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參數(shù)資料
| 型號(hào)： | PWR-82520R3-100 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 8 A, PDMA41 |
| 封裝： | HYBRID, DIP-41 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 187K |
| 代理商： | PWR-82520R3-100 |
10
Data Device Corporation
www.ddc-web.com
PWR-82520R
The PWR-82520R will alternately operate with Hall phasing of
60° electrical spacing. If 60° commutation is used, then the out-
put of HC must be inverted as shown in FIGURES 4 and 5.
FIGURE 4 illustrates the Hall sensor outputs along with the cor-
responding back emf voltage they are in phase with.
HALL INPUT SIGNAL CONDITIONING
When the motor is located more than two feet away from the
PWR-82520R controller in a noisy electrical environment the
Hall inputs require filtering from noise. It is recommended to use
a 1K
resistor in series with the Hall signal and a 2000 pF
capacitor from the Hall input pin to the Hall supply ground pin as
shown in FIGURES 6 and 7.
PHASE A, B, C
These are the power drive outputs to the motor and switch
between VBUS+ Input and VBUS- Input or become high imped-
ance (see TABLE 3).
ENABLE
The Enable input is an active low (L) logic signal that enables or
disables the internal PWM. In the disable mode (H), the PWM is
shut down and the outputs, Phase A, Phase B and Phase C, are
in an "off" state and no voltage is applied to the motor.
TACH OUT
The TACH OUT provides a tachometer signal that is a square
wave clock with a frequency relative to motor speed that is
derived from the three Hall inputs HA, HB, HC. The tachometer
circuitry combines these three signals into a single pulse train as
a 50%-duty-cycle pulse. There are three pulses that occur every
360 electrical degree. The number of pulses per motor revolu-
tion is formulated below:
DIR OUT
The DIR OUT indicates the direction the motor is rotating, clock-
wise (CW) for a HI (open collector), or counterclockwise (CCW),
indicated as a logic LOW (ground).
CURRENT MONITOR OUT
This is a bipolar analog output voltage representative of motor
current. The CURRENT MONITOR OUT will have the same scal-
ing as the COMMAND IN inputs.
SYNC IN
This input, as shown in FIGURE 9, is used to synchronize the
PWM switching frequency with an external clocking device. The
PWM switching frequency can be pulled to up-to 20% faster than
its free running frequency.
PWM IN
PWM comparator inputs used to control the PWM pulse width.
PWM OUT or an external triangular waveform is connected to
this pin.
PWM FREQUENCY
The
PWM
frequency
from
the
PWR-82520R1/R3
(PWR-82520R10) PWM OUT pin will free-run at a frequency of
100KHz ± 5KHz (50KHz ± 2.5KHz). The PWM frequency is user
adjustable from 100KHz (50KHz) down to 10KHz through the
addition of an external capacitor. The PWM triangular waveform
generated internally is brought out to the PWM OUT pin. This
output, or an external triangular waveform generated by the user,
may be connected to PWM IN on the hybrid.
PWM OUT
This is the output of the internally generated PWM triangular
waveform. It is normally connected to PWM IN. The frequency of
this output may be lowered by connecting an NPO capacitor
(Cext) between PWM OUT and COMMAND GND. The PWM fre-
quency is determined by the following formulas:
PWR-82520R1, R3:
PWR-82520R10:
33.0E-6
16.5E-6
330pF + CEXTpF
SYNC PERIOD
0V
5V
50% DUTY CYCLE
FIGURE 9. SYNC INPUT SIGNAL
EXTERNAL PI REGULATOR
10.0 K
R1
4700 pF
C1
1 MEG
ERROR
AMP INPUT
COMMAND
OUT
CURRENT
MONITOR OUT
R2A
10.0 K
R2B
10.0 K
-
+
O
ERROR
AMP OUT
470 pf
R7
100
FIGURE 8. STANDARD PI CURRENT LOOP
WARNING: Never apply power to the hybrid without connect-
ing either PWM OUT or an external triangular waveform to
PWM IN! Failure to do so may result in one or more outputs
latching on.
Tf x 60
Pr
Pr =
x 3 (e.g., 6 pulses/revolution for a 4 pole motor)
P
2
RPM =
P = number of motor poles
Pr = number of pulses per revolution
Tf = Tach output frequency cycles/second
The motor RPM is:
where:
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