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AN2009 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN2009
Description  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2009 Datasheet(HTML) 8 Page - STMicroelectronics

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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
Figure 5
. Classic sensorless control method
Note: The digital filter of ST7MC allows use of the classical method wiring without an analog
filter. In that case we can remove the virtual neutral network and replace this by just a voltage
divider on the High VOLTAGE BUS. In this situation, sampling at PWM "OFF" is possible only
for PWM applied on the high side switch. Please refer to Application Note AN1946 for more
details on this method.
C
A
B
HV
T4
T1
T0
T3
T2
T5
D0
D2
D4
D3
D5
D1
Low
Side
outputs
High
Side
outputs
ST7FMC
Rotor
position
inputs
M
5V
internal
Vref
Virtual
ground
External
Vref
Level
shifter



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