APX9359A datasheet(7/15 Pages) ANPEC

7 / 15 page

Rev. A.2 - Jan., 2018

www.anpec.com.tw

APX9359A

Function Description

PWM Speed Control (fixed output frequency)

It is possible to change rotation speed of the motor by

switching output transistor. The on-duty of switching de-

pends on the signal from input of PWM terminal. The

output PWM frequency is fixed to 31KHz typically.

Figure 2: Sine Wave Modulation PWM Output

Soft Switch (sine-wave output)

This is a soft switch PWM output to make the phase cur-

rent smoother, which can reduce the noise of motor in

switch interval. Using PWM duty control to simulate the

idea sine wave output current.

Figure 3. Quick Start Waveform

This IC would enter standby mode when the PWM input

keeps low level for more than 10ms (typ.). In standby

mode, the supply current is around 100

µA and the lock

protection function doesn

’t work, therefore, starting fan is

unobstructed when releasing standby mode.

Quick Start and Standby Mode

Sinusoidal PWM

Output

(UO,VO,WO)

Sine Wave

Modulation

(internal signal)

10ms

(typ.)

Disable

Enable

VPWM

Lock Protect

Enable (internal)

VSP Speed Control

The APX9359A also support VSP input voltage speed

control. When the SEL pin pulled down to GND , the VSP

input pin to control the output duty directly.

VCC

50%

25%

75%

100%

0.6V

3.6V

OUT DUTY

VSP

0.2V

Standby

Mode

Figure 1: VSP Control

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