View M51970_102780.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MITSUBISHI
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.
PIN CONFIGURATION (TOP VIEW)
Time constant Input
1 2 3
FEATURES
qWide range of supply voltage * * * * * * * * * * * * * 2.5 - 18V (-20 - +75C) 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 - +75C) qThe built-in over-shoot prevention circuit keeps the over-shoot low. qDC drive system with minimum RFI
Stabilized voltage (+)GND (-)Power supply Output Current limit resistance Integration capacitance
M51970L Outline 8P5
4 5 6 7 8
APPLICATION
Motor rotating control in the player, tape recorder, etc.
RECOMMENDED OPERATING CONDITIONS
Supply voltage range * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 2.5 - 18V Rated supply voltage * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 9V
BLOCK DIAGRAM
Time constant 1 Integrated capacitance 8
Current limit circuit
7
Current limit resistance
Input
2
Amplifier
Mono multivibrator
Integrator
Current amplifier
6
Output
(+)GND
4
(-)Power supply
5
Stabilized power supply
Overshoot prevention circuit
3 Stabilized voltage
MITSUBISHI
M51970L
MOTOR SPEED CONTROL
ABSOLUTE MAXIMUM RATINGS (Ta=25C unless otherwise noted)
Symbol Vcc I6 I3 PdF KF Topr Tstg Parameter Supply voltage Sink current into 6 pin Source current from 3 pin Power dissipation Thermal derating Operating temperature Storage temperature With printed circuit board mounted (copper foil of 4.5 x 5.5 cm in area, thickness of 35, printed circuit board of 2.0 mm in thickness) Conditions Ratings 18 40 -3 550 5.5 -20 - +75 -40 - +125 Unit V mA mA mW mW / C C C
ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=9V unless otherwise noted)
Symbol VCC ICC VS VTH 2 RIN ISC 6 T Reg-VCC Reg-L TCN Parameter Supply voltage range Circuit current Stabilized output voltage Input threshold voltage Input impedance Output limit current One-shot pulse width Motor speed stability for Vcc Motor speed stability for load Motor speed stability for temperature Test conditions Ta = -20 - +75C Except for output drive current Min. 2.5 3 1.8 -50 4.2 20 375 Limits Typ. - 4.5 2.0 0 7.9 27 395 0.1 0.1 10 Max. 18 8 2.2 50 12 35 415 Unit V mA V mV k mA s % % ppm/C
RSC = 27 R = 75k, C = 22,000pF VCC = 4 - 15V Ta = -20 - +75C
TYPICAL CHARACTERISTICS (Ta=25C unless otherwise noted)
Thermal derating (Maximum rating)
1000 900 Power dissipation Pd (mW) 800 700 600 500 400 300 200 100 0 0 25 50 75 100 125 (1)IC only (2)With printed circuit board mounted (copper foil of 4.5 x 5.5 cm in area, thickness of 35, printed circuit board of 2.0 mm in thickness) (2) (1)
The data on the next page was measured with the following constants in the "Application Circuit Example" given below. R1=100k, R2=30k, CF1=1F, CF2=4.7F, RF=4.7k, R=75k, C=22,000pF, RSC=56, number of tachogenerator poles; 10 poles. Motor speed - ambient temperature characteristics is measured with R and C put out of the temperature test chamber.
Ambient temperature Ta (C)
MITSUBISHI
M51970L
MOTOR SPEED CONTROL
Rotating speed-Supply voltage characteristics
3060 No load
Rotating speed-Motor torque characteristics
3060
Rotating speed N (rpm)
Rotating speed N (rpm)
3055
3055 Vcc = 6V Vcc = 9V
3035
0
10 Supply voltage Vcc (V)
20
3050
0
50 Torque T (g-cm)
100
Rotating speed-Ambient temperature characteristics
3060 Vcc = 9V No load Circuit current Icc (mA)
Circuit current-Supply voltage characteristics
5 Except for sink current to pin 6 4
Rotating speed N (rpm)
3
3055
2
1
3050
-20
0
20
40
60
80
0
0
10 Supply voltage Vcc (V)
20
Ambient temperature Ta (C)
APPLICATION CIRCUIT EXAMPLE
Motor rotating speed control circuit
+ 10 R2 R
+ R1 CF1
RF + CF2
4
8
2 G Tacho-generator 3 M C 1 5 7 Motor M51970L 6
VCC
RSC
MITSUBISHI
M51970L
MOTOR SPEED CONTROL
(Note 1) How to determine R and C This constant determines the motor rotating speed. If the motor rotating speed and the number of poles in the tacho-generator are assumed to be N and P, respectively, the following relational expression is generally established. Putting R in the range of 10k to 500k, select the constant according to the required rotating speed.
NP =
1 1.17R C
Tacho-generator output frequency- Connection resistance characteristics of pin
10000 Tacho-generator output frequency NP (Hz) 5000 3000 2000
1
= C 47 00 pF 01 0. F 0.
1000 700 500 300 200 100
02 2 0. 04 7 F F 0. 1
10 20 30
50 70 100
Connection resistance R (k) at pin 1
(Note 2) How to determine RSC According to the relation with maximum current ISC flowing to pin 6 , the following relational expression is generally established. Set ISC in such a way that the value cannot exceed the maximum rated value of the power dissipation of the M51970L when the supply voltage and temperature arrive at their maximum values.
F
200 300 500 1000
ISC =
0.7(V) RSC
Maximum drive current at pin 6 - current limit resistance characteristics
50
Maximum drive current at pin 6
40
30
20
10
0
0
20 40 60 80 100 120 140 160 180 200 Current limit resistance RSC ()
(Note 3) How to determine CF1, CF2 RF Select CF1 and CF2 RF according to the inertia of motor and required rising characteristics.

▲Up To Search▲

Price & Availability of M51970

	To Download M51970 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .