Sharp LT202A Datasheet
Hall IC
LT202A
■ Features
¡Increasing the efficiency of motor rotation due to cutting
the electric current which doesn't contributing to rotation
¡Combining a GaAs Hall device and a driver IC in a
compact 8-pin SOP package
¡Operation in low magnetic flux density (10mT) due to
applied high sensitive Hall device
¡Built-in protection circuit, alarm output and automatic
restart circuit
GaAs Hall IC for Fan Motor
■ Outline Dimensions
Y
8-0.4±0.1
85
-
X
P 1.27TYP
0
4.4±0.2
6.5±0.4
LT202A
(Unit : mm)
(5.05)
■ Applications
14
5.0±0.2
¡Brushless fan motors
1. Cooling fan motors for personal computers, word
processors, etc.
2. Directly cooling fan motors for cooling fin, PCB, etc.
3. Fan motors for air circulation of temperature sensor in
air conditioner
The section of leads (both sides of package in X-direction) is connected with the terminal of
internal IC. Be careful in connecting other circuits.
■ Absolute Maximum Ratings
Parameter
Supply voltage
Output voltage
Output current (peak)
Output current (continuous)
Coil input voltage
Alarm output sink current
Power dissipation
Oparating temperature
Storage temperature
Soldering temperature*1T
*1 Soldering time : within 10 seconds
Symbol
V
CC
V
O
I
OMAX
I
O
V
IN
I
SINK
P
D
T
opr
T
stg
sol
Conditions
V
CC
=12V
V
CC
=24V
V
CC
=12V
V
CC
=24V
Rating
30
55
750
450
250
150
-0.2 to 0.2
5
400
-20 to +80
-55 to +150
260 ˚C
(Ta=25˚C)
Unit
V
V
mA
mA
mA
mA
V
mA
mW
˚C
˚C
■ Electrical Characteristics
Parameter
Output saturation voltage
Output cut-off current
Operating supply voltage
Supply current
Operating magnetic flux density
Coil input sensitivity
Alarm output saturation voltage
Alarm output leakage current
(Note) Unspecified condition is Vcc=24V.
* In case of oscillating from power supply due to wiring, connect a condenser between 8-pin (Vcc) and 4-pin (GND).
Symbol
V
OUT
I
OC
V
CC
I
CC
B
1
B
2
V
IN
V
SAT
I
LEAK
I
O
=250mA, VCC=12V
V
O
=55V
*
At no-load
Conditions
I
SINK
=4mA
V=28V
0.15±0.05
-
Sensor
X direction : against package
positioning
center -1.4±0.2a
Y direction : against package
1.25±0.2
center 0.0±0.2a
0.650.60
Z direction : from package
surface 0.0±0.2a
Terminal connection
1:Input terminal for phase detection
2:Input terminal for phase detection
3:Condenser terminal for rotation detection
0.1±0.1
4:GND
5:Alarm output
6:Vout
7:Vout
8:Vcc
As for dimensions of tape-packaged
products, refer to page 44 .
(Ta=25˚C)
MIN.
-
8
-
-10
-
15
-
-
TYP.
-
-
-
-
-
-
-
-
-
MAX.
1.5
30
28
13
10
0.5
15
Unit
V
µA
V
mA
mT
mT
mV
-
V
µA
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP devices
shown in catalogs, data books, etc. Contact SHARP in order to obtain the latest device spcification sheets before using any SHARP device.
Hall IC
■ Block Diagram and Timing Chart
LT202A
Constant voltage
+
-
Phase
detection coil
Rotation detector/
automatic restart circuit
1
2
+
-
+
-
GND Alarm output
Fig. 1 Output Saturation Voltage vs.
Ambient Temperature
2.0
VCC=12V
1.8
(V)
OUT
Output saturation voltage V
I
O
=250mA
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-40 8060200-20 40 100
Ambient temperature Ta (˚C)
8
7
6
543
VCC
Motor
Timing chart
Magnetic pole
S(>10mT)
S(>10mT)
N(<-10mT)
N(<-10mT)
Coil input(1:+)
V1-V2=<0
V1-V2>15mV
V1-V2<-15mV
V1-V2>=0
OUT 6
OFF
OFF
OFF
ON
OUT 7
ON
OFF
OFF
OFF
Fig. 2 Output Saturation Voltage vs.
Input Current (Continuous)
2.0
VCC=12V
1.8
(V)
OUT
Output saturation voltage V
T
a
=25˚C
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0 200100 300
Input current(Continuous) IO (mA)
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