L8150 datasheet(19/37 Pages) STMICROELECTRONICS

19 / 37 page

L8150

Operating description

19/37

In case of reverse rotation (CCW), Smooth Drive applies the voltage profiles represented in

the following pictures (Figure 8).

Figure 8.

Smooth Drive Pattern (Reverse)

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.

Rectangular drive pattern (forward)

The diagram (Figure 9) is showing the applied driving pattern in case of applied torque in

forward (continuous blue line) direction, while in case of reverse (continuous red line)

direction, the applied pattern can be found in the following picture (Figure 10); in both

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.

HallU

OutU

OutV

OutW

Phase shift

HallU

OutU

OutV

OutW

Phase shift

HallU

HallV

HallW

OutU

OutV

OutW

HallU

HallV

HallW

HallU

HallV

HallW

OutU

OutV

OutW

HallU

HallV

HallW

HallU

HallV

HallW

OutU

OutV

OutW

HallU

HallV

HallW

OutU

OutV

OutW

HallU

HallV

HallW

HallU

HallV

HallW

HallU

HallV

HallW

OutU

OutV

OutW

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