Linear Technology DC1947A Manual page 3

QUICK START PROCEDURE
100
90
80
70
60
50
90 110 130 150 170 190 210 230 250 270
V
Figure 2. Efficiency vs Input Voltage
Input Line Voltage and Current
V AC
IN
200V/DIV
I AC
IN
500mA/DIV
Switch Node Voltage
V
SW
100V/DIV
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(AC-RMS)
IN
DC1947a F02
5ms/DIV
Figure 5. V = 120VAC
IN
5μs/DIV
Figure 7. V = 120VAC
IN
DEMO MANUAL DC1947A
1.4
1.2
1.0
0.8
0.6
90 110 130 150 170 190 210 230 250 270
V (AC-RMS)
IN
Figure 3. I vs Input Voltage
OUT
V AC
IN
200V/DIV
I AC
IN
500mA/DIV
DC1947a F05
V
SW
100V/DIV
DC1947a F07
1.00
0.98
0.96
0.94
0.92
0.90
90 110 130 150 170 190 210 230 250 270
V
DC1947a F03
Figure 4. Power Factor vs Input Voltage
5ms/DIV
Figure 6. V = 230VAC
IN
5μs/DIV
Figure 8. V = 230VAC
IN
(AC-RMS)
IN
DC1947a F04
DC1947a F06
DC1947a F08
dc1947af
3