m51971 Mitsumi Electronics, Corp., m51971 Datasheet
m51971
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m51971 Summary of contents
Page 1
... 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 Wide range of supply voltage • ...
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... I = -20mA 1V M51971L/FP MOTOR SPEED CONTROL Ratings Unit 18 V – -3 Vcc – 0 Vcc V mA -20 880 (M51971L) mW 450 (M51971FP) 8.8 (M51971L 4.5 (M51971FP) – -20 +75 C – -40 +125 C Limits Unit Min. Typ. Max. 4.0 17.5 V 6.0 3.2 mA 2.44 2.71 2. -3.0 -0.5 -180 -30 nA 2.27 V 1.51 1.89 54 ...
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... Rotating speed–Ambient temperature characteristics 3005 =9V CC 3000 2995 100 -50 Circuit current–Ambient temperature characteristics -50 M51971L/FP MOTOR SPEED CONTROL No load Supply voltage load Outside constant temperature bath 100 ...
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... Input voltage at pin Voltage at pin characteristics of pin -15 -10 Output current at pin Saturetion voltage at pin current characteristics at pin 0.2 Sink current at pin M51971L/FP MOTOR SPEED CONTROL – = 0.2 0.4 0.6 0.8 1.0 1.2 1 (V) 1 – Output current = =0V ...
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... V =9V CC -250 -200 -150 -100 -50 0 -50 - 100 Ambient temperature MITSUBISHI <CONTROL / DRIVER IC> M51971L/FP MOTOR SPEED CONTROL Stabilized voltage–ambient temperature characteristics -50 - 100 Ambient temperature Voltage at pin – ...
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... Tacho-generator output frequency – Connection resistance characteristics at pin 10000 7000 5000 3000 2000 1000 700 500 300 200 10 M51971L/FP MOTOR SPEED CONTROL Buffer amplifier offset voltage – Voltage characteristics at pin Voltage at pin 8 ...
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... Brief Description on M51971 Operation Block Description Amplifier output 3 FG amplifier V 1.9V LS Operational Non-inverted input 1 amplifier Inverted input Buffer 100 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 ...
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... MITSUBISHI <CONTROL / DRIVER IC> Control signal 3 100 200 Control signal To pin 10 To pin 10 To pin 6 100 II. Normal operation to rapid discharging operation A, A’ M51971L/FP MOTOR SPEED CONTROL To pin pin 6 To pin 10 6 7.5k 15k Approx 10 S ...
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... M51971L 9 M51971FP (0.7V) of the f is clipped in the built-in waveform clip M51971L 9 M51971FP GND is approx. 1.9V M51971L 9 M51971FP 8 Control signal ...
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... Note: The selected Hysteresis of the Schmitt circuit must be more than or equal to the ripple current at pin 8 (to prevent chattering). MITSUBISHI <CONTROL / DRIVER IC> VIII. To limit drive current to the motor 1) Control signal 2 M51971L R M51971FP prevent the reduce power loss due to a current limiting resistance ...
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... Discharging current at pin • • If the gain of the circuit connected to the back of pin M51971 is assumed and, therefore, the entire circuit is as follows ( (2) (3) (4) (5) Approximate transfer function of control circuit M51971L/FP ...
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... G *(j )) taking the • • ) (12) G • • • • • • • • • • • • • • M51971L/FP MOTOR SPEED CONTROL / (radian) must be taken into • the following relation must be established. ...
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... M51971L/FP MOTOR SPEED CONTROL 63 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ...