FD177

Version

：A.003

Page

：5

點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC.

FD177

Application Notes

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.

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:

0

100

200

300

400

500

600

0

25

50

75

100

125

150

TSOT-28

Ambient Temperature ( C )