NJU7327 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJU7327 Datasheet PDF : 7 Pages
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NJU7327
Lock detection time (Ton) is given by:
TON
=
C
2
VCL − VID
Ich
[sec]
Where C2 is 0.47uF:
TON
=
0.47
×10
−6
×
2.6
1.26
− 0.6
×10 −6
= 0.76[sec]
Auto Resume Time (Toff) is given by:
TOFF
=
C
2
VCL − VID
Idis
[sec]
Where C2 is 0.47uF:
TOFF
=
0.47
×10
−6
×
2.6
0.42
− 0.6
×10 −6
= 2.33[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
Ct Terminal voltage
Toff
Ton
Motor Lock protection period
Motor Loxked
Returns to normal operation
3. Design of hall element bias resistance (R1 and R2)
Hall amplifier is a differential amplifier.
The common-mode input voltage is between 0.4V and VDD-1V and the input signal must be within the range.
Non-excitation hall bias voltage is to be set at a half of VDD for effective use of common-mode input voltage range.
Therefore the same value of hall bias resistors is selected for R1 and R2.
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