M51970 Mitsubishi, M51970 Datasheet - Page 4

• Manufacturer Part Number: M51970
• Description: MOTOR SPEED CONTROL
• Manufacturer: Mitsubishi

(Note 1) How to determine R and C
(Note 2) How to determine R
(Note 3) How to determine C
Tacho-generator output frequency–
Maximum drive current at pin
This constant determines the motor rotating speed. If the motor
rotating speed and the number of poles in the tacho-generator are
assumed to be N and P, respectively, the following relational
expression is generally established. Putting R in the range of
10k
rotating speed.
According to the relation with maximum current I
the following relational expression is generally established. Set I
in such a way that the value cannot exceed the maximum rated
value of the power dissipation of the M51970L when the supply
voltage and temperature arrive at their maximum values.
Select C
required rising characteristics.
10000
50
30
20
10
40
2000
3000
1000
5000
0
500
200
700
300
100
to 500k , select the constant according to the required
Connection resistance characteristics of pin
0
F1
10
20 40 60 80
and C
Connection resistance R (k ) at pin
Current limit resistance R
20 30
current limit resistance characteristics
NP
F2
SC
F1
, C
I
SC
R
=
F
F2
50 70
1.17R C
=
according to the inertia of motor and
100
R
6
F
0.7(V)
1
–
100
R
120 140 160 180
SC
200 300
SC
( )
SC
500
1
200
flowing to pin
1000
1
SC
6
,
MITSUBISHI <CONTROL / DRIVER IC>
MOTOR SPEED CONTROL
M51970L