APX9268 datasheet(8/13 Pages) ANPEC

8 / 13 page

Rev. A.7 - Mar., 2008

www.anpec.com.tw

APX9268

Function Description

Figure 1 Lockup /Auto Restart Waveform

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

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.

Lock

OUT1

Release

OFF

OUT2

IN+

IN-

Lock

Detection

Reset

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