Application Information (Continued)
-30
0
30
60
90
120
150
180
210
240
270
300
330
Elec o
Input / Output
HIN / HO1,2,3
LIN / LO1,2,3
Q5 (HIN3)
Q6 (LIN2)
Q1 (HIN1)
Q2 (LIN3)
Q3 (HIN2)
Q4 (LIN1)
Q5 (HIN3)
Phase Current
I U
I V
I W
Phase Voltage
V S1
Phase Back EMF
V S2
V S3
Current Flow
Direction
U
V
W
U
V
W
U
V
W
U
V
W
U
V
W
U
V
W
Figure 29. 120 ? Commutation Operation Waveforms for 3-Phase BLDC Motor Application
Switching Time Diagram
HIN1,2,3
/LIN1,2,3
50%
50%
HO1,2,3
t ON(H)
t R
90%
t OFF(H) t F
90%
10%
MT1
90%
MT2
90%
10%
LO1,2,3
t ON(L)
10%
t OFF(L)
10%
Figure 30. Switching Time Definition
? 2008 Fairchild Semiconductor Corporation
FAN7888 ? Rev. 1.0.1
12
www.fairchildsemi.com
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