Copyright

© ANPEC Electronics Corp.

Rev. A.1 - Feb., 2016

www.anpec.com.tw

14

APX9322

Application Information

Input Protection Diode & Capacitor

The IC should be added a protection diode (D1) to prevent the damage from the power reverse connection.

However, the protection diode will cause a voltage drop on the supply voltage. The current rating of the diode must be

greater than the maximum output current. For the noise reduction purpose, a capacitor (C1) must connect between

VCC and GND. It is the suggestion that C1 should be placed as close as possible to the device VCC pin.

SC Capacitor

The SC pin capacitor is used to set the force start up timing (T

set the start up timing for different motor or loading of fan motor. T

SC

would increase in proportion to the capacitor.

:

C

C

:

:

C

>>>> T

:

EX:

SS Capacitor

The SS capacitor is used to set the output duty change rate for soft start. The time (T

duty from 0% to 100%. T

SS

would increase in proportion to the capacitor.

:

C

C

:

:

C

>>>> T

:

EX:

CT Capacitor

The capacitor that is connected from CT pin to GND determines the shutdown time and restart time.

Locked Detection Time =

Restart Time=

Shutdown Time=

(

)

I

V

C

CT1

CTH

CT

0.2V

−

×

(

)

I

V

V

C

CT1

CTL

CTH

CT

−

×

(

)

I

V

V

C

CT2

CTL

CTH

CT

−

×