LB1965 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LB1965 Datasheet PDF : 6 Pages
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LB1965M
Truth Table
IN+
IN–
Ct
H
L
H
L
H
H
H
L
H
L
H
H
–
–
L
–
–
–
Rt
RMI
CR OUT1 OUT2 FG
L
H
L
H
L
L
L
H
L
L
H
H
H
L
L
H
L
L
H
L
L
L
H
H
H
H
L
H
H
–
–
–
H
H
H
–
Mode
Full speed
Full speed
Minimum speed
Minimum speed
Low speed
Lockup protection
Sample Application Circuit
12V
D1
R1
390
C3
VIN
FG
R6
B1
R2
2k
OUT1
470k
H
IN–
OUT2
R4
R3
18k
30k
IN+
Ct
B2
GND
Rth RMI CR
C4
TH
C2
R5
39k
10k
0.022 µ
C1
0.47 µ
Noise absorption
capacitor
0.01 to 0.047µF
Unit ( resistance: Ω, capacitance: F)
The above circuit is an example for ambient temperature based speed control using a thermistor.
The thermistor voltage (Rth pin voltage) is multiplied internally by 1.6 and compared to the
voltage at the Ct pin. With the above settings and at Ta = 25˚C, the Rth pin voltage is interrupted
for the interval t off as defined by the equation below. At Ta = 45˚C, because the Rth pin voltage
× 1.6 becomes less than Vct (=1.5V), there is no cut-off interval and the motor is driven with a
duty ratio of 100%. At low temperatures, the thermistor voltage (Rth × 1.6) will rise, but
minimum rotation speed is maintained to a value defined by the RMI pin voltage. Therefore
minimum rotation speed at temperatures below Ta = 25˚C is constant.
VIN–VRth × 1.6
t = –C2⋅R2⋅In (
)
VIN–VCt
No. 6189-3/6
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