APX9267 Datasheet, PDF (7/12 Pages) Anpec Electronics Coropration – Single-Phase Full-Wave Motor Driver for Silent Fan Motor

APX9267
Function Description (Cont.)
Frequency Generator Function (Cont.)
erator function. During the Lock Mode, the FG will be
always high (switch off) (See Truth Table). Open the ter-
minal when not in using.
Thermal Protection
The APX9267 has thermal protection, when 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.
Truth Table
Input
Output
IN-
IN+
PWM
OUT1
OUT2
FG
L
H
H
L
L
H
H
L
L
H
OFF
H
L
L
L
OFF
L
L
H
L
L
L
L
H
L
L
OFF
-
H
L
L
L
OFF
-
-
L
OFF
OFF
OFF
Mode
Operation Mode
Lock Mode
Standby Mode
Application Information
Input Protection Diode & Capacitor
The APX9267 should be added a protection diode (D1) to
protect the damage from the power reverse connection.
However, the protection diode will cause a voltage drop
on the supply voltage. The current rating of the diode
must be greater than the maximum output current. For
the noise reduction purpose, a capacitor (C1) 1µF is con-
nected between VCC and GND (See Typical Application
Circuit).
Hall input
(IN+)-(IN-)
OUT1
Please adjust hall input voltage by value of resistance so
that hall signal contains amplitude input within range
GND~V_CC -1.1.
The output signal of this IC is the amplified hall input
signal, therefore, the output signal depends on hall input.
When the hall input is small, the output signal becomes
gentle. Oppositely, when the input signal is large, the
output becomes steep (See Figure 3. Differences of
output signal depending on the shape of hall input
signal) .The input/output gain is 48dB (typ.). Thus, please
adjust the amplitude of hall input to meet the adequate
output voltage.
(IN+)-(IN-)
OUT1
Figure 3. Differences of Output Signal Depending on the
Shape of Hall Input Signal
Copyright © ANPEC Electronics Corp.
7
Rev. A.6 - Mar., 2008
www.anpec.com.tw