M51970L Datasheet, PDF (1/4 Pages) Mitsubishi Electric Semiconductor – MOTOR SPEED CONTROL

MITSUBISHI <CONTROL / DRIVER IC>
M51970L
MOTOR SPEED CONTROL
DESCRIPTION
The M51970L is a semiconductor integrated circuit designed to
control the motor rotating speed.
Connection of the rotating speed detector (F-G detector) to the
input keeps the motor rotating speed constant with high precision.
Connection of an appropriate power transistor to the output
controls a wide range of DC motors.
FEATURES
qWide range of supply voltage • • • • • • • • • • • • • 2.5 – 18V (-20 – +75˚C)
qVariation coefficient of supply voltage
• • • • • • • • • • • ±0.1% standard (4 – 15V)
qLoad variation coefficient • • • • • • • • • • • • • • • • • • • • • • • • • • ±0.1% standard
qTemperature coefficient of rotating speed
• • • • • • • • • • • • • • ±10 ppm/˚C (standard)
(-20 – +75˚C)
qThe built-in over-shoot prevention circuit keeps the over-shoot
low.
qDC drive system with minimum RFI
APPLICATION
Motor rotating control in the player, tape recorder, etc.
RECOMMENDED OPERATING CONDITIONS
Supply voltage range • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 2.5 – 18V
Rated supply voltage • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 9V
PIN CONFIGURATION (TOP VIEW)
Time constant 1
Input 2
Stabilized voltage 3
(+)GND 4
(–)Power supply ₅
Output 6
Current limit resistance 7
Integration capacitance 8
Outline 8P5
BLOCK DIAGRAM
Time constant
1
Integrated capacitance
8
Current
limit circuit
7 ^{Current limit}
resistance
Input 2
Amplifier
(+)GND 4
(–)Power
supply
5
Stabilized
power
supply
3
Stabilized voltage
Mono
multi-
vibrator
Integrator
Overshoot
prevention circuit
Current
amplifier
6 Output