M51971FP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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产品描述 (功能)

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M51971FP

MOTOR SPEED CONTROL

MITSUBISHI ELECTRIC  

Output voltage range at pin 9 – Supply

voltage characteristics

4

3

2

Ta = -20°C

Ta = 25°C

1

Ta = 75°C

0

4

8

12

16

Supply voltage VCC (V)

MITSUBISHI <CONTROL / DRIVER IC>

M51971L/FP

MOTOR SPEED CONTROL

Buffer amplifier offset voltage –

Voltage characteristics at pin 8

160

VCC=9V

120

80

40

0

–40

0

1

2

3

4

Voltage at pin 8 V 8 (V)

Application Characteristics Example

100

90

10

0%

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

How to determine Rτ 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 Rτ can be

put in the range of 10kΩ – 500kΩ. When using a high resistance,

take care for leak current that may flow on the surface of the

printed circuit board.

NP

≈

1

1.20 • Rτ • Cτ

Tacho-generator output frequency –

Connection resistance characteristics at pin 1

10000

7000

5000

3000

2000

1000

700

500

300

200

Cτ =

0.1µ0F.0470µ.F0220µ.F01µF

4700pF

10 20 30 50 70 100 200 300 500 1000

Connection resistance Rτ (kΩ) at pin 1 Rτ (kΩ)

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