K Series with PFC Data Sheet
150 – 280 Watt AC-DC Converters
Switching Frequency
Efficiency
05008b
0.9
LK4501-eta
V i = 230 V
0.8
V i = 85 V
0.7
0.6
0.5
0
0.2
0.4
0.6
0.8
I o /I o nom
Fig. 9
Typical switching frequency of the DC/DC converter
versus load (The boost converter at the input stage
operates with a constant switching frequency of 100
kHz.)
Fig. 11a
Efficiency versus output current (LK4501-7R)
Hold-up Time
0.9
V i = 230 V
LKP5660-eta
ms
LK4501-hu-a
0.8
V i = 187 V
160
120
V i = 230 V
0.7
80
0.6
0
0.2
0.4
0.6
0.8
I o /I o nom
40
V i = 85 V
0
0
0.2
0.4
0.6
0.8
I o / I o nom
Fig. 11b
Efficiency versus output current (LKP5660-7R)
Fig. 10a
Hold-up time versus output power (LK4501-7R), valid for
converters with version V102 or higher.
ms
160
120
80
40
V i = 187 V
V i = 230 V
LKP5660-hu-a
0
0
0.2
0.4
0.6
0.8
1
I o / I o nom
Fig. 10b
Hold-up time versus output power (LKP5660-7R)
BCD20001-G Rev AC, 16-Dec-2010
Page 7 of 29
www.power-one.com
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