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參數(shù)資料
| 型號(hào)： | PW-82520R0-860 |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 191K |
| 代理商： | PW-82520R0-860 |
10
Data Device Corporation
www.ddc-web.com
PW-82520/21N
A-11/01-1000
PWM IN
The PWM comparator inputs are 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 PW-82520N1/N3 (PW-
82520N0/21N0) 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 triangle wave-
form. It is normally connected to PWM IN. The frequency of this
output may be lowered by connecting an NPO capacitor (C
EXT
)
between PWM OUT and COMMAND GND.The PWM frequency
is determined by the following formula:
ERROR AMP INPUT, ERROR AMP OUT
These are the input and output pins for the error amplifier and
are used for compensation.
33.0E-6
330pF + C
EXT
pF
PW-82520N1/N3:
16.5E-6
330pF + C
EXT
pF
PW-82520/21N0:
WARNING:
Never apply power to the hybrid without connecting
either PWM OUT or an external triangular waveform to PWM IN!
Failure to do so may result in one or more outputs latching on.
SYNC PERIOD
0V
5V
50% DUTY CYCLE
FIGURE 9. SYNC INPUT SIGNAL
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 with a frequency relative to motor speed and 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 revolution 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.
Tf x 60
Pr
Pr = P
2
The motor RPM is:
RPM =
P = number of motor poles
Pr = number of pulses per revolution
Tf = Tach output frequency cycles/second
where:
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
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