Fairchild Semiconductor FAN8420D3 Datasheet
FAN8420D3
3-Phase BLDC Motor Driver
www.fairchildsemi.com
Features
• 3-phase, full-wave, linear BLDC motor driver
• Power save at stop mode
• Built-in current limiter
• Built-in TSD (Thermal shutdown) circuit
• Built-in 3X and 1X hall FG output
• Built-in hall bias circuit
• Built-in rotational direction detector
• Built-in reverse rotation preventer
• Built-in short braker
• Corresponds to 3.3V DSP
Description
The FAN8420D3 is a monolithic IC, suitable for a 3-phase
spindle motor driver of a CD-media system.
28-SSOPH-37528-SSOPH-375SG2
Typical Applications
• Compact disk ROM (CD-ROM) spindle motor
• Compact disk RW (CD-RW) spindle motor
• Digital video disk ROM (DVD-ROM) spindle motor
• Digital video disk RAM (DVD-RAM) spindle motor
• Digital video disk Player (DVDP) spindle motor
• Other compact disk media spindle motor
• Other 3-phase BLDC motor
©2000 Fairchild Semiconductor International
Ordering Information
Device Package Operating Temp.
FAN8420D3
FAN8420D3TF 28-SSOPH-375SG2
28-SSOPH-375SG2
−25°C ~ +75°C
−25°C ~ +75°C
Rev. 1.0.1
Oct. 2000.
FAN8420D3
Pin Assignments
CS1
VM
NC
VCC
FG1X
S/S
EC
FIN(GND)
ECR
DIR
FG3X
SB
FAN8420D3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
NC
A3
NC
A2
NC
NC
A1
FIN(GND)
GND
−
H1
H1+
H2+
Pin Definitions
Pin Number Pin Name I/O Pin Function Description
1 NC - No connection
2 A3 O Output (A3)
3 NC - No connection
4 A2 O Output (A2)
5 NC - No connection
6 NC - No connection
7 A1 O Output (A1)
8 GND - Ground
9 H1+ I Hall signal (H1+)
10 H1− I Hall signal (H1−)
11 H2+ I Hall signal (H2+)
12 H2− I Hall signal (H2−)
13 H3+ I Hall signal (H3+)
14 H3− I Hall signal (H3−)
15 VH I Hall bias
16 NC - No connection
17 PC1 - Phase compensation capacitor
18 SB I Short brake
19 FG3X O FG waveform (3X)
20 DIR O Rotational direction output
21 ECR I Output current control reference
22 EC I Output current control voltage
PC1
−
H2
H3+
NC
VH
1516171819202122232425262728
−
H3
2
Rev. 1.0.1
Oct.. 2000.
Pin Definitions (Continued)
Pin Number Pin Name I/O Pin Function Description
23 S/S I Power save (Start/Stop switch)
24 FG1X O FG waveform (1X)
25 VCC - Supply voltage (Signal)
26 NC - No connection
27 VM - Supply voltage (Motor)
28 CS1 - Output current detection
Internal Block Diagram
FAN8420D3
EC
S/S
FG1X
VCC
NC
VM
CS1
FG1X
1 2 3 4 5 6 7 8 91011121314
NC
A3
NC
A2
NC
Stop
Start
Generator
Current sense
Amp
A1
NC
GND
−
+
Output
Current limit
GND
Absolute
Values
Upper
Distributor
Lower
Distributor
ECR
GND
DIR
Logic
Reverse rotation
Selector
Commutation
H1+
FG3X
FG3X
Generator
H1−
SB
PC1
Brake
Short
Detector
Detection
Hall amp
H2−
H2+
NC
TSD
H3+
VH
1516171819202122232425262728
Hall
H3−
Rev. 1.0.1
Oct. 2000.
