fs6989 Fortune Semiconductor Corporation, fs6989 Datasheet - Page 7

• Manufacturer Part Number: fs6989
• Description: Single-phase Full-wave Motor Driver
• Manufacturer: Fortune Semiconductor Corporation

Rev. 0.2
13. Detail Description
Fig4
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Thermal shutdown
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Wide supply voltage range
The FS6989 drives fan motor with wide supply voltage range from 2.8 ~ 6.5V. With low
voltage start-up feature, the design, specifications and performance have been optimized
for 3V and 5V single-phase full-wave brushless DC motor applications.
FG pin open-drained output
The FG pin is an open-drained output and the output frequency is the same with that
sensed by HALL sensor. With suitable output pull up, the fan tachometer output can be
used directly with bipolar or MOS logic for motor speed monitoring/control. This output is
suitable for standard 4 poles fan applications.
Thermal shutdown (TSD)
A thermal shutdown circuit is built in FS6989 with 25 (Typ) hysteresis.
Reverse connection of power supply
There is no requirement of protection diode for power reverse fault in normal applications.
The power polarity protection circuit is built-in.
Power supply line
The connection of the capacitor or Zener Diode between VDD and GND, and a capacitor
between two Hall sensor outputs will increase stability of operation, if required.
TSD ON (Typ: 175 ): Force all output to low and shutdown all blocks.
TSD OFF (Typ: 150 ): Recover to ordinary operation.
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FS6989
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