參數(shù)資料
型號(hào)： TPIC43T01DA
廠商： TEXAS INSTRUMENTS INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO38
封裝： PLASTIC, TSSOP-38
文件頁(yè)數(shù)： 10/29頁(yè)
文件大?。?/td> 463K
代理商： TPIC43T01DA
TPIC43T01, TPIC43T02
THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS
SLIS098 – APRIL 2000
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
digital filter coefficients
The two digital filter coefficients can be set by programming the EEPROM to select the pole and zero for the
digital filter. The pole and zero values are directly proportional to the digital filter sample rate, T(s), and the filter
gain is independent of T(s). The adjustment range of T(s) is from 250 s to 1 ms (see Figure 13). The K1 lead
coefficient value is stored in bits 2–7 of Address 1 as a BCD equivalent of the K1 coefficient. K1 has a range
from 0 to 63, with a default setting of 28. See Table 5 for a typical range of pole and zero frequencies at
T(s) = 500 s. The K2 coefficient value is stored in bits 5–7 of Address 0 (see Table 6 and Figure 14).
The gain of the digital filter is given by the equation:
OUT
+
IN
[128
Z–K2]
0.25
Z–K1 128
Where:
Z represents a delay of one period of the f(s) sampling clock.
The scaling factor of 0.25 in the above equation accounts for the difference in word lengths in the integrator
(10 bits), the filter (17 bits) and the PWM generator (8 bits).
Digital
Integrator
(10-Bit Data Word)
Σ
+
1/Z
Σ
–
K1
K2
+
PWM
Generator
(8-Bit Data Word)
Figure 13. Digital Filter System Diagram
Table 5. Filter Zero and Gain as a Function of K2, Ts = 500
s
K2
K1 = 14 (POLE = 704 Hz)
K1 = 28 (POLE = 483 Hz)
K1 = 56 (POLE = 263 Hz)
K2
ZERO (Hz)
GAIN
ZERO (Hz)
GAIN
ZERO (Hz)
GAIN
127
6.2
0.28
4.8
0.32
3.7
0.45
126
12.4
0.28
9.7
0.32
7.3
0.45
125
18.4
0.42
14.5
0.48
11
0.68
124
24.7
0.28
19.3
0.32
14.6
0.45
123
30.9
0.35
24.2
0.4
18.3
0.56
122
37.1
0.42
29
0.48
21.9
0.68
121
43.3
0.25
33.9
0.28
25.6
0.39
120
49.4
0.28
38.7
0.32
29.2
0.45
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TPIC43T02 制造商:TI 制造商全稱:Texas Instruments 功能描述:THREE-PHASE BRUSHLESS MOTOR RPM CONTROLLERS
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