Fairchild Semiconductor FAN8408D Datasheet
FAN8408D
2 Phase Half Wave BLDC Motor Driver
www.fairchildsemi.com
Features
• A wide range of operation voltage: 4V to 15V
• Built-in motor lock detector.
• Automatic restart function
• Hall output for a motor speed detection
• Built-in thermal shut down circuits
• Built-in reverse current protection diode
• Compact package: 8-SOP-225
Description
The FAN8408D is a monolithic integrated circuit, and
suitable for DC cooling fan motors.
8-SOP-225
1
Typical Applications
• DC cooling fan motor
©2002 Fairchild Semiconductor Corporation
Ordering Information
Device Package Operating Temp.
FAN8408D 8-SOP-225 −25°C ~ 85°C
FAN8408DTF 8-SOP-225 −25°C ~ 85°C
Rev.1.0.4
FAN8408D
Block Diagram
OUT
OUT
LD
1
B
3
HO
2
Commutation &
Control
7
A
& TSD
V
GND
CC
4
IN+
8
5
IN-
6
Pin Definitions
Pin Number Pin Name I/O Pin Function Description Remark
1OUT
B
2 HO O Hall output Open Collector
3LD4V
CC
5IN+ I Hall input + -
6IN− I Hall input − -
7OUT
A
8 GND - Ground -
O Motor output B -
Triangle pulse generator for lock detector
and automatic restart
- Supply voltage -
O Motor output A -
-
2
Equivalent Circuits
Description Pin No. Internal Circuit
OUT
B
1
FAN8408D
OUT
A
HO
LD 3
7
1
7
Commutation
2
2
Commutation
3
Lock detector
& Automatic
restart
Commutation
IN+ 5
IN- 6
V
LDCP
V
LDCL
5
6
Commutation
3
FAN8408D
Absolute Maximum Ratings (Ta = 25°C)
Parameter Symbol Value Unit
Maximum power supply voltage V
Maximum power dissipation
Thermal resistance
note1
note1
Maximum output voltage V
Maximum output current I
Hall output current I
Hall output withstanding voltage V
Maximum hall input ac level V
Operating temperature T
Storage temperature T
Note1:
PCB Condition: Thickness(1.6mm), Dimension(76.2mm * 114.3mm)
Refer: EIA/J SED 51-3 & EIA/J SED 51-7
Note2: Air condition (0m/s)
Note3: Air condition (3m/s)
Note4: Should not exceed P
or ASO value
D
CCMAX
P
DMAX
Θ
JA
OMAX
OMAX
HO
HO
HACMAX
OPR
STG
18 V
note2
429
620
291.61
201.52
note3
note2
note3
mW
°C/W
30 V
note4
1.2
A
10 mA
36 V
6V
−25 ~ 85 °C
−55 ~ 150 °C
Power Dissipation Curve (Air condition = 0m/s)
0.5
0.45
0.4
0.35
0.3
0.25
Pd[W]
0.2
0.15
0.1
0.05
0
0 20 40 60 80 100 120 140 160
Tc or Ta[°C]
4
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