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| APX9267 Datasheet, PDF (6/12 Pages) Anpec Electronics Coropration – Single-Phase Full-Wave Motor Driver for Silent Fan Motor | |||
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APX9267
Typical Application Circuit
1 OUT2
Zener
D1 D2
VIN
2 VCC
C1
6V
3 IN+
GND 8
OUT1 7
PWM 6
PWM
control signal
4 IN-
FG 5
10kâ¦
RFG
Pull High
Voltage
FG Output
Note 2: In hot plug application, itâs necessary to protect against a hot plug input voltage overshoot. Add an input zener diode, between
the VCC and GND, to clamp the overshoot. In normal operation diode, the zener diode isnât stressed because output current
doesnât reverse to VCC.
Function Description
Lockup Protection and Automatic Restart
This IC detects the rotation of the motor by hall signal,
and adjusts lock detection ON time (TON) and lock detec-
tion OFF time (TOFF) by internal counter. These times
(TON, TOFF) are showed below.
IN+
IN-
Quick Start and Standby mode
This IC would enter standby mode when the PWM input
keeps low level for more than 66.5ms (typ.). In standby
mode, it will shutdown amplifier and FG. Thus, the supply
current is around 150µA. In standby mode, the lock pro-
tection function doesnât work, therefore, starting fan is
unobstructed when releasing standby mode.
OUT2
OUT1
TOFF
TOFF
TON
PWM
Lock
protect
enable (internal)
66.5ms
(typ.)
enable
disable
enable
FG
Lock Lock
Detection
Release Reset
Figure 1. Lock Protection and Automatic Protection Wave-
form
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 gen-
Copyright © ANPEC Electronics Corp.
6
Rev. A.6 - Mar., 2008
www.anpec.com.tw
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