Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control( 2.0 to 6.5 Volts )

Version

：A.005

Page

：6

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FD178/FD178B/FD178C

Thermal Shutdown

The FD178 provides a temperature error detection circuit, once the temperature

all the outputs.

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).

The output frequency on FGR pin is the same frequency with hall switching for FD178,

dividing the hall switching frequency with 2 for FD178B, and the rotating detection for

FD178C.

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.

Shutdown

Normal

℃

122℃

+10℃

(3

σ)

-10℃

(3

σ)