M51971 Ver la hoja de datos (PDF) - MITSUBISHI ELECTRIC
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M51971 Datasheet PDF : 13 Pages
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MITSUBISHI <CONTROL / DRIVER IC>
M51971L/FP
MOTOR SPEED CONTROL
Application Circuit Examples
I. When the output impedance of the tacho-
generator is low;
RS
Rf RNF CNF
Rτ
CS
G
23 4
Cτ
5
6 10
M51971L
9
M51971FP
VCC
M
1
7
8
CF1
RF
CF2
M : Motor
G : Tacho-generator
CS : Coupling capacitor for AC amplification
RS, Rf : FG amplifier gain set resistance
RNF, CNF : Filter for noise removal
Rτ, Cτ : Time constant for motor speed setup
CF1, CF2, RF : Phase compensation capacitance and resistance to
stabilize integration and speed control systems
Notes:
1. The signal amplitude of the tacho-generator for set motor
rotating speed must be set to 1 mVP-P or more.
2. FG amplifier gain ≈ 1+ω2GCS2(RS+Rf)2
1+ω2GCS2RS2
ωG : Angle frequency of tacho-generator signal
3. The CS, RS, RNF and CNF values are desirable to be selected as
follows:
(Values omitted)
CS≤4.7µF
2
ωG
≥ CSRS ≥
1
ωG
RNF • CNF ≤
1
ωG
III. When the signal amplitude of the tacho-
generator is large;
R1
G
RNF
CNF
Rτ
Cτ
3
4
5
6 10
2
M51971L
9
M51971FP
1
7
8
CF1
RF
CF2
VCC
M
In the above three examples, the portion over Vf (0.7V) of the
output waveform at pin 3 is clipped in the built-in waveform clip
diode.
IV. When the input waveform is pulse shape
Input pulse signal
Rτ
VCC
Cτ
M
4
5
6 10
M51971L
9
M51971FP
32
17
8
CF1
RF
CF2
Note: The threshold voltage at pin 4 to GND is approx. 1.9V.
II. When the output impedance of the tacho-
generator is high and the signal amplitude is
small;
RS
Rf RNF CNF
Rτ
CS
Cτ
23 4
5
6 10
G1
M51971L
9
M51971FP
7
8
CF1
RF
CF2
VCC
M
V. When turning the motor ON/OFF with control
signals;
Rτ
Cτ
5
6 10
VCC
M
M51971L
9
M51971FP
7
8
CF1
RF Q1
CF2
Control signal
R1
When Q1 is set to ON : Stops the motor.
When Q1 is set to OFF : Controls the motor rotating speed.
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