Copyright

© ANPEC Electronics Corp.

Rev. A.1 - Feb., 2016

www.anpec.com.tw

13

APX9322

Function Descriptions (Cont.)

Sine Wave Modulation

Figure

7: Sine Wave Modulation PWM Output

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.

Sinusoidal PWM Output

(U,V,W)

Sine Wave

Modulation

(internal signal)

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

’s junction tempera-

continuous thermal overload.