LS7560N-TS 查看數據表（PDF） - LSI Corporation
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LS7560N-TS Datasheet PDF : 8 Pages
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FIGURE 3. THREE PHASE CLOSED LOOP FULL WAVE MOTOR CONTROLLER
VM
S2
S1
S3
VR
VM
24
S1
S1
17
OUT1
25
S2
S2
26
S3
S3
27 F/R
16
OUT2
OUT3 15
OUT4 14
21
PWM CNTRL
20
TOP DRV
POL SEL
13
OUT5
12
OUT6
22
BRAKE SEL
10
(+)
23
OVERCURRENT
SENSE
BRAKE
11
(-)
1
SEQ SEL
TACH OUT 5
2
ENABLE
19
VR
ERROR
AMP
7
(-)
8
OUT 6
(+)
18
V SS
28
V DD
9
OSC
RF
4
RC
3
FAULT
*R2
100k
*10k
R3
RT
CT
CS
RS
ROTOR
**
* R1
1M
*C1
0.1µF
* TYPICAL
VALUES
VR
FIGURE 3.
The closed loop motor control
operation is achieved by ap-
plying the Tachometer Output at
Pin 5 into the negative terminal
of the Error Amplifier (Pin 7)
through an R1-C1-R2 integrating
network. The R1-C1 network is
configured as a feedback circuit
around the amplifier. Since the
Tachometer Output has a fixed
positive pulse width, the average
value of the pulse train is directly
proportional to the motor speed.
The desired speed is selected
by applying a voltage at the pos-
itive input (Pin 6) of the Error
Amplifier. The resultant output
voltage of the Error Amplifier is
applied to an internal Compar-
ator along with a ramp waveform
generated by the RC Network at
Pin 9. The PWM signal at the
Comparator output is used to
drive outputs 1 thru 6 and com-
plete the closed loop. For this
configuration, Pin 20, the Top
Driver Polarity Select must be
tied to Ground.
** Switch used to connect the
error amplifier out and (-) input
together when Brake Select input
is low and Brake is applied. The
speed setting selected by R3 also
sets the PWM rate during braking.
VR
19 V R
12
OUT6
13
OUT5
2
ENABLE
R
C
14
OUT4
VM
ERROR AMP(-) 7
19 V R
ERROR AMP 8
OUT
RT
9 OSC
6
ERROR AMP(+)
CT
10
23
BRAKE
(+)
OVERCURRENT
SENSE
11
(-)
FIGURE 4. THREE-PHASE HALF-WAVE MOTOR CONTROLLER
FIGURE 4. This three phase half wave motor controller has no top power tran-
sistor to disconnect the windings from the power supply when the BRAKE is ap-
plied. Instead, a switching transistor is used which will permit braking for a time
determined by the RC time constant. When the capacitor discharges past the
ENABLE input switching point, the outputs will be turned off.
7560N-030906-5
FIGURE 5. OPEN LOOP CONTROLLER
FIGURE 5. In this configuration, the PWM output
duty cycle to the motor drivers is directly pro-
portional to the DC voltage applied to Pin 6, since
Pins 7 and 8 are tied together.
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