2 Phase Half Wave BLDC Motor Driver
www.fairchildsemi.com
FAN8408D
2 Phase Half Wave BLDC Motor Driver
Features
• • • • • • • A wide range of operation vo...
Description
www.fairchildsemi.com
FAN8408D
2 Phase Half Wave BLDC Motor Driver
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
Ordering Information
Device FAN8408D FAN8408DTF Package 8-SOP-225 8-SOP-225 Operating Temp. −25°C ~ 85°C −25°C ~ 85°C
Rev.1.0.4
©2002 Fairchild Semiconductor Corporation
FAN8408D
Block Diagram
OUTB
1
3
LD
2 Commutation & Control & TSD
HO
OUTA
7
VCC GND
4 5 6 IN+ IN-
8
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 Pin Name OUTB HO LD VCC IN+ IN− OUTA GND I/O O O I I O Pin Function Description Motor output B Hall output Triangle pulse generator for lock detector and automatic restart Supply voltage Hall input + Hall input − Motor output A Ground Remark Open Collector -
2
FAN8408D
Equivalent Circuits
Description OUTB OUTA Pin No. 1 7
1 7 Commutation
Internal Circuit
HO
2
2 Commutation
LD
3
3 Lock detector & Automatic restart
Commutation
VLDCP
VLDCL
IN+ IN-
5 6
5 6 Commutation
3
FAN8408D
Absolute Maximum Ratings (Ta = 25°C)
Parameter Maximum power supply voltage Maximum power dissipationnote1 Thermal resistancenote1 Maximum output voltage Maximum output current...
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