APX9322 Datasheet, PDF (13/20 Pages) Anpec Electronics Coropration – Three-Phase Full-wave Sine-wave Brushless Motor Driver

APX9322
Function Descriptions (Cont.)
Sine Wave Modulation
This is a soft switch PWM output to make the phase current smoother, which can reduce the noise of motor in switch
interval. Using PWM duty control to simulate the idea sine wave output current.
Sine Wave
Modulation
(internal signal)
Sinusoidal PWM Output
(U,V,W)
Figure 7: Sine Wave Modulation PWM Output
Lock Protection and Auto Restart
The APX9322 provides the lockup protection and automatic restart functions for preventing the coil burnout while the
fan motor is locked. Connecting the capacitor from CT pin to SGND can determine the shut down time and restart
time.
Current Limit and Over Current Protection (OCP)
The APX9322 includes an internal current sense circuits for current limit and over-current protection (OCP). When the
total current of three phase over the current limit level, the high side driver will be turned off to stop supplying current
to the motor. If the total output current over the OCP current level, the OCP function will be enable to turn-off all of the
output driver to prevent output short through condition until pull low PWM pin or re-power on.
Thermal Protection
The APX9322 is designed with a thermal protection to protect the IC from the damage of over temperature. When
internal junction temperature reaches 165^oC, the output devices will be switched off. When the IC’s junction tempera-
ture cools by 30^oC, the thermal sensor will turn the output devices on again resulting in a pulsed output during
continuous thermal overload.
Copyright © ANPEC Electronics Corp.
13
Rev. A.1 - Feb., 2016
www.anpec.com.tw