APX9268 Datasheet, PDF (9/13 Pages) Anpec Electronics Coropration – Single-Phase Full-Wave Motor Driver for Silent Fan Motor

APX9268
Application Information
Input Protection Diode & Zener Diode & Capacitor
It 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
larger than the maximum output current. Connecting
VCC and GND with a Zener diode (D2) can avoid exceed-
ing the absolute maximum rating voltage. For the noise
reduction purpose, there is a capacitor (C1) 1µF
(recommended) connecting VCC and GND (See Typical
Application Circuit).
Hall input
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, the input signal is large, the output
becomes steep (See Figure 2 Different of output sig-
nal 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
(IN+)-(IN-)
FG Resistor
The value of the FG resistor could be decided by the fol-
lowing equation:
RFG = ^{VCC − VFG}
IFG
For example:
V_CC = 5V, I_FG = 3mA, V_FG = 0.2V, R_FG = 1.6KΩ
The value of resistor in the range of 1kΩ to 10kΩ is
recommended.
Thermal Consideration
The IC is safe to operate below the line and it will cause
the thermal protection if the operating area is above the
line.
For
example,
T=
A
75°C,
the
maximum
power
dis-
sipation is about 0.35W (See Power Dissipation
vs. Ambient Temperature). Mounted on a board, there is
60x38x1.6t mm, Glass epoxy. The power dissipation can
be calculated by the following equation:
P_D = (V_CC - V_OH + V_OL) x I_OUT + V_CC x I_CC
For example:
If
V = 5V, I = 4mA, I = 270mA, V = 4.83V,
CC
CC
OUT
OH
V_OL = 0.17V,
then
P = 0.111W
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.
OUT1
Figure 2 Different of output signal depending on the
shape
Copyright © ANPEC Electronics Corp.
9
Rev. A.7 - Mar., 2008
www.anpec.com.tw