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MBI6650
1.2A DC/DC Converter
October 2007, V1.00
- 7 -
5. Miscellaneous
0
50
100
150
200
250
300
350
400
0
1020
3040
50
60
708090
100
Duty Cycle (%)
fDIM=100Hz
fDIM=300Hz
fDIM=500Hz
fDIM=700Hz
fDIM=1000Hz
0
5
10
15
20
25
30
35
40
01
2
3
4
5
6
7
8
9
10
Duty Cycle (%)
fDIM=100Hz
fDIM=300Hz
fDIM=500Hz
fDIM=700Hz
fDIM=1000Hz
Figure 22. Output current vs. DIM duty cycle @ 1-LED,
Figure 23. Output current vs. DIM duty cycle @ 1-LED,
IOUT=350mA
IOUT=350mA
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
9
12
151821
2427
30
3336
Input Voltage (V)
0.60
0.65
0.70
0.75
0.80
0.85
0.90
9
1215
1821
2427
3033
36
Input Voltage (V)
Figure 24. Rds (on) vs. VIN
Figure 25. Quiescent current vs.
VIN
0.60
0.65
0.70
0.75
0.80
0.85
0.90
9
12
151821
2427
30
3336
Input Voltage (V)
VIN=12V, Iout=350mA
335
340
345
350
355
360
365
-40
-15
10
35
60
85
Temperature (℃)
Figure 26. Shutdown current vs.
VIN
Figure 27. Output current vs. temperature
VIN=12V, Iout=350mA
0.275
0.28
0.285
0.29
0.295
0.3
0.305
0.31
0.315
0.32
0.325
-40
-15
10
35
60
85
Temperature (℃)
Figure 28. VSEN vs. temperature
Figure 29. Start-up waveform @ VOUT=7.2V, IOUT=350mA
Figure 30. Switching waveform @ VOUT=3.6V,
IOUT=350mA
VSW
IOUT
VIN
VSW
VSEN (Attenuation Ratio: 1/20)
IOUT
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