點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
FD177
Application Notes
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The device is operated within wide supply voltage range from 2.0 to 6.5
Volts. The design, specifications and performance have been optimized
for 5V brushless DC motor applications.
The output driver node O1/O2 will be “turned to drive/sink” when V(HP) >
V(HN). Similarly, the output O1/O2 will be “turned to sink/drive” when
V(HP) < V(HN).
There is no need of external timing capacitor for lock protection and
auto-restart function. For 5V application, the drivers will be shut down
roughly 1 second after the motor is locked. When the drivers have been
shut down, the automatic self-restart circuit will try to power up the drivers
every 1 second until lock is released.
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There is no requirement of protection diode for power reverse fault in
normal applications. The power polarity reverse protection circuit is
built-in.
The connection of the capacitor 1uF between VDD and GND and the
capacitor 0.1uF between Hall sensor HP and HN will increase the
system stability when motor is rotating.
The power dissipated by the IC varies widely with the supply voltage, the
output current, and loading. It is important to ensure the application does
not exceed the allowable power dissipation of the IC package. The
recommended motor driver power dissipation versus temperature is
depicted as follows:
600
500
400
300
200
100
0
TSOT-28
0
25
50
75
100
125
150
Ambient Temperature ( C )
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FD177
Version：A.003
Page：5
SITI [ SILICON TOUCH TECHNOLOGY INC. ]
