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M51971L Datasheet(PDF) 6 Page - Mitsubishi Electric Semiconductor

Part No. M51971L
Description  MOTOR SPEED CONTROL
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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 6 page
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MOTOR SPEED CONTROL
M51971L/FP
MITSUBISHI <CONTROL / DRIVER IC>
Upper side : Motor speed (FV conversion waveform of tacho-
generator frequency)
Lower side : Supply voltage
Horizontal axis : 20 ms/div
Time constant of motor
≈ 100 ms
Application Characteristics Example
How to determine R
τ and Cτ
These constants determine the motor rotating speed. If the motor
rotating speed and the number of poles of tacho-generator are
assumed to be N and P, respectively, the following relational
expression is generally established. According to the required
rotating speed, select the constant in such a way that R
τ can be
put in the range of 10k
Ω – 500kΩ. When using a high resistance,
take care for leak current that may flow on the surface of the
printed circuit board.
NP
1.20 • R
τ • Cτ
1
4
0
4
8
12
16
Supply voltage VCC (V)
Ta = -20
°C
Ta =25
°C
Ta =75
°C
3
2
1
Output voltage range at pin
– Supply
voltage characteristics
9
160
80
–40
01
2
3
4
VCC=9V
0
40
120
Buffer amplifier offset voltage –
Voltage characteristics at pin 8
Voltage at pin
V
(V)
8
8
10000
1000
Tacho-generator output frequency –
Connection resistance characteristics at pin
Connection resistance R
τ (kΩ) at pin
R
τ (kΩ)
7000
5000
3000
2000
1000
700
500
300
200
10
20 30
50 70 100
200 300 500
1
1
100
90
10
0%




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