3
FAN8420D3
Equivalent Circuits
Hall input Driver output
28
9
50Ω
11
13
1kΩ
1kΩ
50Ω
10
12
14
2274 7
Torque control input Hall bias input
50Ω
21
50Ω
22
+
−
15
100kΩ
Start / Stop input Short brake input
23
10kΩ
50Ω
40kΩ
30kΩ
50Ω
18
FG output Dir output
V
CC
50Ω
19
24
30kΩ
V
CC
1kΩ
20kΩ
50Ω
20
4
Rev. 1.0.1
Oct.. 2000.
Absolute Maximum Ratings (Ta = 25°°°°C)
Parameter Symbol Value Unit
Maximum supply voltage (Signal) V
Maximum supply voltage (Motor) V
Power dissipation P
Maximum output current I
Operating temperature range T
Storage temperature range T
NOTE:
1. When mounted on a 76 .2mm × 114mm × 1.57mm PCB (Phenolic resin material).
2. Power dissipation reduces 16.6mW/°°°°C for using above Ta = 25°°°°C
3. Do not exceed P
and SOA (Safe operating area).
D
CCmax
Mmax
D
Omax
OPR
STG
7V
15 V
note
2.5
1.3 A
−25 ~ +75 °C
−55 ~ +150 °C
Power Dissipation Curve
Pd (mW)
3,000
2,000
FAN8420D3
W
1,000
SOA
0
0 25 50 75 100 125 150 175
Recommended Operating Conditions (Ta = 25°°°°C)
Parameter Symbol Min. Typ. Max. Unit
Supply voltage V
Motor supply voltage V
CC
M
4.555.5 V
3.0 12 14 V
Ambient temperature, Ta [°C]
Rev. 1.0.1
Oct. 2000.
5
FAN8420D3
Electrical Characteristics
(Unless otherwise specified, Ta=25°C, VCC=5V, VM=12V)
Parameter Symbol Conditions Min. Typ. Max. Unit
Quiescent circuit current 1 I
Quiescent circuit current 2 I
CC1
CC2
START / STOP
On voltage range V
Off voltage range V
SSon
SSoff
HALL BIAS
Hall bias voltage V
HB
HALL AMP
Hall bias current I
Common-mode input range V
Minimum input level V
H1 hysteresis level V
HA
HAR
INH
HYS
TORQUE CONTROL
Ecr Input voltage range E
Ec Input voltage range E
Offset voltage (−)E
Offset voltage (+) E
Ec Input current E
Ecr Input current E
Input / output gain G
CR
C
Coff
Coff+
Cin
CRin
EC
−
FG
FG output voltage (H) V
FG output voltage (L) V
FGh
FGl
Duty (reference value) - - 50 - %
OUTPUT BLOCK
Saturation voltage (upper TR) V
Saturation voltage (lower TR) V
Torque limit current I
OH
OL
TL
DIRECTION DETECTOR
Dir output voltage (H) V
Dir output voltage (L) V
DIRh
DIRl
SHORT BRAKE
On voltage range V
Off voltage range V
SBon
SBoff
At stop mode - - 0.2 mA
At start mode - 5 10 mA
Output driver on 2.5 - V
CC
Output driver off 0.0 - 1.0 V
IHB=20mA 0.4 1.0 1.8 V
--0.52µA
- 1.0 - 4.0 V
-60--mVpp
- 5 20 40 mVpp
-0.2− 3.3 V
-0.2− 3.3 V
EC=1.9V −80 −50 −20 mV
EC=1.9V 205080mV
EC=1.9V -5 -0.5 −µA
ECR=1.9V -5 -0.5 −µA
EC=1.9V, RCS=0.5Ω 0.56 0.71 0.84 A/V
Ifg=-10µA4.54.9-V
Ifg=10µA--0.5V
IO=−300mA - 0.9 1.4 V
IO=300mA - 0.4 0.7 V
RCS=0.5Ω 560 700 840 mA
Ifg=-10µA4.54.7-V
Ifg=10µA--0.5V
-2.5-V
CC
-0-1.0V
V
V
6
Rev. 1.0.1
Oct.. 2000.
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