L6280 datasheet(17/26 Pages) STMICROELECTRONICS

17 / 26 page

DUAL HALF BRIDGE CONFIGURATION (CH1

and CH2)

In dual half bridge configuration the connection

between the output of the high side drivers and

the corresponding low side drivers has to be

made with external jumpers. The output stage

block diagram shown in figure 20 must be substi-

tuted in side the blank boxes in the following

block diagrams. In dual half bridge configuration,

the time sharing strategy is always used.

Figure 20

Tristate left and right

Chopper left, fixed righ

Chopper right, fixed left

Fixed left and right. For these

configurations, see the

corresponding shown in Full

Bridge Configuration paragraph

(Page 14/24).

Chopper left chopper right

As foreseen when in unipolar motor configura-

tion(see Figure 5), the time sharing strategy is

used (see Figure 10), so when the current in left

winding is controlled, the current in right winding

recirculate trough the low side drivers and not

through the sense resistor (Fig. 21).

Figure 21

Tristate left, chopper right

During ON time (Q = LOW) the current flows

through high side driver HSD2, right winding and

sense resistor. During OFF time the current recir-

culate through winding and side drivers LSD2A

and LSD2B (Fig. 22).

Figure 22

Tristate right, chopper left

During ON time (Q = LOW) the current flows

through high side driver HSD1, left winding and

sense resistor. During OFF time the current recir-

culate through the winding and low side drivers

LSD1A and LSD2A (Fig 23).

L6280

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