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LB1668 데이터시트(PDF) 7 Page - ON Semiconductor

부품명 LB1668
상세설명  2-Phase Unipolar Brushless Motor Drivers
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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LB1668, 1668M
No.4944-7/8
Automatic Recovery Circuit C-pin Voltage
Automatic return circuit C pin voltage
1) While the blades are turning, the capacitor is charged with a current of about 3
μA (typical), and C is discharged by
pulses that correspond to the motor speed.
2) When the blades lock, the capacitor is no longer discharged, and the voltage across the capacitor increases. The
output is turned off when that voltage reaches 0.8
× VIN.
3) When the output is turned off, the capacitor is discharged at about 0.44
μA (typical). When the capacitor voltage
falls under VTH2, if the lock state is not yet cleared the capacitor continues discharging until VTH1. (Note that the
output is turned on at this time.)
These operations, i.e. items 2. and 3., are repeated with a ton:toff ratio of about 1 : 6 to protect the motor.
4) If the lock is cleared at the point the capacitor voltage reaches VTH2, motor rotation is started by turning the output
on.
0
1
2
3
4
5
6
VTH2
VTH1
01
t3
23456789
10
11
12
13
14
15
16
17
t2
t1
1
t (s)
Output on
Lock
Output off
Output
on
Rotation
Rotation
Lock released
2
Output off
0
0.4
0.8
1.2
1.6
2.0
0.1
2
3
5
7
1.0
2
0
0.4
0.2
0.6
0.8
1.0
1.2
1.4
10
35
7
2
3
5
7
1.6
Output current, IO –mA
0
2
4
6
8
10
02
4
6
8
10
12
Input current, ICC –mA
2
100
Collector/emitter voltage, VCE –V
VO(sat) – IO
ASO
VIN – ICC
Ta = 80
°C
Single pulse
VIN =
6.7V
300
μs
400
μs
500
μs
IN+ = L


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