APX9267X 查看數據表（PDF） - Anpec Electronics

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APX9267X

Single-Phase Full-Wave Motor Driver for Silent Fan Motor

Anpec Electronics 

APX9267

Application Information (Cont.)

PWM input

It is possible to change rotation speed of the motor by

switching high side output transistor. The on-duty of

switching depends on the input signal to PWM terminal.

(See Figure 4. PWM Input Waveform)

IN+

PWM

OUT1

The value of resistor in the range of 1kΩ to 10kΩ is

recommended.

Thermal Consideration

Refer to “Maximum Power Dissipation vs. Ambient

Temperature”, the IC is safe to operate below the curve

and it will cause the thermal protection if the operating

area is above the line. For example, TA= 75°C, the

maximum power dissipation is about 0.35W.

The power dissipation can be calculated by the following

equation:

PD = (VCC - |VOUT1 - VOUT2|) x IOUT + VCC x ICC

For example:

V = 5V, I = 4mA, I = 270mA, V = 4.83V,

CC

CC

OUT

OUT1

V = 0.17V, then P = 0.111W

OUT2

D

The GND pin provides an electrical connection to ground

and channeling heat away. The printed circuit board (PCB)

forms a heat sink and dissipates most of the heat into

ambient air.

OUT2

FG

Figure 4. PWM Input Waveform

The input level of PWM terminal is

H : High side output transistor is ON

L : High side output transistor is OFF

When PWM terminal is open, it is equal to H.

FG Resistor

The value of the FG resistor could be decided by the fol-

lowing equation:

RFG = VCC − VFG

IFG

For example:

VCC=5V, IFG=3mA, VFG=0.2V, RFG=1.6kΩ

Copyright © ANPEC Electronics Corp.

8

Rev. A.6 - Mar., 2008

www.anpec.com.tw

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