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AN4144 Datasheet(PDF) 9 Page - STMicroelectronics

Part # AN4144
Description  Voltage mode control operation and parameter optimization
PDF  28 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4144 Datasheet(HTML) 9 Page - STMicroelectronics

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9/28
AN4144
Voltage mode driving
28
The control system generates the phase voltage using a PWM modulation. The outputs
switch between supply voltage VBUS and ground at a fixed frequency. The mean voltage of
the resulting square-wave is adjusted through its duty cycle (on time over square-wave
period ratio) according to Equation 8:
Equation 8
The duty cycle ranges from 0% (the output is always forced to ground) to 100% (the output
is always forced to VBUS).
The BEMF compensation curve is implemented adjusting the PWM duty cycle, so all the
voltage values must be normalized to the supply voltage of the power stage (Figure 3).
Figure 3. BEMF compensation curve
VPH
VBUS
tON
tSW
---------
VBUS DutyCyclePMW
=
=
V
PH /VBUS
Speed
[step/s]
Intersect
speed
Kval
Starting
slope
Final
slope
AM12859v1



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