APX9266 데이터 시트보기 (PDF) - Anpec Electronics

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APX9266

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

Anpec Electronics 

APX9266

Function Description

Lockup Protection and Automatic Restart

The APX9266 provides the lockup protection and auto-

matic restart functions for preventing the coil burnout

in the locked fan. Connecting the capacitor from CT pin to

GND determines the shutdown time and restart time.

As the fan is locked the charge/discharge circuit, charging

the CT capacitor to 1.3V by a 0.95µA source current for a

locked detection time and then switches the capacitor

to discharge. During this discharge interval, the out-

put drivers are switched off until the CT voltage is dis-

charged to 0.325V by a 0.16µA sink current and

switches the capacitor to charge. During this charging

interval, the IC enters the restart time; one output is high

and another is low, which makes a torque for fan rotation

until the CT voltage is charged to 1.3V by a 0.95µA source

current. If the locked condition is not removed, the charge/

discharge process will be recurred until the locked con-

dition is released (See Figure 1. Lockup Protection and

Automatic Restart Waveform).

Lock protect function does not work if PWM input frequency

is slower than 15Hz (typ.). Therefore, the PWM input

frequency must be more than 20Hz.

PWM

Lock protect

enable (internal)

66.5ms

(typ.)

enable

disable

enable

CT

HB

OUT1

HB recovery time (typ.=5us)

IN-

IN+

OUT1

OUT2

TOFF

TOFF

TON

CT

FG

HB

Lock Lock

Detection

Release

Figure 1. Lockup Protection and Automatic Restart Waveform

Quick Start

This IC disables the lock protection function when the

PWM input keeps low level for more than 66.5ms (typ.)

(see Figure 2. Quick Start Waveform).

Figure 2. Quick Start Waveform

Frequency Generator Function

The FG pin is an open collector output, connecting a pull up

resistor to a high level voltage for the frequency generator

function.

During the Lock Mode, the FG will be always high (switch

off). (See Truth Table) Open the terminal is at no use.

Thermal Protection

The APX9266 has thermal protection. W hen internal

junction temperature reaches 170°C, the output devices

will be switched off. When the IC’s junction temperature

cools by 35°C, the thermal sensor will turn the output

devices on again, resulting in a pulsed output during

continuous thermal protection.

Copyright © ANPEC Electronics Corp.

8

Rev. A.4 - Mar., 2008

www.anpec.com.tw

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