E-L8150 STMICROELECTRONICS [STMicroelectronics], E-L8150 Datasheet - Page 19

• Manufacturer Part Number: E-L8150
• Description: Brushless motor predriver
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

L8150
In case of reverse rotation (CCW), Smooth Drive applies the voltage profiles represented in
the following pictures
Figure 8.
In case sinusoidal mode cannot be applied, a rectangular pattern will be applied, that is
driving one phase fixed to GND, one phase in tri-state while the other is switching from low
to high with a duty cycle depending on the ADC conversion , max. duty cycle about 95%,
according to the following diagram:
Figure 9.
The diagram
forward (continuous blue line) direction, while in case of reverse (continuous red line)
direction, the applied pattern can be found in the following picture
pictures the meaning of the pattern line is the following: when the line is low, the
correspondent winding is driven continuously low; when the line is high, the winding is
driven with a duty cycle defined from the ADC conversion at a frequency 512 times slower
than the clock. On the other hand, when the line is at middle height the correspondent
phase will be left tri-stated.
HallW
HallW
HallW
HallW
HallW
HallW
HallW
HallW
HallW
Smooth Drive Pattern (Reverse)
Rectangular drive pattern (forward)
HallU
HallU
HallU
HallU
HallU
HallU
HallU
HallU
HallU
OutW
OutW
OutW
OutW
OutW
HallV
HallV
HallV
HallV
HallV
HallV
HallV
HallV
HallV
OutU
OutU
OutU
OutU
OutU
OutV
OutV
OutV
OutV
OutV
(Figure
OutW
OutW
HallU
HallU
HallU
OutU
OutU
OutV
OutV
Phase shift
Phase shift
9) is showing the applied driving pattern in case of applied torque in
(Figure
8).
(Figure
Operating description
10); in both
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