NJM2640 データシートの表示（PDF） - Japan Radio Corporation
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NJM2640 Datasheet PDF : 7 Pages
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NJM2640
Lock detection time (Ton) is given by:
TON
= C2Vch −Vcl [sec]
Ic
Where C2 is 0.47uF:
TON
=
0.47
×10
−6
×
2.5 − 0.7
3.8 ×10 −6
= 0.22[sec]
Auto Resume Time (Toff) is given by:
TOFF
=
C2Vch −Vcl
Idc
[sec]
Where C2 is 0.47uF:
TOFF
=
0.47
×10−6
×
2.5
0.75
− 0.7
× 10 − 6
= 1.13[sec]
In actual application, Lock detection time (Ton) is affected by the mechanical time constant of a motor.
Therefore, constant start up must be confirmed in actual evaluation taking operating variations
(i.e.Temperature, Voltage change and so on) in consideration.
A typical value of C2 is either 0.47uF or 1uF depending on a motor.
Hall input
Motor output
ton
tOFF
Ct Teminal voltage
LATeminal voltage
High
Motor Lock protection period
Motor Locked
Returns to normal operation
Lock Protection
Lock Alert Out (LA: Pin 3) is a open collector output and R3 is a pull up resister. A typical value of R3 is
10kΩ.
It must be noted that Lock Alert Out stays a H state during few hundred milliseconds from power up as
shown in the picture below.
Power supply
LA terminal output
Hundreds of millimeter second
-5 -
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