FAN8741 Datasheet, PDF (20/23 Pages) Fairchild Semiconductor – Spindle Motor and 6-CH Driver

Typical Application Circuits(FAN8741G example)
1 DGND
2 VCP
3 CP2
4 CP1
SVCC1(5V)
5 SVCC1
6 FG
7 DIR
R1
8 SPIN
R2
VDD (5V)
R3
9 VDD
10 IN3
11 IN4
12 PGND5
Loading
motor
13 DO4−
14 DO4+
PVCC3(5~12V)
Tilt actuator
15 PVCC3
16 DO3−
17 DO3+
Tracking
actuator
18 DO2−
19 DO2+
Focus
actuator
20 DO1−
21 DO1+
22 PGND4
R4
23 IN1
R5
24 IN2
PVCC1(5~12V)
PVCC2(5~12V)
R6
R7
25 PVCC1
26 PVCC2
27 SLIN1
28 SLIN2
VM1 56
HU+ 55
HU− 54
HV+ 53
HV− 52
HW+ 51
HW− 50
VH 49
VM1
(for spindle,12V)
HALL-U
R_hall1
5V
HALL-V
HALL-W
R_hall2
PGND1 48
U 47
RSP
RSP1 46
V 45
PGND2 44
W 43
RSP2 42
SL1+ 41
3-Phase
BLDC Motor
SL1− 40
SL2+ 39
SL2− 38
PGND3 37
M
Sled(stepping)
Motor
REF 36
MUTE1 35
0.1µF
MUTE2 34
RSL1 ³³
RSL1
RSL2 32
VM2 ³¹
RSL2
VM2
(for sled, 5~12V)
SVCC2 30
SVCC2(5~12V)
SGND 29 ^{(SVCC2!PVCC1,2,3)}
Component
R1~R7
R_hall1,R_hall2
RSL1,RSL2
RSP
Reference value
Remark
10kΩ
Gain scaling resistors. Please refer to 12,13,14 pages.
100Ω
Hall bias resistors
1Ω
Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10kΩ)
0.33Ω
Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10kΩ)
Bypass electrolytic capacitors(47~100µF) are recommended at power supply inputs.
20
FAN8741/FAN8742 Rev. 1.0.1
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