Typical Application Diagram
Figure 1. 3-Phase BLDC Motor Drive Application
Internal Block Diagram
2
HIN1
50K
V B1
28
UVLO
3
4
5
HIN2
HIN3
LIN1
50K
50K
50K
INPUT NOISE
FILTER
[ t FLTIN =250ns ]
UHIN
V DD
ULIN
NOISE
CANCELLER
UVLO
R R
S
DELAY
Q
HO1
V S1
V DD
LO1
27
26
1
16
6
LIN2
50K
SHOOT-THROUGH
PREVENTION
U Phase Driver
COM
13
I SOFT
7
LIN3
50K
DEAD-TIME
[ D T =300ns ]
V DD
VHIN
V Phase Driver
V B2
HO2
V S2
24
23
22
ENABLE INPUT
VLIN
LO2
15
10
EN
FILTER
[ t FLTEN =250ns ]
I SOFT
COM
150K
8
12
FO
Vss
V DD
WHIN
WLIN
W Phase Driver
V B3
HO3
V S3
LO3
20
19
18
14
COM
V DD_UVLO
I SOFT
V REF
Fault
SOFT-OFF
11
RCIN
i RCIN
V RCIN,TH = 3.3V
V RCIN,HYS = 0.7V
Q
R
LATCH
S
CS_COMP
LEB
CS
9
3.3V
? 2011 Fairchild Semiconductor Corporation
FAN73892 ? Rev.1.0.3
Figure 2. Functional Block Diagram
2
0.5V
Protection Circuit
www.fairchildsemi.com
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