Analog Devices UG-197, User Manual

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Evaluation Board User Guide UG-197
Rev. 0 | Page 5 of 16
0
10
20
30
40
50
60
70
80
E
FFIC
IE
N
C
Y
(
%)
LOAD CURRENT (mA)
1MHz
700kHz
500kHz
200kHz
0 50 100 150 200 250 300 350 400 500 450
09417-
005
Figure 5. 5 V In to 5 V Out Efficiency with the Coilcraft Transformer at Various
Switching Frequencies
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 400 500 450
E
FFIC
IE
N
C
Y
(
%)
LOAD CURRENT (mA)
–40°C
+25°C
+105°C
09417-
006
Figure 6. 5 V In to 5 V Out Efficiency with the Coilcraft Transformer at 500 kHz
over Temperature
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 400 500 450
E
FFIC
IE
N
C
Y
(
%)
LOAD CURRENT (mA)
1MHz
700kHz
500kHz
200kHz
09417-
007
Figure 7. 5 V In to 5 V Out Efficiency with the Halo Transformer at Various
Switching Frequencies
0
10
20
30
40
50
60
70
80
0 50 100 150 200 250 300 350 450 400 500
E
FFIC
IE
N
C
Y
(
%)
LOAD CURRENT (mA)
09417-
008
5V IN TO 5V OUT
5V IN TO 3.3V OUT
3.3V IN TO 3.3V OUT
Figure 8. Single Supply Efficiency for Various Output Configurations with the
Coilcraft Transformer at 500 kHz