FAN8741 Fairchild Semiconductor, FAN8741 Datasheet - Page 19

• Manufacturer Part Number: FAN8741
• Manufacturer: Fairchild Semiconductor

FAN8741/FAN8742 Rev. 1.0.1
Typical Application Circuits(FAN8741MTF example)
R_hall1,R_hall2
Component
RSL1,RSL2
R1~R7
RSP
Bypass electrolytic capacitors(47~100 F) are recommended at power supply inputs.
Reference value
5V
Sled(stepping)
BLDC Motor
R_hall1
0.33
10k
100
Motor
3-Phase
0.1 F
1
(for sled, 5~12V)
(SVCC2! ! ! ! PVCC1,2,3)
(for spindle,12V)
VM2
SVCC2(5~12V)
VM1
HALL-W
HALL-U
HALL-V
R_hall2
M
RSL2
RSP
RSL1
15
10
12
16
17
22
25
26
27
28
7
11
13
14
18
19
20
21
23
24
2
4
8
1
3
5
6
9
VM1
HU+
HU
HV+
HV
HW+
HW
VH
PGND1
U
RSP1
V
PGND2
W
RSP2
SL1+
SL1
SL2+
SL2
PGND3
REF
MUTE1
MUTE2
RSL1
RSL2
VM2
SVCC2
SGND
Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10k
Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10k
Gain scaling resistors. Please refer to pages 12,13, and 14.
19
PGND5
PGND4
SVCC1
PVCC3
PVCC1
PVCC2
DGND
SLIN1
SLIN2
DO4
DO4+
DO3
DO3+
DO2
DO2+
DO1
DO1+
SPIN
VDD
VCP
CP2
CP1
DIR
IN3
IN4
IN1
IN2
FG
56
55
53
52
51
50
49
48
45
42
41
29
54
47
40
36
35
32
31
30
46
44
43
39
38
37
34
33
Hall bias resistors
PVCC1(5~12V)
PVCC2(5~12V)
PVCC3(5~12V)
SVCC1(5V)
Remark
VDD (5V)
actuator
Tilt actuator
Tracking
actuator
Loading
Focus
motor
R7
R6
R5
R4
R3
R2
R1
www.fairchildsemi.com