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參數(shù)資料
| 型號： | M51971FP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 0.02 A, PDSO10 |
| 封裝： | 10P2-C |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 387K |
| 代理商： | M51971FP |
MOTOR SPEED CONTROL
M51971L/FP
MITSUBISHI <CONTROL / DRIVER IC>
Brief Description on M51971 Operation
Block Description
FG amplifier
The FG amplifier consists of an operational amplifier, revel shift
circuit and diode for waveform clip.
When a DC block capacitor is connected to pin
, output DC
voltage at pin
becomes higher than DC voltage at pin
by VLS
(
≈1.9V≈3VBE).
AC signals centering around the GND can be therefore amplified
easily.
The clipper diode limits the output signal amplitude to
±0.7V (VBE) max. and rapidly charges DC block capacitor with
power supply turned ON.
Schmitt circuit
The Schmitt circuit is a comparator with histeresis, and has ON
level of VLS + 20mV and OFF level of VLS - 20mV.
Timer
The timer generates basic time necessary for controlling the
speed.
This timer is a one-shot circuit triggered with input signals and
generates pulse of 1.1 C
τ Rτ in pulse width.
Constant current control circuit
The constant current control circuit is controlled with output of timer
circuit. The circuit generates, at pin
, source current of I1 –I2
(
≈190A) for the period without one-shot pulse and generates sink
current of I2 (
≈16A) for the period with one-shot pulse.
The ratio of I1 to I2 is characteristic to the IC. The frequency of the
tacho-generator to be set is determined by the one-short pulse
width and this current ratio (I1 / I2
≈12.6).
Where:
TG : Tacho-generator signal frequency (set value)
T
τ : One-short pulse width
Over-shoot prevention circuit
The over-shoot prevention circuit operates when over-shoot is
large in particular, e.g. the motor is suddenly released from lock
status.
Q3 is set to ON for the period of one-short pulse width (T
τ) when
the signal period of the tacho-generator in a motor is shorter than
the one-shot pulse. Generally, electric charge of CF1 is discharged
for this period due to RF CF2 >>T
τ.
Buffer amplifier
The buffer circuit is a voltage follower circuit using an operational
amplifier. The input current is very small (10nA max.) and the
circuit can drive the output current of 20mA.
TG = T
τ x
≈ 1.09 x Tτ
I1–I2
I1
2
1
3
8
1
2
3
Schmitt
input
4
Schmitt
circuit
VLS
1.9V
5
10
7
6
M
9
8
FG amplifier
Non-inverted input
Inverted input
D1
D2
VLS
Operational
amplifier
Amplifier
output
Timer
Logic for timer
E
C
Q1
B
D
C
τ
R
τ
7.5k
comparator
A
A’
Timer output
Over-shoot
prevention signal
Over-shoot prevention circuit
Buffer
100
H
G
Q3
OP
CF1
CF2
RF
206
A
16
A
I2
I1
Q2
Logic for over-shoot
prevention
Constant current
control
To pin
15k
Stabilized voltage
GND
Power
supply
Stabilized
power
supply
1.9V
I
6
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