AN8267S Datasheet, PDF (3/5 Pages) Panasonic Semiconductor – Fan Motor Driver

s Pins Descriptions
Pin No. Symbol
Pin name
1 IN (–) Hall input (–)
2 RD1 Rotation display 1 (pulse output)
3 RD2 Rotation display 2 (H/L output)
4
C Lock protection automatic reset
5 TSD Thermal shutdown
6 OUT1 Motor coil output 1
7
B1 Output base 1
8 P. GND Power ground
Pin No.
9
10
11
12
13
14
15
16
Symbol
B2
OUT2
VM
VCC
GND
VS
NC
IN (+)
Pin name
Output base 2
Motor coil output 2
Counter electromotive absorption
Supply voltage pin
Ground pin
Hall bias
Hall input (+)
s Supplementary Explanation
• Precautions for Using the AN8267S
Observe the following in order to use the AN8267S safely
and properly.
Operating supply voltage range : 9.6V to 27.6V
1. Maximum applied voltage to the coil output Pins6 and 10
When driving the motor, the counter electromotive power
of the coil is applied to the coil output Pins6 and 10 when the
output transistor is turned off. (Refer to Fig.1)
With the AN8267S, see to it that this counter electromotive
power will be 55V or less at maximum.
Hair-shaped Pulse
of Counter Electromotive Power
Motor Generated
Voltage
55Vmax.
Output
OFF
ON
OFF
Transistor
Fig.1 Coil Output Waveform
(Suppressing the Counter Electromotive Power)
To suppress the counter electromotive power by the moter
coil to 55V at maximum, do as follows.
Counterflow Preventive Diode
Zener Diode
Hall Element
14 12 11 ₆
1
AN8267S
16
13 4 8
10
1) When using the Zener diode
Connect the Zener diode between the Pin11 of the
AN8267S and the power line. The counter electromotive
power which can be suppressed by the Zener diode is
VCC –VD +VZ. Since VCCmax.=27.6V;VZmax.= 55V– 27.6V +
0.7V=28.1V
Therefore, if you keep VZ at 28V or less, the counter elec-
tromotive power will not exceed 55V.
2) When using the capacitor
Connect the capacitor between the base and collector of the
coil output transistor as shown in Fig.3.
Counterflow Preventive Diode
Hall Element
14 12 11 ₆
1
AN8267S ⁷
16
9
13
4 8 ¹⁰
Dull a rise
Fig.3
A capacitor value is as follows. C : 1,000pF to 10,000pF
C : 1000pF—10000pF
This capacitor can dull a rise of the counter electromotive
power of the coil output. Select the capacitor so that maxi-
mum voltage of the counter electromotive power Vmax. will
not exceed 55V.
Fig.2