Cirrus Logic AN349 - Manual (Page 6)

AN349
6 AN349REV1
Figure 9 shows the frequency profile across the line voltage for CS1601-based solution.
Figure 9. CS1601 Switching Frequency vs. Line Voltage at Low Line
Figure 10 shows the frequency of operation of the system across load and line condition.
Figure 10. Frequency of Operation Across Line and Load Condition
0
10
20
30
40
50
60
70
80
0 45 90 135 180 225 270 315 360
Phase Angle (degrees)
S
w
it
c
h
in
g
Fr
e
q
u
e
nc
y
(
K
hz
)
DCM
DCM DCM
CRM
DCM
DCM DCM
CRM
M
a
x Fr
e
q
ue
nc
y
(
K
H
z
)
Line Voltage (V)
56
40
70
46
90 147 265
Po > 40%
Po < 20%
181 230