M51971L データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M51971L

MOTOR SPEED CONTROL

MITSUBISHI ELECTRIC  

MITSUBISHI <CONTROL / DRIVER IC>

M51971L/FP

MOTOR SPEED CONTROL

VI. To switch the set rotating speed in stages with

control signals

6

M51971L

M51971FP

5

7

Control Control

signal 1 signal 2

Rτ1

Rτ2

Rτ3

Cτ

VIII. To limit drive current to the motor

1)

Rτ

VCC

Cτ

5

6 10

M IM

M51971L

M51971FP

R1 200Ω

9

Q1

7

8

Q2

CF1

RF

CF2

RSC

VII. Limiting output current at pin 9 to prevent the

IC from heating

Rτ

Cτ

5

6 10

M51971L

M51971FP

7

8

CF1

RF

CF2

RSC

9

VCC

M

Q1

I 9 max = V 9 max

R 9 + RSC

: V 9 max ~~ 3.2V, R 9

~~ 100Ω

(See the Electrical Characteristics and Typical Characteristics.)

VBE2

IMmax = RSC

~~

0.7V

RSC

2) To reduce power loss due to a current limiting resistance

Rτ

Cτ

5

6 10

M51971L

M51971FP

7

8

CF1

RF

CF2

R1 200Ω

9

Q2

IMmax = (VBE2 – VBE1 x

R3

R2 + R3

) / RSC

~~

0.7V x R2

(R2 + R3) • RSC

VCC

M IM

Q1

R2

R3

RSC

IX. Frequency comparator

Input/output transmission characteristics

Frequency input

VCC

Rτ

4 10 6

5

M51971L

M51971FP

7

8

CF

R’τ

R’τ > 2Rτ

Cτ

Output

9

Schmitt circuit

fTH2

fTH1

Input frequency

Note: The selected Hysteresis of the Schmitt circuit must be more than or

equal to the ripple current at pin 8 (to prevent chattering).

fTH1 ~~

1

1.20 x Rτ • Cτ

fTH2 ~~

1

1.09 x Rτ // R’τ x Cτ x In

3(Rτ + R’τ)

R’τ – 2Rτ

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