TA8462F/FG
TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT
SILICON MONOLITHIC
TA8462F/FG
FAN MOTOR DRIVER IC
The TA8462F/FG is a 2 phase half−wave hall motor driver IC.
This IC is best suited for the fan motor driving.
The output current of this IC is 1.5 A (peak) and all functions
needed for fan motor driving have been incorporated into a 1 chip,
enabling it to largely reduce peripheral parts and a space, thus
realizing down−sizing.
Further, the TA8462F/FG is provided with the FG output pin
(outputs pulses proportional to the motor speed) and the RD
output pin (outputs the motor ON / OFF statues).
FEATURES
Built−in Automatic Self Rotation Recovery Circuit After
Release of Motor Locking.
Thermal Shutdown Circuit Incorporated.
Operating Voltage: 4~15 V
Recommended Operating Voltage: V
CC
= 5 V, 12 V
No V
CC
−GND
Reverse Connection Preventive Diode Required.
Weight : 0.09 g (Typ.)
The TA8462FG:
The TA8462FG is a Pb-free product.
The following conditions apply to solderability:
*Solderability
1. Use of Sn-37Pb solder bath
*solder bath temperature = 230°C
*dipping time = 5 seconds
*number of times = once
*use of R-type flux
2. Use of Sn-3.0Ag-0.5Cu solder bath
*solder bath temperature = 245°C
*dipping time = 5 seconds
*the number of times = once
*use of R-type flux
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2006-3-2
TA8462F/FG
BLOCK DIAGRAM
2
2006-3-2
TA8462F/FG
PIN FUNCTION
PIN No.
1
2
3
4
5
6
7
8
9
10
SYMBOL
NC
OUT A
GND
OUT B
FG
RD
V
CC
IN A
IN B
C
SC
FUNCTIONAL DESCRIPTION
Non connection
Output terminal
GND terminal
Output terminal
Rotation speed output terminal
Rotation detect output terminal
Power voltage supply terminal
Hall input terminal
Hall input terminal
Lock protector time constant determined terminal
FG and RD outputs
Both the FG and RD outputs are the open collector outputs.
The FG output is pulse proportional to the number of revolutions (the cycle is the same as OUT B) and the RD
output is at the GND level (actually, at V
sat (RD)
level) when the motor is being driven and the RD output at the
potential level that is to be applied to the RD terminal as shown in Figure 2 is output when the motor is kept
restrained.
Automatic self rotation recovery circuit
If the rotation of the fan motor is forced to stop by any physical power, the driving coil may be burnt as inducing
voltage caused when the motor is running disappears and large current flows to the driving coil.
Therefore, it becomes necessary to provide the fan motor with a circuit to prevent the driving coil from being
burned by detecting the forced stop of the motor rotation from the outside by some method and a circuit to
automatically rotate the motor when it is released from the restraint.
The TA8462F/FG is an IC that has cleared the above problems by the burning preventive automatic return
circuit.
This operation is shown in Figure 1.
The capacitor C
SC
connected to the C
SC
terminal is charged by the charging current I
SL
(6.3 µA Typ.) and its
potential rises as shown below :
V=
1
∫
I dt
C
SC SL
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2006-3-2
TA8462F/FG
Fig.1
Auto mAtic Self Rotation Recovery Circuit Operation
When the motor is rotating, it is charged and discharged repeatedly by trigger pulse but if the motor rotation is
physically restrained, C
SC
discharge by trigger pulse is stopped and the potential further increases. During this
period, current flows continuously to the motor. If V
SC
(OSC potential) reaches V
SCU
(3.5 V Typ.), discharge
starts slowly and at the same time, the output is turned OFF to cur off current flowing to the motor. When the
V
SC
potential reaches V
SCL
(1.5 V Typ.), the output is turned ON to allow current flow to the motor and torque
is generated.
As long as the motor rotation is kept restrained, this operation is repeated and the output is turned ON / OFF at
a ratio of nearly 1 : 5.
By this operation, the motor is heated and cooled and its temperature rise can be suppressed to a certain level.
If the motor is released from the above restraint, the motor is started to run again by the generated torque and
is continuously rotated by the generated trigger pulse.
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2006-3-2
TA8462F/FG
ABSOLUTE MAXIMUM RATINGS
(Ta = 25°C)
CHARACTERISTIC
Output Terminal Breakdown Voltage
Output Current (PEAK)
FG Output Current (PEAK)
RD Output Current (PEAK)
Hall Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
SYMBOL
V
CER
I
O (PEAK)
I
FG (PEAK)
I
RD (PEAK)
V
HM
P
D
T
opr
T
stg
1.5
10
10
RATING
35
(Note 1)
(Note 1)
(Note 1)
UNIT
V
A
mA
mA
mV
mW
°C
°C
300 (Note 2)
735 (Note 3)
−30~85
−55~150
Note 1: t = 0.1 s
Note 2: T
j
=
−25~150°C
Note 3: This value is obtained by 50 × 50 × 1.6 mm PCB mounting occupied in excess of 30% of copper area.
ELECTRICAL CHARACTERISTICS
(Ta = 25°C, V
CC
= 12 V, RV
CC
= 200
Ω,
C
SC
= 1.0 µF)
CHARACTERISTIC
SYMBOL
TEST
CIR−
CUIT
TEST CONDITION
V
CC
= 5 V, RV
CC
= 0
Ω
Output open
Supply Current
I
CC
―
V
CC
= 12 V
RV
CC
= 200
Ω
Output open
I
O
= 0.2 A, T
j
= 25°C
I
O
= 1.0 A, T
j
= 25°C
―
C
SC
= GND
C
SC
= 4 V
V
CC
= 5 V
V
CC
= 5 V
I
d
/ I
c
= t
OFF
/ t
ON
―
―
A: ON
B: ON
A: ON
B: ON
MIN
―
―
―
―
―
―
31
3.0
0.5
―
―
3
―
―
TYP.
8.7
7.7
28
28
0.8
1.15
―
6.2
1.15
3.5
1.5
5
0.35
1.75
MAX
13.0
12.0
35
35
1.0
1.6
35
8.2
1.3
―
V
V
SCL
DR
t
ON
t
OFF
―
―
―
―
―
8
―
―
s
µA
V
V
UNIT
mA
Output Saturation Voltage
Output Terminal Clamp Voltage
Charge Current
Discharge
Current
Automatic
Self
Rotation
Recovery
Circuit
Output OFF
Voltage
Output ON
Voltage
Duty
ON Time
OFF Time
V
SAT
V
CER
I
c
I
d
V
SCU
―
―
―
―
―
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2006-3-2
51单片机
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