80
85
90
95
100
0
1
2
3
4
5
6
LOAD CURRENT (A)
E
F
F
IECIENCY (%
)
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
V
IN
= 60V
Application Note 1459
