APX9322 Datasheet, PDF (14/20 Pages) Anpec Electronics Coropration – Three-Phase Full-wave Sine-wave Brushless Motor Driver

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 ) for sine-wave start up. Adjust the SC capacitor can
SC
set the start up timing for different motor or loading of fan motor. T_SC would increase in proportion to the capacitor.
EX:
:
C_SC =1.0nF >>>> T_SC =124ms
C =2.2nF >>>> T =272ms
SC
SC
:
:
C_SC =5nF >>>> T_SC =620ms
:
SS Capacitor
The SS capacitor is used to set the output duty change rate for soft start. The time (T_SS) is define the time of output
duty from 0% to 100%. T_SS would increase in proportion to the capacitor.
EX:
:
C_SS =1.0nF >>>> T_SS =3.72s
C =2.2nF >>>> T =8.18s
SS
SS
:
:
C_SS =5nF >>>> T_SC =18.6s
:
CT Capacitor
The capacitor that is connected from CT pin to GND determines the shutdown time and restart time.
Locked
Detection
Time
=
( ) _{C V} ×
− 0.2V
CT
CTH
ICT1
( ) _Restart
Time=
CCT ^×
V V ^− CTH
CTL
ICT1
Shutdown
Time=
C (V V ) ×
CT
− _CTH
CTL
ICT2
Copyright © ANPEC Electronics Corp.
14
Rev. A.1 - Feb., 2016
www.anpec.com.tw