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AN2009 데이터시트(PDF) 17 Page - STMicroelectronics

부품명 AN2009
상세설명  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
PDF  39 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
Table 1. Frequency selection
PWM REGISTER (MPWME)
Read/Write
Reset Value: 0000 0000 (00h)
The current reference is provided to the comparator by Phase U, V or W of the PWM Gener-
ator (up to 12-bit accuracy) and the signal from the three compare registers U, V or W can be
output by setting the PWMU, PWMV or PWMW bits.
Bits 3:0 = OT[3:0]: Off Time selection
These bits are used to select the OFF time in sensorless current mode as shown in the fol-
lowing table
SA3
SA2
SA1
SA0
Sampling Frequency
0
0
0
0
50.0 KHz
0
0
0
1
40.0 KHz
0
0
1
0
33.33 KHz
0
0
1
1
25.0 KHz
0
1
0
0
20.0 KHz
0
1
0
1
18.1 KHz
0
1
1
0
15.4 KHz
0
1
1
1
12.5 KHz
1
0
0
0
10 KHz
1
0
0
1
6.25 KHz
1
0
1
0
3.13 KHz
1
0
1
1
1.56 KHz
1
1
0
0
1.25 KHz
1
1
0
1
961 Hz
1
1
1
0
625 Hz
1
1
1
1
390 Hz
7
6
5
4
3
2
1
0
X
PWMW PWMV PWMU
OT3
OT2
OT1
OT0



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