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PDF M51971L Data sheet ( Hoja de datos )
| Número de pieza | M51971L | |
| Descripción | MOTOR SPEED CONTROL | |
| Fabricantes | Mitsubishi | |
| Logotipo |  |
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MITSUBISHI <CONTROL / DRIVER IC>
M51971L/FP
MOTOR SPEED CONTROL
DESCRIPTION
The M51971 is a semiconductor integrated circuit designed to
control the motor rotating speed.
The built-in FG amplifier with high gain enables to use a wide
range of rotating speed detector (FG detector).
Use of less external parts enables DC motors to be controlled with
high precision.
FEATURES
q Wide range of supply voltage • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4 – 17.5V
qVariation coefficient of supply voltage • • • • • ±0.005%/V (standard)
qLoad variation coefficient • • • • • ±0.01% (standard, full load range)
qTemperature coefficient of rotating speed • • • • 7ppm/˚C (standard)
qBuilt-in high performance FG amplifier
APPLICATION
Motor rotating speed control in floppy disk driver, player, tape
recorder, car stereo, etc.
RECOMMENDED OPERATING CONDITIONS
Supply voltage range • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4 – 17.5V
Rated supply voltage • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9V
Input voltage range at pin 1 • • • • • • • • • • • • • • • • • -0.4 – Vcc Note 1
Input voltage range at pin 4 • • • • • • • • • • • • • • • • • • • • • • • • • • -0.4 – Vcc
Highest setup tacho-generator frequency • • • • • • • • • • • • • • • • 2.5kHz
Minimum trigger pulse width (input pulse at pin 4 )
• • • • • • • • • • 40µs Note 2
Note 1: The linear operation range is -0.4 to +0.4V.
Note 2: This condition applies to both periods: from pulse rising to
pulse falling and pulse falling to pulse rising.
PIN CONFIGURATION (TOP VIEW)
Non-inverted input 1
Inverted input 2
Amplifier output 3
Schmitt input 4
Time constant 5
Stabilized voltage 6
GND 7
Integration capacitance 8
Output 9
Power supply 10
Outline 10P5
Non-inverted input 1
Inverted input 2
Amplifier output 3
Schmitt input 4
Time constant 5
10 Power supply
9 Output
8 Integration capacitance
7 GND
6 Stabilized voltage
Outline 10P2-C
BLOCK DIAGRAM
Amplifier Schmitt
output intput
34
Time constant
5
Integration
capacitance
8
Operational
VLS amplifier
Non-inverted input 1
1.9V
Inverted input 2
Schmitt
comparator
Timer
Constant
current
control
Buffer
amplifier
VLS 1.9V
Over-shoot
prevention
circuit
Power supply 10
Stabilized supply
voltage
9 Output
7
GND
6
Stabilized
voltage
1 page  
Stabilized voltage–Supply voltage
characteristics
3.0
2.8
2.6
2.4
2.2
2.0
0
4 8 12 16 20
Supply voltage VCC (V)
24
Stabilized voltage–Source current
characteristics of pin 6
2.8
VCC=9V
2.7
2.6
0 1234
Source current at pin 6 I 6 (mA)
5
Charging current at pin 8 – Ambient
temperature characteristics
-300
-250
VCC=9V
-200
-150
-100
-50
0
-50 -25 0
25 50 75
Ambient temperature Ta (°C)
100
MITSUBISHI <CONTROL / DRIVER IC>
M51971L/FP
MOTOR SPEED CONTROL
Stabilized voltage–ambient
temperature characteristics
5
VCC=9V
4
3
2
2
1
-50 -25 0 25 50 75 100
Ambient temperature Ta (°C)
Voltage at pin 8 – Input signal
frequency characteristics
4
VCC=9V
3
2
1
0
401.5
402.0
402.5
403.0
Pin 8 – input signal frequency fIN (Hz)
Discharging current at pin 8 – Ambient
temperature characteristics
30
VCC=9V
25
20
15
10
5
0
-50 -25 0
25 50 75 100
Ambient temperature Ta (°C)
5 Page 
MITSUBISHI <CONTROL / DRIVER IC>
M51971L/FP
MOTOR SPEED CONTROL
Hint for designing a stabilized speed control
system
(Method for determining the filter constants (CF1, CF2 and RF) at
pin 8 )
The filter constants at pin 8 must be determined to satisfy the
system stability.
1. Transfer Function of the Motor Speed Control
System
Control circuit
- GC (S)
Motor
GM (S)
Motor speed control system
The motor speed control system is a negative feedback system
including a control circuit and a motor.
As the condition necessary for stable negative feedback, the phase
must be generally 180˚ or less in the frequency area where the
gain of open-loop transfer function (GC(S) • GM(S)) is 1 or more.
2. Transfer Function of Motor
If the motor armature current and angular velocity are assumed to
be la and ωv, respectively, the following equation is established.
∆Tg = KT • ∆la = (SJ+D) • ∆ωv (1)• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Where: Tg : Torque generated in the motor
KT : Proportional constant between the torque genera-
ted in the motor and the armature current
J : Inertia moment of Motor and load
D : Coefficient of viscosity friction
If the number of poles in the tacho-generator is assumed to be P,
the relation of ω = P • ωv exists between tacho-generator angular
frequency ω and motor angular velocity ωv and, therefore, the
motor transfer function (transfer function including motor and
tacho-generator) GM(S) takes a single-pole transfer function as
follows:
GM(S) =
∆ω
∆la
=
P • KT
D • (1+S •
J
)
D
(2)• • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
= KM
1
+
S
ωM
(3)• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Where: KM = P • KT (4)• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
D
ωM = D
J
(5)• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
ωM
log ω
Approximate motor transfer function
3. Transfer Function of Control Circuit Using the
M51971
If input information is assumed to be given continuously (the tacho-
generator frequency is assumed to be infinitely high), the transfer
function from the input at pin 4 to the output at pin 9 is as follows:
GC(M51971)(S)
≡
∆
∆
(output voltage at pin 9
(input frequency at pin
)
4
)
= Tτ ( I 8 C + I 8 d ) x 1 + S/ωF1 • • • • • • • • • • • (6)
CF1 + CF2
S(1 + S/ωF2)
Where : Tτ : Timer pulse width ~~ 1.10 x Rτ x Cτ
l 8 C : Charging current at pin 8
l 8 d : Discharging current at pin 8
ωF1
≡
1
RF • CF2
ωF2 ≡ CF1 + CF2
RF • CF1 • CF2
If the gain of the circuit connected to the back of pin 9 of the
M51971 is assumed to be KCP, transfer function GC(S) for the
entire circuit is as follows:
GC(S) = KCP x Tτ ( I 8 C + I 8 d ) x 1 + S/ωF1 • • • • • • • • • • • • • (7)
CF1 + CF2
S(1 + S/ωF2)
ωF1 ωF2
log ω
Approximate transfer function of control circuit
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet M51971L.PDF ] | |
Hoja de datos destacado
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