APX9268 Datasheet, PDF (8/13 Pages) Anpec Electronics Coropration – Single-Phase Full-Wave Motor Driver for Silent Fan Motor

APX9268
Function Description
Lockup Protection and Automatic Restart
The APX9268 provides the lockup protection and au-
tomatic restart functions for preventing the coil burn-
out in the fan is locked. This IC has an internal counter
to determine the shutdown time (T_OFF) and restart time
(T_ON). During shutdown time, the output drivers keep turn-
ing off for 5 seconds and then enter the restart time. Dur-
ing the restart time, one output is high and the other is
low, which makes a torque for fan rotation. The restart
time has 0.5 second.
If the locked condition is not removed, the shutdown/
restart process will be recurred until the locked condi-
tion is released (See Figure 1 Lockup/Auto Restart
Waveform).
Output Drivers
All four drivers in the bridge output are designed for
single phase full wave motor driver for fan motor.
The linear output architecture is used as output driver.
Frequency Generator Function
The FG pin is an open collector output, connecting a pull
up resistor to a high level voltage for the frequency
generator function.
When IN- is larger than IN+, FG is high (switch off); when
IN- is smaller than IN+, FG is low (switch on). Open the
terminal when not in using.
Thermal Protection
The APX9268 has thermal protection. When internal
junction temperature reaches 175°C, the output devices will
be switched off. When the IC’s junction temperature cools
by 25°C, the thermal sensor will turn the output devices on
again, resulting in a pulsed output during continuous
thermal protection.
IN-
IN+
OUT1
OUT2
T_OFF
T_OFF
T_ON
FG
Lock
Lock
Detection
Release
Reset
Figure 1 Lockup /Auto Restart Waveform
Copyright © ANPEC Electronics Corp.
8
Rev. A.7 - Mar., 2008
www.anpec.com.tw