LS7262 查看數據表（PDF） - LSI Corporation
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LS7262 Datasheet PDF : 7 Pages
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FIGURE 4. FOUR PHASE OUTPUT DRIVER CIRCUITRY
FIGURE 4A
MOTOR SUPPLY
FIGURE 4B
MOTOR SUPPLY
5
COMMON
Vss
9
BRAKE INPUT
L1
2
O1
O3 4
LS7262
6
O4
8
O6
12
OVERCURRENT
SENSE
L2
L3
L4
Vss
FROM MOTOR
POSITION
SENSOR
Vss
Vss
R1
15
S1
R3
R2
D1
C1
R4
C3
R5
R6
C2
-
+
LS7260
or
LS7262
13
V TRIP
Vss
R7
Vss
C4
14
OSCILLATOR
R8
7260-082697-6
5
COMMON
Vss
L1
9
BRAKE
2
O1
BRAKE
4
O3
LS7262
6
O4
L2
L3
BRAKE
8
O6
O V E R C U R R E N T 12
SENSE
L4
Vss
FIGURE 5
CLOSED-LOOP SPEED CONTROLLER
A closed loop system can be configured by differentiating
one of the motor position sense inputs and integrating only
the negative pulses to form a DC voltage that is applied to
the inverting input of an op-amp. The non-inverting input
voltage is adjusted with a potentiometer until the resultant
voltage at VTRIP causes the motor to run at desired speed.
The R2-C1 differentiator, the R3-D1 negative pulse trans-
mitter and the R4-C2 integrator form a frequency to voltage
converter. An increase in motor speed above the desired
speed causes VTRIP to increase which lowers the PWM
and the resultant motor speed. A decrease in speed lowers
VTRIP and raises the PWM and the resultant motor speed.
For proper operation, both R5 and R6 should be greater
than R4, and R4 in turn should be greater than both R2 and
R3. Also, the R4-C2 time constant should be greater than
the R2-C1 time constant. C3 may be added across R6 for
additional VTRIP smoothing.
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
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