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參數(shù)資料
| 型號(hào)： | PW-82520R3-800Y |
| 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, 3 A, DMA41 |
| 封裝： | DIP-41 |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 219K |
| 代理商： | PW-82520R3-800Y |
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10
Data Device Corporation
www.ddc-web.com
PW-82520R
F-03/06-0
PWM FREQUENCY
The
PWM
frequency
from
the
PW-82520R1/R3
(PW-82520R0) 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:
ERROR AMP IN, ERROR AMP OUT
These are the input and output pins for the error amplifier and
are used for compensation.
COMPENSATION
The PI regulator in the PW-82520R can be tuned to a specific
load for optimum performance. FIGURE 8 shows the standard
current loop configuration and tuning components. By adjusting
R1, R2 and C1, the amplifier can be tuned. The value of R1, C1
will vary, depending on the loop bandwidth requirement.
COMMAND IN+, COMMAND IN- ,
COMMAND GROUND, COMMAND OUT
These are the connection pins for the command amplifier. The
command amplifier has a differential input that operates from a
±4Vdc full-scale analog current command. The command ampli-
fier output signal is internally limited to approximately ±5Vdc to
prevent the amplifier from saturating. The input impedance of the
command amplifier is 50K
.
PW-82520R1, R3:
PW-82520R0:
33.0E-6
16.5E-6
330pF + CEXTpF
The PW-82520R can be used either as a current or voltage
mode controller. When used as a torque controller (current
mode), the input command signal is processed through the com-
mand buffer, which is internally limited to ±5Vdc. The output of
the buffer (command out) is summed with the current monitor
output into the error amplifier. External compensation is used on
the error amplifier, so the response time can be adjusted to meet
the application.
When used in the voltage mode, the voltage command signal is
applied to the command amplifier to control the voltage applied
to the motor. The command amplifier output is coupled into the
error amplifier. The error amplifier directly varies the PWM duty
cycle to control the voltage applied to the motor phase. The
nominal PWM frequency in the voltage mode is 50% with zero
volts applied to the command input. The PWM duty cycle is var-
ied by the voltage applied to the command input according to the
transfer function, 12% per volt applied to the command input. The
duty cycle range of the output voltage is limited to approximate-
ly 5-95% in both current and voltage modes.
COMMAND GND
COMMAND GND is used when the command buffer is used sin-
gle-ended and the COMMAND IN- or COMMAND IN+ is tied to
COMMAND GND.
TRANSCONDUCTANCE RATIO AND OFFSET
When the PW-82520R is used in the current mode, the com-
mand inputs (COMMAND IN+ and COMMAND IN-) are designed
such that ±4Vdc on either input, with the other input connected
to ground will result in ± full-scale current (Continuous Output
Current: (Ioc) - Refer to TABLE 2) flow into the load. The dc cur-
rent transfer ratio accuracy is ±5% of the rated current including
offset and initial component accuracy. The initial output dc cur-
rent offset with both COMMAND IN+ and COMMAND IN- tied to
the ground will be as shown in TABLE 2 (Ioffset) when measured
using a load of 0.5mH and 1.0W at ambient room temperature
with standard current loop compensation (see FIGURE 8). The
winding phase current error shall be within the cumulative limits
of the transconductance ratio error and the offset error.
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
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