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M51971L Datasheet(PDF) 1 Page - Mitsubishi Electric Semiconductor

Part No. M51971L
Description  MOTOR SPEED CONTROL
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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MOTOR SPEED CONTROL
M51971L/FP
MITSUBISHI <CONTROL / DRIVER IC>
9
10
PIN CONFIGURATION (TOP VIEW)
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
qWide 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
•• •• •• •• ••• •• •• ••
-0.4 – Vcc Note 1
Input voltage range at pin
•• •• •• •• ••• •• •• •• ••• •• •• ••
-0.4 – Vcc
Highest setup tacho-generator frequency •• •• •• •• ••• •• •• • 2.5kHz
Minimum trigger pulse width (input pulse at pin
)
• • • • • • • • • •
40
µs 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.
Outline 10P5
1
4
3
2
5
6
7
8
Schmitt input
Non-inverted input
Inverted input
Amplifier output
Time constant
Stabilized voltage
GND
Integration capacitance
BLOCK DIAGRAM
1
4
4
Output
Power supply
10
7
8
9
1
4
3
2
6
5
Outline 10P2-C
Non-inverted input
Inverted input
Amplifier output
Schmitt input
Time constant
Power supply
Output
Integration capacitance
GND
Stabilized voltage
1
2
10
7
6
Non-inverted input
Inverted input
Power supply
Operational
amplifier
VLS
1.9V
Amplifier
output
Schmitt
intput
Stabilized supply
voltage
3
4
Schmitt
comparator
5
Time constant
Integration
capacitance
8
VLS
1.9V
9
Over-shoot
prevention
circuit
Timer
Constant
current
control
Buffer
amplifier
Output
GND
Stabilized
voltage




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